In October, the campus bookstore asked a random set of freshmen and seniors how much they had spent on textbooks that semester. The bookstore believes that the two groups spent the same amount. What is an appropriate test value for a z test?
In October, the campus bookstore asked a random set of freshmen and seniors how much they had spent on textbooks that semester. The bookstore believes that the two groups spent the same amount. What is an appropriate test value for a z test?
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section: Chapter Questions
Problem 2PT
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Question
In October, the campus bookstore asked a random set of freshmen and seniors how much they had spent on textbooks that semester. The bookstore believes that the two groups spent the same amount. What is an appropriate test value for a z test?
![Freshmen
Seniors
Sample size
40
40
Sample mean
$440
$450
Population std. dev.
$57
$68](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F3b8662c8-9076-4137-ba55-d02c489865dc%2Fe62d3af5-fe19-47c8-9a50-ec248935e10b%2F2qkzfb_processed.jpeg&w=3840&q=75)
Transcribed Image Text:Freshmen
Seniors
Sample size
40
40
Sample mean
$440
$450
Population std. dev.
$57
$68
Expert Solution
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Step 1
Hypothesis Testing:
The value of the sample size is more than 30 and the aim is to compare the means of the 2 sample so Z-Test is preferrable.
Two Sample Z-test:
Z score=
where,
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