Info
Warning
Danger

Study Resources (Statistics)

  True / False Questions  1. We can apply non-parametric tests to problems involving interval or ratio data. 2. We can apply parametric tests, such as the t test, to ordinal or ranked level of measurement. 3. The Kruskal-Wallis one-way analysis of variance by ranks is especially appropriate to test whether three or more population means are.
7 Views
View Answer
  Essay Questions  126. If we wanted to see if tossing a die (a cube with the sides numbered one through six) had an equal chance of showing each side or number, what statistical test should be applied? 127. If an employee wanted to investigate the relationship between performance rating and gender, what type of.
3 Views
View Answer
  101. A soap manufacturer is experimenting with several formulas of soap powder. Three of the formulas were selected for further testing by a panel of homemakers. The ratings for the three formulas are as follows:  The soap manufacturer decided to use the Kruskal-Wallis test. What is the null hypothesis? ___________________________________ 102. A soap manufacturer.
1 Views
View Answer
  True / False Questions  1. Statistical decision theory is defined as the collection of techniques a decision maker can apply to choose the best alternative action. 2. In decision making, if there are one or more unknown factors, then the decision is made under conditions of uncertainty. 3. A decision maker usually has a choice among.
9 Views
View Answer
  31. The maximin strategy is a __________ strategy for decision making.   32. The maximax strategy is an ________ strategy for decision making.   33. In decision theory, _______ create uncertainty in selecting an alternative.   34. A decision-maker selects a course of action called an ________________.   35. __________________ examines the effect that changes in the probabilities for states of nature have.
2 Views
View Answer
    121. A major distributor buys shoes from a supplier. The distributor randomly samples the shoes to inspect for quality. The distributor's specifications state that a delivery of 100 pairs of shoes will be accepted only if the number of defective pairs of shoes in a sample of 10 pairs is two.
2 Views
View Answer
  91. In the Kruskal-Wallis test for the following data, what is the sum of the ranks for sample one?   A. 61.5B. 163C. 6D. 253 92. In the Kruskal-Wallis test for the following data, what are the degrees of freedom?   A. 5B. 2C. 16D. 15 93. In the Kruskal-Wallis test for the following data, what is the sum of the ranks for sample three?   A. 57B. 80C. 4D. 210 94. In a Kruskal-Wallis.
1 Views
View Answer
  31. The Wilcoxon Rank-Sum method tests for equality between two _____________ populations.   32. The Wilcoxon Rank-Sum uses the _____________ as the test statistic.   33. The Wilcoxon Rank-Sum compares two populations based on the sum of the ________.   34. The Kruskal-Wallis Test is the nonparametric analogy to a one-way ________.   35. In the Kruskal-Wallis method, testing for differences among populations.
2 Views
View Answer
  41. A one-tailed sign test is used to test for differences between two populations at the 0.10 level of significance. There were 9 pluses and 5 minuses. What is the decision regarding the null hypothesis? A. Fail to reject the null hypothesis.B. Reject the null hypothesis.C. Neither reject nor fail to reject the null hypothesis.D. Should.
1 Views
View Answer
  81. Recently, students in a marketing research class were interested in the driving behavior of students. Specifically, the marketing students were interested if exceeding the speed limit was related to social activity. They collected the following responses from 100 randomly selected students:  What is the value of the test statistic? A. 83.67B. 9.89C. 50D. 4.94 82. Recently, students in.
2 Views
View Answer
    21. In what decade were the concepts of statistical quality control developed? _________   22. One of the most important concepts of statistical process control is that no two products are ________________.   23. A statistical quality control chart that is out-of-control shows what type of variation? _______   24. Acceptance sampling and control charts may be based on measurements.
3 Views
View Answer
  41. A maximin strategy will always choose the act or alternative that A. maximizes the expected monetary value.B. minimizes the maximum regret or opportunity loss.C. maximizes the potential payoff regardless of the state of nature.D. guarantees a payoff for any state of nature. 42. A minimax regret strategy will always choose the act or alternative that A. maximizes the expected.
3 Views
View Answer
  111. In a market research study involving eleven people, seven preferred Product X, three preferred Product Y and one expressed no preference. A sign test is selected using the 0.05 level of significance. What is the decision rule if the test statistic is the number of people preferring Product X? 112. In a.
2 Views
View Answer
  71. The following are the ratings (0 to 4) given by 12 individuals for two possible new flavors of soft drinks.  Wilcoxon rank-sum is to be used.What is the z-test statistic? A. - 0.3464B. 0.3464C. 8.6602D. 0.2807 72. The following are the ratings (0 to 4) given by 12 individuals for two possible new flavors of soft drinks.  Wilcoxon rank-sum.
