Statistics Expert Answers / Study Resources

MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. Solve the problem. 72) The reading level of a random sample of men and a random sample of women are measured. Researchers want know whether women typically read at a higher level than men. A) Independent B) Dependent 73) The.

Solve the problem. 46) The weights at birth of five randomly chosen baby giraffes were 111, 115, 120, 103, and 106 pounds. Assume the distribution of weights is normally distributed. Find a 95% confidence interval for the mean weight of all baby giraffes. Use technology for your calculations. Give the confidence.

SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question. 82) In a study of feeding behavior, zoologists recorded the number of grunts of a warthog feeding by a lake in the 15 minute period following the addition of food. The data showing the number.

Assume that the average Systolic blood pressure for adults age 50-54 is 125 mmHg with a standard deviation of 5 mmHg. It is known that Systolic blood pressure is not normally distributed. A sample of 25 adult Systolic blood pressure measurements are taken from the population. 36) What is the approximate.

SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question. 66) Test the hypothesis that m1 < m2. Two samples are randomly selected from normal populations. The sample statistics are given below. n1 = 15 n2 = 15 overbar(x1) = 23.1 overbar(x2) = 25.65 s1 = 2.9 s2.

TRUE/FALSE. Write 'T' if the statement is true and 'F' if the statement is false. 192) True or False: Referring to Scenario 10-18, based on the Tukey-Kramer procedure with an overall level of significance of 0.05, the retailer would decide that the 3 means other than the mean for Tornado are.

Perform the appropriate hypothesis test. 129) The data represent the measure of a variable before and after a treatment. Does the sample evidence suggest that the treatment is effective in increasing the value of the response variable? Use the α = 0.01 level of significance. Assume that the differenced data come.

MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 29) Probabilities of different types of vehicle-to-vehicle accidents are shown below: Accident        Probability Car to Car          0.52 Car to Truck       0.17 Truck to Truck      0.31 Find the probability that an accident involves a car. A) 0.52 B) 0.69 C) 0.31 D) 0.17 30) A hospital reports.

SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question. 121) The rate of return for an investment can be described by a normal distribution with mean 36% and standard deviation 3%. What is the probability that the rate of return for the investment will.

MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 58) Find the test statistic, t, to test the hypothesis that m1 = m2. Two samples are randomly selected and come from populations that are normal. The sample statistics are given below. n1 = 25 n2 =.

MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. Solve the problem. 1) A revenue department is under orders to reduce the time small business owners spend filling out pension form ABC-5500. Previously the average time spent on the form was 6.3 hours. In order to.

SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question. 86) Test the hypothesis that m1 < m2. Two samples are randomly selected from each population. The sample statistics are given below. Use α = 0.05. n1 = 35 n2 = 42 overbar(x1) = 21.45 overbar(x2) =.

MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. Solve the problem. 70) A small study was conducted on a new procedure for treating atrial fibrillation. The study involved a new way to perform ablation surgery. One method currently being used had a success rate of.

MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 252) In a one-way ANOVA A) an interaction effect can be tested. B) the interaction term has (c — 1) (n — 1) degrees of freedom. C) an interaction term is present. D) there is no interaction term. TRUE/FALSE. Write 'T'.

Use the following information to answer the question. A sprint duathlon consists of a 5 km run, a 20 km bike ride, followed by another 5 km run. The mean finish time of all participants in a recent large duathlon was 1.67 hours with a standard deviation of 0.25 hours..

Use the following table to answer the question. The following table summarizes the outcomes of a study that researchers carried out to determine if females expressed a greater fear of heights than males.   Men Women Expressed a fear of heights 68 109 Did not express a fear of heights 94 89 4) How many categorical variables are summarized in.

MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 4) A survey of high school teenagers reported that 79% of those sampled are interested in pursuing a college education. Does this statement describe descriptive or inferential statistics? A) Inferential statistics B) Descriptive statistics 6) From past figures,.

SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question. Test the indicated hypothesis. 119) At a retail store, 61 female employees were randomly selected and it was found that their monthly income had a standard deviation of $85.05. For 121 male employees, the standard deviation.

MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. Use the following table to answer the question. The following table summarizes the outcomes of a study that researchers carried out to determine if females expressed a greater fear of flying than males.   Men Women Expressed a fear of.

MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 85) A researcher wants to know whether athletic women are more flexible than non-athletic women. For this experiment, a woman who exercised vigorously at least four times per week was considered "athletic". Flexibility is measured in.

Answer the question True or False. Solve the problem. 153) Transportation officials tell us that 60% of drivers wear seat belts while driving. Find the probability that more than 562 drivers in a sample of 900 drivers wear seat belts. A) 0.0630 B) 0.9370 C) 0.4 D) 0.6 155) Transportation officials tell us that 60% of.

The roads in a particular state are in very poor condition, but the state claims that it does not have enough money to repair the roads. A proposal is on the ballot to raise the sales tax in the state from 6% to 7% to pay for repairing the roads..

The roads in a particular state are in very poor condition, but the state claims that it does not have enough money to repair the roads. A proposal is on the ballot to raise the sales tax in the state from 6% to 7% to pay for repairing the roads..

SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question. 79) Test the hypothesis that m1 > m2. Two samples are randomly selected from normal populations. The sample statistics are given below. Use α = 0.005. n1 = 18 n2 = 13 overbar(x1) = 505 overbar(x2) =.

SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question. 36) How much money does the average professional football fan spend on food at a single football game? That question was posed to 42 randomly selected football fans. The sample results provided a sample mean.

SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question. 75) A revenue department is under orders to reduce the time small business owners spend filling out pension form ABC-5500. Previously the average time spent on the form was 70 hours. In order to test.

MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. Solve the problem. 36) How many tissues should a package of tissues contain? Researchers have determined that a person uses an average of 45 tissues during a cold. Suppose a random sample of 2500 people yielded the.

MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 24) Suppose that the average pop song length in America is 4 minutes with a standard deviation of 1.25 minutes. It is known that song length is not normally distributed. Suppose a sample of 25 songs.

Test the indicated hypothesis. Assume that the populations are normally distributed. 109) Test the hypothesis that s1 > s2 at the α = 0.01 level of significance for the given sample data.   Population 1 Population 2 n 61 31 s 34.5 26.7   A) Test statistic: F = 1.67. Critical value = 2.21. Do not reject H0. B) Test statistic: F =.

Perform the appropriate hypothesis test. 125) A random sample of n1 = 40 individuals results in x1 = 10 successes. An independent sample of n2 = 40 individuals results in x2 = 8 successes. Does this represent sufficient evidence to conclude that p1 > p2 at the α = 0.01 level.

MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 212) If we are testing for the difference between the means of 2 related populations with samples of n1 = 20 and n2 = 20, the number of degrees of freedom is equal to A) 38 B) 19 C).

MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. Solve the problem. 40) A sociologist recently conducted a survey of senior citizens who have net worths too high to qualify for Medicaid but have no private health insurance. The ages of the 25 uninsured senior citizens.

MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 242) The test for the equality of two population variances is based on A) the difference between the sample variances divided by the difference between the sample means. B) the difference between the 2 population variances. C) the difference.

SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question. 88) An engineer collects the following data showing the speed and miles per gallon of a 4-door sedan.   Speed, s Miles per Gallon, M 30 17 35 21 40 24 40 25 45 29 50 29 55 33 60 30 65 25   a) Draw a scatter diagram of the data. What type of relation appears to.

MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. Use the following information to answer the question. Lambda olive oil is touted as the "World's most expensive olive oil." A twelve ounce bottle typically costs fifty dollars or more. In a blind taste test, a.

MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. Solve the problem. 6) What is zα/2 when α = 0.01? A) 2.575 B) 1.96 C) 2.33 D) 1.645 7) What is the confidence level of the following confidence interval for μ? overbar(x) ± 0.99((σ/√(n))) A) 99% B) 90% C) 80% D) 67% 8) The registrar's office at.

MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. Solve the problem. 62) According to a recent study, 1 in every 7 women has been a victim of domestic abuse at some point in her life. Suppose we have randomly and independently sampled twenty-five women and.

MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 27) The owners of an industrial plant want to determine which of two types of fuel (gas or electricity) will produce more useful energy at a lower cost. The cost is measured by plant investment per.

MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 74) A marketing research company is estimating which of two soft drinks college students prefer. A random sample of 168 college students produced the following confidence interval for the proportion of college students who prefer drink.

A realtor wants to compare the mean sales-to-appraisal ratios of residential properties sold in four neighborhoods (A, B, C, and D). Four properties are randomly selected from each neighborhood and the ratios recorded for each, as shown below. A: 1.2, 1.1, 0.9, 0.4 C: 1.0, 1.5, 1.1, 1.3 B: 2.5, 2.1, 1.9,.

SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question. 222) The Wall Street Journal recently ran an article indicating differences in perception of sexual harassment on the job between men and women. The article claimed that women perceived the problem to be much more.

SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question. 124) Referring to Scenario 12-11, what is the standard error of estimate? 125) Referring to Scenario 12-11, what is the standard deviation around the regression line? MULTIPLE CHOICE. Choose the one alternative that best completes the statement.

ESSAY. Write your answer in the space provided or on a separate sheet of paper. 182) True or False: Referring to Scenario 10-18, the test is valid only if the population of speeds has the same variance for the 4 brands. 183) True or False: Referring to Scenario 10-18, the test is.

MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 13) A consumer protection agency is comparing the work of two electrical contractors. The agency plans to inspect residences in which each of these contractors has done the wiring in order to estimate the difference in.

MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. Use the following information to answer the question. A sprint duathlon consists of a 5 km run, a 20 km bike ride, followed by another 5 km run. The mean finish time of all participants in.

MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 202) Given the following information, calculate the degrees of freedom that should be used in the pooled-variance t test. s12 = 4 s22 = 6 n1 = 16 n2 = 25 A) df = 25 B) df = 16 C) df.

SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question. 58) Recently, many states have been considering legalizing the use of marijuana. A survey was taken in 2014 where adults in one state were asked if they favored legalizing the use of marijuana. The following.

SCENARIO 10-17 A realtor wants to compare the mean sales-to-appraisal ratios of residential properties sold in four neighborhoods (A, B, C, and D). Four properties are randomly selected from each neighborhood and the ratios recorded for each, as shown below. A: 1.2, 1.1, 0.9, 0.4 C: 1.0, 1.5, 1.1, 1.3 B: 2.5, 2.1,.

According to the website www.costofwedding.com, the average cost of catering a wedding (with an open bar) is $100 per person. Recently, in a random sample of 40 weddings in the U. S. it was found that the average catering cost was $110, with a standard deviation of $12. On the.

MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 232) The Wall Street Journal recently ran an article indicating differences in perception of sexual harassment on the job between men and women. The article claimed that women perceived the problem to be much more prevalent.