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Study Resources (Statistics)

  21.{Student's Final Grade Narrative} Interpret the coefficient b3.     Real Estate Builder   A real estate builder wishes to determine how house size is influenced by family income, family size, and education of the head of household. House size is measured in hundreds of square feet, income is measured in thousands of dollars, and.
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  16.{Student's Final Grade Narrative} Does this data provide enough evidence to conclude at the 5% significance level that the final grade and the number of skipped lectures are linearly related?     17.{Student's Final Grade Narrative} Does this data provide enough evidence at the 5% significance level to conclude that the final grade.
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    82.If the value of the Durbin-Watson statistic d is small (d < 2), this indicates a(n) ____________________ (positive/negative) first-order autocorrelation exists.     83.If the value of the Durbin-Watson statistic d is large (d > 2), this indicates a(n) ____________________ (positive/negative) first-order autocorrelation exists.     84.To use the Durbin-Watson test to test for positive first-order.
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  42.Multicollinearity is present if the dependent variable is linearly related to one of the explanatory variables.     43.Multicollinearity affects the t-tests of the individual coefficients as well as the F-test in the analysis of variance for regression because the F-test combines the t-tests into a single test.     44.Because of multicollinearity, the t-tests of.
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  31. Which of the following sampling plans use random methods of selections?a. Simple random samplingb. Stratified samplingc. Cluster samplingd. Systematic Samplinge. All of these32. A pharmaceutical company interested in measuring how often physicians prescribe a certain drug has selected a simple random sample from each of two groups: M.D. (medical.
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  21. Which type of sampling would primarily be used in exploratory research studies where there is no intention of making statistical inferences from the sample to the population?a. probability samplingb. nonprobability samplingc. simple random samplingd. cluster samplinge. stratified sampling22. Which of the following is an example of nonsampling errors?a. Errors.
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  21. What is the median? ____________________ (Remove all commas from your answer before submitting). 22. What is the first quartile? ____________________ (Remove all commas from your answer before submitting). 23. What is the range of these prices? 24. What is the mid-range? 25. Consider the following sample data: 6, 10, 4, 3, 7, 9, 21, and.
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TRUE/FALSE 1. True or FalseCharacteristics of the population are referred to as parameters, while characteristics of the sample are referred to as statistics. 2. True or FalseWhen a distribution has more values to the left and tails to the right, we say it is skewed negatively. 3. True or FalseWhen a distribution has.
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  11. Which of the following variables probably could be measured in an observational study of airline travelers?a. The brand of coffee they drink at home.b. The occupation of the traveler.c. How many frequent traveler miles they have earned.d. The gender of the traveler.e. The total number of bags taken on.
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TRUE/FALSE 1. True or FalseStatistics can be used as a descriptive tool for expressing information relevant to business. 2. True or FalseStatistics can be used as an inferential device for using sample findings to draw conclusions about a population. 3. True or FalseAn economics student searches the Survey of Current Business for gross.
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  SHORT ANSWER 1. Find the mean, median, mode, and range for these data values: 14, 12, 11, 11, 16, 18, 11, and 10. Mean = ____________________ Median = ____________________ Mode = ____________________ Range = ____________________ 2. Compute the mean, median, and mode from these data: 1.2, 1.6, 2.1, 1.2, 1.8, 2.2, 1.2, 1.6, 1.8, and 2.0. Mean.
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  1. Measures of ____________________ are numbers that describe typical values in the data. 2. Measures of ____________________ are numbers that describe the scatter of the data or the extent to which the data values are spread out. 3. The coefficients of correlation and determination are two statistical measures of ____________________. 4. The mean.
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1. True or FalseRegardless of your eventual career destination, whether it is accounting or marketing, finance or human resource management, you will find statistics relevant to your field. 2. True or FalseBusiness statistics can be described as the collection, summarization, analysis,and reporting of numerical findings relative to a business decision or.
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  6. Between 1980 and 1999, constant dollar spending on non-residential construction in the United States (in billions of dollars) was as follows: Year 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989Spending 27.6 30.8 37.8 40.0 36.9 36.0 38.4 35.7 34.7 35.3 Year 1990 1991 1992 1993 1994 1995 1996 1997.
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    62.A practical way to identify multicollinearity is through the examination of a correlation ____________________ that shows the correlations of each variable with each of the other variables.     63.A high correlation between two independent variables is an indication of ____________________.     64.Three predictor variables are being considered for use in a linear regression model..
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  ESSAY 1. A friend has constructed the following frequency distribution of test scores in his business statistics class:Score Number of Students40 and below 240 – 50 650 – 60 860 – 70 1370 – 80 1180 – 90 590 and above 4 He asks for your feedback. What advice would you give.
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  MULTIPLE CHOICE 1. Which of the following statements describe secondary external data?a. A manufacturer of semiconductors experiments with different designs and records the data.b. A mail order company conducts a telephone survey among recent purchasers.c. A presidential candidate commissions a political survey organization to establish the percent of persons favoring her.
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  MULTIPLE CHOICE 1. Which of the following is not a measure of central tendency?a. Mean absolute deviationb. Arithmetic meanc. Weighted meand. Mediane. Mode  2. Which of the following is not a measure of dispersion?a. Mean absolute deviationb. Quantilesc. Weighted meand. Rangee. Standard deviation.  3. The measure of central tendency that is least affected.
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  26.{Real Estate Builder Narrative} When the builder used a simple linear regression model with house size as the dependent variable and education as the independent variable, he obtained an R-square value of 23.0%. What additional percentage of the total variation in house size has been explained by including family size.
