Statistics Expert Answers / Study Resources : Page 3

Solve the problem. 36) Which of the following statements is characteristics of the sampling distribution of a sample proportion? A) The mean of the sampling distribution is the same as the mean of the population from which the data were sampled. B) The standard deviation of the sampling distribution is the same as.

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,.

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. 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.

Solve the problem. 34) Complete the statement by filling in the blanks. The null hypothesis H0 is the statement of _________ and always has a ______ sign. The alternative hypothesis Ha is the __________ hypothesis. It is a statement about the value of a __________ that we intend to test. A) no change;.

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.

Solve the problem. 71) Suppose that in a recent poll of 900 adults between the ages of 35 and 45, 22% surveyed said they have thought about participating in an extreme sport such as bungee jumping. Find the 95% confidence interval for the proportion of adults ages 35 to 45 who.

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.

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,.

MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. Obtain the required confidence interval for the difference between two population proportions. Assume that independent simple random samples have been selected from the two populations. 91) In a random sample of 39 Democrats from one city, 30.

A janitor at a large office building believes that his supply of light bulbs has a defect rate that is higher than the defect rate stated by the manufacturer. The janitor's null hypothesis is that the supply of light bulbs has a manufacturer's defect rate of p = 0.09. He.

MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. Solve the problem. 3) An entomologist writes an article in a scientific journal which claims that fewer than 22 in ten thousand male fireflies are unable to produce light due to a genetic mutation. A) H0: p >.

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.

MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 82) A local tennis pro-shop strings tennis rackets at the tension (pounds per square inch) requested by the customer. Recently a customer made a claim that the pro-shop consistently strings rackets at lower tensions, on average,.

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. Fill in the blank to complete the statement. 4) Suppose that the age of all the U. S. vice presidents when they took office was recorded. The collection of the ages of all the U. S. vice.

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.

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.

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 =.

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. 25) Which of the following statements is not true about a sampling distribution? A) It tells us how often we can expect to see particular values of our estimator. B) It is used for making inferences about a.

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. Provide an appropriate response. 1) Classify the two given samples as independent or dependent. Sample 1: Pre-training blood pressure of 24 people Sample 2: Post-training blood pressure of 24 people A) dependent B) independent 2) Classify the two given samples as.

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'.

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.

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. 102) Test the claim that σ < 11.85 if n = 28, s = 9.35 and α = 0.10. Assume that the population is normally distributed. 103) Test the claim that σ ≠ 10.44 if n.

Formulate the indicated conclusion in nontechnical terms. Be sure to address the original claim. 84) A psychologist claims that more than 55 percent of the population suffers from professional problems due to extreme shyness. Assuming that a hypothesis test of the claim has been conducted and that the conclusion is failure.

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.

MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. Solve the problem. 47) Suppose that New Mexico lawmakers survey 160 randomly selected registered voters to see if they favor stricter laws regarding motorcycle helmet use for riders over the age of 17. The lawmakers believe the.

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.

From a random sample of workers at a large corporation you find that 58% of 200 went on a vacation last year away from home for at least a week. 81) What is the margin of error for the 95% confidence interval of (0.50, 0.66) of coworkers who went on a.

MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. Solve the problem. 72) A quality control manager thinks that there is a higher defective rate on the production line than the advertised value of p = 0.025. She does a hypothesis test with a significance level.

Solve the problem. 66) A researcher completes a hypothesis test with a resulting p-value = 0.076. Choose the best statement to interpret the results. A) The p-value is above a standard cutoff value of α = 0.05 and therefore there is insufficient evidence to support that the city of interest has a.

SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question. 92) Test the claim that s2 = 38.7 if n = 12, s2 = 32.4 and α = 0.05. Assume that the population is normally distributed. 93) Test the claim that s2 ≤ 7.2 if n.

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.

SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question. 97) Test the claim that s2 ≠ 61.2 if n = 10, s2 = 67.5, and α = 0.01. Assume that the population is normally distributed. 98) Test the claim that σ = 8.28 if n.

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. 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 =.

SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question. 45) Increasing numbers of businesses are offering child-care benefits for their workers. However, one union claims that more than 80% of firms in the manufacturing sector still do not offer any child-care benefits to their.

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. 14) Understand survey terminology] Researchers are interested in learning more about the age of young adults who watch a certain television program. By interviewing people at a shopping mall, they can identify people who watch this show. The collection of the ages of these young adults who watch.

Provide an appropriate response. 66) Find the standardized test statistic t for a sample with n = 20, overbar(x) = 11.9, s = 2.0, and a = 0.05 if H1: m < 12.3. Round your answer to three decimal places. A) -0.872 B) -0.894 C) -1.233 D) -1.265 67) Find the standardized test statistic t for.

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.

SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question. 40) Data sets A and B are dependent. Test the claim that md =0. Use α = 0.01. A 9.0 10.0 11.9 8.9 9.0 B 11.4 10.3 10.2 10.1 11.5   Assume that the paired data came from a population that is normally distributed. SHORT ANSWER. Write the word or.

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.

MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. Solve the problem. 52) From the TI-84 graphing calculator screenshots below, choose the screenshot whose shaded area depicts a p-value for a left-tailed test. A) B) C) 54) From the TI-84 graphing calculator screenshots below, choose the screenshot whose shaded area.

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.

Solve the problem. 57) According to the manufacturer of the candy Skittles, 25% of the candy produced are green. If we take a random sample of 10 bags of Skittles, what is the probability that the proportion in our sample of green candies will be more than 25%? Which statement, if.

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..