1 Views
View Answer
  121. We are interested in knowing if the following frequency distribution is normally distributed. The mean and standard deviation of the data is 600 and 160.  If the distribution was normally distributed, what is the probability that an observation would be a member of the "800 up to 1000" class? 122. We are interested.
2 Views
View Answer
    41. Samples of 200 parts were taken every day and the number of defectives was counted. What are the upper and lower limits for the percent defective chart?   A. 0.02 and 0B. 0.2970 and 0C. 0.0297 and 0D. 0.0497 and 0 42. A subassembly is inspected and the number of defects recorded. A new group of assemblers began.
1 Views
View Answer
  11. The Wilcoxon rank-sum test includes a variable, W. It is the sum of the observed values from the larger sample. 12. Spearman's rank-order correlation coefficient may assume a value from -1 to +1. 13. A Spearman's rank-order correlation coefficient of 0.91 indicates a very weak relationship. 14. The alternate hypothesis states that the correlation between two.
3 Views
View Answer
    81. Random samples of 4 items are selected from a manufacturing process at regular intervals and a certain quality characteristic is measured. After 25 samples,? X = 15,350 and ? R = 411.4To construct a mean chart what is the value for the center line? A. 15,350B. 614C. 411.4D. 3837.5 82. Random samples of 4 items are selected.
1 Views
View Answer
  11. Maximizers advocate a maximin strategy. 12. Optimists advocate a maximin strategy. 13. Optimists advocate a maximax strategy. 14. If the expected value of stock purchases under conditions of certainty is $1,900 and the expected value of stock purchases under conditions of uncertainty is $1,840, then the $60 difference is called the expected value of perfect information. 15. Sensitivity.
4 Views
View Answer
    101. An airline is investigating the causes of lost bags. The following table of data was collected over the last six months.  What percentage of bags is lost because of "conveyer jams"? 102. An airline is investigating the causes of lost bags. The following table of data was collected over the last six months.  What.
1 Views
View Answer
  True / False Questions1. A fishbone diagram is used to determine if a process is out of control. 2. One purpose of quality control is to reduce the costs associated with producing and delivering poor quality goods and services. 3. There are two general types of causes of variations in manufacturing and service processes: chance.
8 Views
View Answer
    31. What chart portrays the number of defects per unit? ____________   32. What is the "in control" region of a control chart called? ____________________   33. What causes of variation cannot be entirely eliminated? _____________   34. What variation is due to slight changes in materials or process conditions and is random in nature? ________________   35. A Pareto chart is typically.
2 Views
View Answer
  11. For a goodness-of-fit test, the following are possible null and alternate hypotheses:H0: Sales are uniformly distributed among the five locations.H1: Sales are not uniformly distributed among the five locations. 12. For the goodness-of-fit test, the use of the chi-square statistic would be permissible in the following problem.   13. In the goodness-of-fit test, the chi-square.
4 Views
View Answer
  51. For people released from prison, the following table shows their adjustment to civilian life and place of residence.  What is the critical value for this contingency table at the 0.01 level of significance? A. 9.488B. 2.070C. 11.345D. 13.277 52. The educational level and the social activity of a sample of executives follow.  What does the expected frequency for the.
2 Views
View Answer
  21. When all the facts are known in a decision-making situation, it can be said that the decision was made under conditions of _____________.   22. In decision theory, an uncertain future outcome is called a: ____________________   23. What is the average return for a particular act or decision alternative called? ____________________   24. What is the potential loss.
1 Views
View Answer
  51. A two-tailed test of hypothesis was conducted and 60 values were above the median. The computed z = 1.90. At the 0.05 level, what is the decision regarding the null hypothesis? A. Reject the null hypothesis with a 0.05 Type I error rate.B. Fail to reject the null hypothesis.C. Reject the null hypothesis with.
1 Views
View Answer
  111. A survey of the opinions of property owners about a street widening project was taken to determine whether the property owners' opinions were related to their property's distance (front-footage) from the street. A randomly selected sample of 100 property owners was contacted and the results are shown below.  What is the.
3 Views
View Answer
  21. What is the degree of freedom for a chi-square goodness-of-fit test? ____________________________   Short Answer Questions  22. When testing a goodness-of-fit null hypothesis, and there are extremely large differences between observed and expected frequencies, what decision should be made? ____________ Fill in the Blank Questions  23. In a contingency table, the decision to reject the null hypothesis.
7 Views
View Answer
  91. To test for a normal distribution of a frequency distribution with 5 classes, we compute probabilities for each class based on a A. standard normal distribution.B. chi-square distribution.C. student's t distribution.D. F distribution. 92. A grouped frequency distribution has a mean of 100 and a standard deviation of 20. The class limits for one class are 50.