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  11. True or FalseExploratory research can be of a qualitative nature. 12. True or FalseRegarding causal studies, it should be pointed out that statistical techniques alone can prove causality. 13. True or FalseA sample consisting of firms or persons who have engaged in a specific behavior or activity are said to be.
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  SHORT ANSWER 1. A physician takes the following sample of blood cholesterol levels form a group of volunteers (one reading per volunteer): 221, 202, 216, 227, 232, 218, 225, 234, 203, 247.a. In what form, if any are these data organized?b. Construct a frequency distribution, with class intervals of 10 points.
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  11. When variables are used as the basis for a cross-tabulation, what scale of measurement must they represent? 12. Define and give a real or hypothetical example of simple tabulation. 13. Define and give a real or hypothetical example of cross-tabulation. 14. A recent Wall Street Journal survey found that 523 Democrats and.
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    52.Which of the following statements regarding multicollinearity is not true? a.It exists in virtually all multiple regression models. b.It is also called collinearity and intercorrelation. c.It is a condition that exists when the independent variables are highly correlated with the dependent variable. d.All of these choices are true.       53.When the independent variables are correlated with.
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  11. The cumulative frequency distribution describes thea. number of observations that fall within each class.b. proportion of observations that fall within each class.c. number of observations that are within or below each of the classes.d. proportion of observations that are within or below each of the classes.e. None of these.
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  11. Identify each of the following studies as either descriptive statistics or inferential statistics:A) Examine the heights of a sample of 50 NBA basketball players to see if the average height of all NBA basketball players is 75 inches.B) Post the average midterm score for the statistics class.C) Estimate the.
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  NUMERIC RESPONSE 1. The following stem-and-leaf output has been generated by Minitab. How many values are positive? 2. The grades on a chemistry exam for a sample of 40 students are as follows: Estimate the percentage of grades that are between 80 and 90. 1. A cumulative frequency distribution lists the number of observations that.
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  11. Shares of stock owned by seven stockholders represent a percentage of the outstanding shares. The data are shown below: Stockholder PercentageA 0.7%B 0.7%C 17.8%D 5.1%E 4.3%F 1.8%G 2.1% If the mean is 4.63 and the standard deviation is 5.594, what percentage of the measurements would you expect to fall between -3.748.
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  36.{Real Estate Builder Narrative} Suppose the builder wants to test whether the coefficient on education is significantly different from 0. What is the value of the relevant t-statistic?     37.{Real Estate Builder Narrative} What is the value of the calculated F-test statistic that is missing from the output for testing whether the.
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TRUE/FALSE 1. True or FalseRaw data are converted to frequency distributions and visual displays that provide us with a “big picture” of the information collected. 2. True or FalseThe appropriate methods for representing the data do not depend on whether the variable of interest is quantitative or qualitative. 3. True or FalseContingency tables.
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  21. True or FalseIn cluster analysis, the individuals or objects are categorized into different groups where the members of each group tend to be different. 22. True or FalseA statistic is a characteristic of a sample such as the sample mean or sample standard deviation. 23. True or FalseA census can be.
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  16. Use the frequency distribution below to determine the mean and standard deviation of this sample. = ____________________. s = ____________________. 17. Compute the sample mean and sample standard deviation from the following set of grouped data: = ____________________. s = ____________________. 18. Using the grouped data below, determine the population mean and population standard deviation: =.
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  MULTIPLE CHOICE 1. Which of the following statements involve descriptive statistics as opposed to inferential statistics?a. The Alcohol, Tobacco and Firearms Department reported that Houston had 1,791 registered gun dealers in 1997.b. Based on a survey of 400 magazine readers, the magazine reports that 45% of its readers prefer double column.
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  31.{Real Estate Builder Narrative} What minimum annual income would an individual with a family size of 9 and 10 years of education need to attain a predicted 5,000 square foot home?     32.{Real Estate Builder Narrative} One individual in the sample had an annual income of $100,000, a family size of 10,.
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    72.Large values of the Durbin-Watson statistic d (d > 2) indicate a positive first-order autocorrelation.     73.If the value of the Durbin-Watson statistic, d, satisfies the inequality dL ? d ? dU, where dL and dU are the critical values for d, then the test for positive first-order autocorrelation is inconclusive.     74.If the.
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  MATCHING Match the terms with the definitions. (Note: there are more definitions than terms)a. a characteristic of the populationb. indicates that a person or object belongs in a categoryc. the entire set of people or objects of interestd. the arithmetic average of the datae. a measurement scale with an absolute zerof..
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  11.{Life Expectancy Narrative} Interpret the coefficient b2.     12.{Life Expectancy Narrative} Interpret the coefficient b3.     Student's Final Grade   A statistics professor investigated some of the factors that affect an individual student's final grade in her course. She proposed the multiple regression model , where y  is the final grade (out of 100 points), x1.
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  MULTIPLE CHOICE 1. Which of the following techniques are applicable to quantitative data?a. The data arrayb. Frequency distributionsc. Stem-and-leaf displayd. Scatter diagram and Dotplote. All of these 2. The midway point between the upper and lower class limits for a frequency distribution is known as the:a. class interval.b. class width.c. class mark.d..
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  41. Compute the median salary. 42. Compute the variance of the salaries. 43. Compute the standard deviation of the salaries. 44. Compute the coefficient of variation. 45. Compute the range. 46. Compute the first quartile. 47. Compute the third quartile. 48. Compute the 90th percentile. NARRBEGIN: Texas DepartmentA monthly report to the Texas Department of Health, division of.
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  6.{Life Expectancy Narrative} Is there enough evidence at the 5% significance level to infer that the cholesterol level and the age at death are negatively linearly related?     7.{Life Expectancy Narrative} Is there sufficient evidence at the 5% significance level to infer that the number of points that the individual's blood pressure.
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