A used car dealer says that the mean price of a three-year-old sports utility vehicle is $21,000. You suspect this claim is incorrect and find that a random sample of 24 similar vehicles has a mean price of $21,825 and a standard deviation of $1902. Is there enough evidence to reject the claim at a = 0.05? Compléte parts (a) through (e) below. Assume the population is normally distributed.

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.4: Distributions Of Data
Problem 19PFA
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A used car dealer says that the mean price of a three-year-old sports utility vehicle is $21,000. You suspect this claim is incorrect and find that a random
sample of 24 similar vehicles has a mean price of $21,825 and a standard deviation of $1902. Is there enough evidence to reject the claim at a = 0.05?
Complete parts (a) through (e) below. Assume the population is normally distributed.
nuuIiu U UIICE uLIIiai piaces as TIttutu.)
O A. t<
O B. t<
and t>
OC.
<t<
O D. t>
(c) Find the standardized test statistic t.
=1
(Round to two decimal places as needed.)
(d) Decide whether to reject or fail to reject the null hypothesis.
O A. Reject H, because the test statistic is in the rejection region(s).
O B. Fail to reject Ho because the test statistic is in the rejection region(s).
O C. Reject H, because the test statistic is not in the rejection region(s).
O D. Fail to reject Ho because the test statistic is not in the rejection region(s).
(e) Interpret the decision in the context of the original claim.
O A. At the 5% level of significance, there is not sufficient evidence to reject the claim that the mean price is not $21,000.
O B. At the 5% level of significance, there is not sufficient evidence to reject the claim that the mean price is $21,000.
OC. At the 5% level of significance, there is sufficient evidence to reject the claim that the mean price is $21,000.
O D. At the 5% level of significance, there is sufficient evidence to reject the claim that the mean price is not $21,000.
Transcribed Image Text:A used car dealer says that the mean price of a three-year-old sports utility vehicle is $21,000. You suspect this claim is incorrect and find that a random sample of 24 similar vehicles has a mean price of $21,825 and a standard deviation of $1902. Is there enough evidence to reject the claim at a = 0.05? Complete parts (a) through (e) below. Assume the population is normally distributed. nuuIiu U UIICE uLIIiai piaces as TIttutu.) O A. t< O B. t< and t> OC. <t< O D. t> (c) Find the standardized test statistic t. =1 (Round to two decimal places as needed.) (d) Decide whether to reject or fail to reject the null hypothesis. O A. Reject H, because the test statistic is in the rejection region(s). O B. Fail to reject Ho because the test statistic is in the rejection region(s). O C. Reject H, because the test statistic is not in the rejection region(s). O D. Fail to reject Ho because the test statistic is not in the rejection region(s). (e) Interpret the decision in the context of the original claim. O A. At the 5% level of significance, there is not sufficient evidence to reject the claim that the mean price is not $21,000. O B. At the 5% level of significance, there is not sufficient evidence to reject the claim that the mean price is $21,000. OC. At the 5% level of significance, there is sufficient evidence to reject the claim that the mean price is $21,000. O D. At the 5% level of significance, there is sufficient evidence to reject the claim that the mean price is not $21,000.
A used car dealer says that the mean price of a three-year-old sports utility vehicle is $21,000. You suspect this claim is incorrect and find that a random
sample of 24 similar vehicles has a mean price of $21,825 and a standard deviation of $1902. Is there enough evidence to reject the claim at a = 0.05?
Complete parts (a) through (e) below. Assume the population is normally distributed.
(a) Write the claim mathematically and identify H, and Ha.
Which of the following correctly states Ho and H?
O A. Ho: H= $21,000
Ha: µ < $21,000
O B. Ho: µ2 $21,000
Ha:H< $21,000
O C. Ho: H= $21,000
Ha:µ > $21,000
O D. Ho: H>$21,000
Ha:us $21,000
O E. Ho: µ= $21,000
O F. Ho: u#$21,000
Ha: H= $21,000
Ha: H# $21,000
(b) Find the critical value(s) and identify the rejection region(s).
What is(are) the critical value(s), to?
(Use a comma to separate answers as needed. Round to three decimal places as needed.)
Determine the rejection region(s). Select the correct choice below and fill in the answer box(es) within your choice.
(Round to three decimal places as needed.)
O A. t<
O B. t<
and t>
OC.
O D. t>
<t<
(c) Find the standardized test statistic t.
Transcribed Image Text:A used car dealer says that the mean price of a three-year-old sports utility vehicle is $21,000. You suspect this claim is incorrect and find that a random sample of 24 similar vehicles has a mean price of $21,825 and a standard deviation of $1902. Is there enough evidence to reject the claim at a = 0.05? Complete parts (a) through (e) below. Assume the population is normally distributed. (a) Write the claim mathematically and identify H, and Ha. Which of the following correctly states Ho and H? O A. Ho: H= $21,000 Ha: µ < $21,000 O B. Ho: µ2 $21,000 Ha:H< $21,000 O C. Ho: H= $21,000 Ha:µ > $21,000 O D. Ho: H>$21,000 Ha:us $21,000 O E. Ho: µ= $21,000 O F. Ho: u#$21,000 Ha: H= $21,000 Ha: H# $21,000 (b) Find the critical value(s) and identify the rejection region(s). What is(are) the critical value(s), to? (Use a comma to separate answers as needed. Round to three decimal places as needed.) Determine the rejection region(s). Select the correct choice below and fill in the answer box(es) within your choice. (Round to three decimal places as needed.) O A. t< O B. t< and t> OC. O D. t> <t< (c) Find the standardized test statistic t.
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