Business Statistics: A First Course (8th Edition)
8th Edition
ISBN: 9780135177785
Author: David M. Levine, Kathryn A. Szabat, David F. Stephan
Publisher: PEARSON
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1. A sample of data is collected from a group of college students (X = 112, Sx = 12, N = 58). It is hypothesized that members of
this group have higher test scores than the general population (u = 100, o = 15). What test do you conduct? Don't do the test,
just name the test and list the relevant equation for the test statistic.
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37
A software developer wants to test if a new mobile phone app they have designed is better than a similar
existing app. In particular they wish to test the hypotheses
Ho: UN HO
and
H₁ HN > Ho
where UN is the population mean of a satisfaction rating for users of the new app and po is the population
mean satisfaction rating for users of the existing app. (The satisfaction rating is scaled so that '0'
corresponds to 'worst app ever' and '100' corresponds to 'best app ever'.)
The software developer gathers satisfaction ratings from 14 users of the new app and 18 users of the
existing app. Using the procedure for a two-sample t-test, the test statistic turns out to be 1.35.
What is the value of the critical value at the 5% significance level that this test statistic should be
compared with? (Give your answer to three decimal places.)
Answer:
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