2 Views
View Answer
  71. A recent study of the relationship between social activity and education showed the following results.  The appropriate test to analyze the relationship between social activity and education is: A. Regression analysisB. Analysis of varianceC. Contingency table analysisD. Goodness-of-fit 72. A recent study of the relationship between social activity and education showed the following results.  The appropriate test statistic for.
7 Views
View Answer
  True / False Questions  1. Nonparametric tests require no assumptions about the shape of the population distribution. 2. The claim that "male and female students at Coastal Carolina University prefer different parking lots on campus" is an example of a chi-square null hypothesis. 3. The chi-square test statistic used in a goodness-of-fit test has k-1 degrees.
13 Views
View Answer
  128. Why are the goodness-of-fit hypothesis tests comparing observed data to a normal distribution important in the field of statistics? Provide an example. 129. What does a significantly large chi-square statistic infer about the differences between the observed and expected frequencies in a goodness-of-fit test?     .
2 Views
View Answer
    61. In a control chart, expected variation is defined by the A. standard deviation.B. standard error of the distribution.C. only upper control limits.D. upper and lower control limits. 62. Control charts are used to determine if a process is A. in or out of control.B. measurable.C. fixable.D. testable. 63. The Quality Assurance Department selected a sample of 12 printed circuit boards and tested them. The.
1 Views
View Answer
  Essay Questions  126. The manager of a restaurant inspects a delivery of steaks based on the expectation that each steak weighs eight ounces. Is this an example of acceptance sampling or statistical process control? Explain why. 127. The manager of a restaurant measures several variables important to quality. These include: food temperature, time to.
3 Views
View Answer
  81. To test the hypothesis, the Wilcoxon Signed-Rank test uses a A. z-statistic.B. a T test statistic.C. Chi-square statistic.D. a student's t-statistic. 82. Using the following data, the Wilcoxon Signed-Rank hypothesis test is used to test the hypothesis that there is no difference between the before and after populations. What are the sum of the ranks?   A. 4 and 6B. 5C. 17D. 6.
1 Views
View Answer
    91. A new machine is set or calibrated to fill tubes of toothpaste at precisely 6.75 ounces. Then, once the machine is running, a sample of 6 tubes is taken every three hours and weighed with the following results:  The measurement of quality is based on A. An attributeB. A variableC. A scaleD. A chart 92. Random samples of.
1 Views
View Answer
  61. For a chi-square test involving a contingency table, suppose the null hypothesis is rejected. We conclude that the two variables are A. linear.B. curvilinear.C. not related.D. related. 62. Which of the following can be used to test the hypothesis that two nominal variables are related? A. a contingency table.B. a chi-square table.C. an ANOVA table.D. a scatter diagram. 63. When determining how well an.
2 Views
View Answer
  61. Which of the following values of Spearman's (rho) indicates the strongest relationship between two variables? A. -0.91B. -0.05C. +0.64D. +0.89 62. A data set has six values: 10, 12, 21, 26, 26, and 26. What ranks would be assigned to 26? A. 4, 5, 6B. 4, 4, 4C. 5, 5, 5D. 5.5, 5.5, 5.5 63. For a given set of twelve ranked data values,.
1 Views
View Answer
    71. A new machine is set or calibrated to fill tubes of toothpaste at precisely 6.75 ounces. Then, once the machine is running, a sample of 6 tubes is taken every three hours and weighed with the following results:  What is the value of A2, the control limit factor for averages? A. 0B. 1C. 0.577D. 0.483 72. A new.
1 Views
View Answer
  31. For contingency table test of independence, the formula to compute the degrees of freedom is ___________________________________   Short Answer Questions  32. If the computed value of a chi-square statistic is greater than the critical value, what is the decision regarding the null hypothesis? _________ Fill in the Blank Questions  33. To test a hypothesis that a frequency.
5 Views
View Answer
  21. In testing the significance of Spearman's rank-order coefficient, what is the null hypothesis? _______________ 22. In testing the significance of Spearman's rank-order coefficient, what is the alternate hypothesis? ______________________ Fill in the Blank Questions  23. What is the value of the Spearman rank-order correlation coefficient that indicates no association between the two variables? _____   24. A nonparametric.
2 Views
View Answer
  41. A question has these possible choices—excellent, very good, good, fair and unsatisfactory. How many degrees of freedom are there using the goodness-of-fit test to the sample results? A. 0B. 2C. 4D. 5 42. What is the critical value at the 0.05 level of significance for a goodness-of-fit test if there are six categories? A. 3.841B. 5.991C. 7.815D. 11.070 43. What is the decision regarding.
6 Views
View Answer
    51. Cappelli Inc. designs and manufactures women's apparel using material from various mills. Their acceptance sampling plan states that 20 two inch squares of the incoming material must be carefully checked. If 3 or less squares reveal imperfections, the lot is accepted. What is the probability that an incoming lot from.
2 Views
View Answer