A telephone counseling service for adolescents tested whether the length of calls would be affected by a special telephone system that had a better sound quality. Over the past several years, the lengths of telephone calls (in minutes) were normally distributed with μ=14 and σ=8. The service arranged to have the special phone system loaned to them for one day. On that day, the mean length of the 44 calls they received was 15 minutes. Test whether the length of calls has changed using the 5% significance level. Complete parts (a) through (d). (a) Carry out a Z test using the five steps of hypothesis testing. Determine a research hypothesis and a null hypothesis. Choose the correct answer below. A. The research hypothesis is the mean of the populations are the same. The null hypothesis is the mean of the general population is less than the mean of the sample population. B. The research hypothesis is the mean of the populations are the same. The null hypothesis is the mean of the populations are not the same. C. The research hypothesis is the mean of the populations are the same. The null hypothesis is the mean of the general population is greater than the mean of the sample population. D. The research hypothesis is the mean of the populations are not the same. The null hypothesis is the mean of the populations are the same. Assume that the distribution of means is approximately normal. What are the cutoff sample scores on the comparison distribution at which the null hypothesis should be rejected? nothing (Type integers or decimals rounded to two decimal places as needed. Use a comma to separate answers as needed.) Determine the sample's Z score on the comparison distribution. Z=nothing (Type an integer or a decimal rounded to two decimal places as needed.) Decide whether to reject the null hypothesis. Explain. Choose the correct answer below. A. The sample score is extreme enough to reject the null hypothesis. The research hypothesis is supported. B. The sample score is extreme enough to reject the null hypothesis. The research hypothesis is false. C. The sample score is not extreme enough to reject the null hypothesis. The research hypothesis is true. D. The sample score is not extreme enough to reject the null hypothesis. The experiment in inconclusive
A telephone counseling service for adolescents tested whether the length of calls would be affected by a special telephone system that had a better sound quality. Over the past several years, the lengths of telephone calls (in minutes) were normally distributed with μ=14 and σ=8. The service arranged to have the special phone system loaned to them for one day. On that day, the mean length of the 44 calls they received was 15 minutes. Test whether the length of calls has changed using the 5% significance level. Complete parts (a) through (d). (a) Carry out a Z test using the five steps of hypothesis testing. Determine a research hypothesis and a null hypothesis. Choose the correct answer below. A. The research hypothesis is the mean of the populations are the same. The null hypothesis is the mean of the general population is less than the mean of the sample population. B. The research hypothesis is the mean of the populations are the same. The null hypothesis is the mean of the populations are not the same. C. The research hypothesis is the mean of the populations are the same. The null hypothesis is the mean of the general population is greater than the mean of the sample population. D. The research hypothesis is the mean of the populations are not the same. The null hypothesis is the mean of the populations are the same. Assume that the distribution of means is approximately normal. What are the cutoff sample scores on the comparison distribution at which the null hypothesis should be rejected? nothing (Type integers or decimals rounded to two decimal places as needed. Use a comma to separate answers as needed.) Determine the sample's Z score on the comparison distribution. Z=nothing (Type an integer or a decimal rounded to two decimal places as needed.) Decide whether to reject the null hypothesis. Explain. Choose the correct answer below. A. The sample score is extreme enough to reject the null hypothesis. The research hypothesis is supported. B. The sample score is extreme enough to reject the null hypothesis. The research hypothesis is false. C. The sample score is not extreme enough to reject the null hypothesis. The research hypothesis is true. D. The sample score is not extreme enough to reject the null hypothesis. The experiment in inconclusive
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section: Chapter Questions
Problem 22SGR
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A telephone counseling service for adolescents tested whether the length of calls would be affected by a special telephone system that had a better sound quality. Over the past several years, the lengths of telephone calls (in minutes) were
μ=14
and
σ=8.
The service arranged to have the special phone system loaned to them for one day. On that day, the
44
calls they received was
15
minutes. Test whether the length of calls has changed using the 5% significance level. Complete parts (a) through (d).
(a) Carry out a Z test using the five steps of hypothesis testing. Determine a research hypothesis and a null hypothesis. Choose the correct answer below.
The research hypothesis is the mean of the populations are the same. The null hypothesis is the mean of the general population is less than the mean of the sample population.
The research hypothesis is the mean of the populations are the same. The null hypothesis is the mean of the populations are not the same.
The research hypothesis is the mean of the populations are the same. The null hypothesis is the mean of the general population is greater than the mean of the sample population.
The research hypothesis is the mean of the populations are not the same. The null hypothesis is the mean of the populations are the same.
Assume that the distribution of means is approximately normal. What are the cutoff sample scores on the comparison distribution at which the null hypothesis should be rejected?
nothing
(Type integers or decimals rounded to two decimal places as needed. Use a comma to separate answers as needed.)
Determine the sample's Z score on the comparison distribution.
Z=nothing
(Type an integer or a decimal rounded to two decimal places as needed.)Decide whether to reject the null hypothesis. Explain. Choose the correct answer below.
The sample score is extreme enough to reject the null hypothesis. The research
hypothesis is supported.The sample score is extreme enough to reject the null hypothesis. The research hypothesis is false.
The sample score is not extreme enough to reject the null hypothesis. The research hypothesis is true.
The sample score is not extreme enough to reject the null hypothesis. The experiment in inconclusive
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