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A psychologist is studying the effect of belly stars on Sneetches. A random sample of four Sneetches ...

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A psychologist is studying the effect of belly stars on Sneetches. A random sample of four Sneetches ...

A psychologist is studying the effect of belly stars on Sneetches. A random sample of four Sneetches is drawn, and a test of self-image is given to each Sneetch before and after having the belly star status changed. (If the Sneetch initially had a star, it was removed; if it did not have a star, one was created on the Sneetch using the patented “Star-off/Star-on” procedure.) From the following sample data, does it appear that changing belly star status increases the average self-image of Sneetches? Select the appropriate critical value (CV), test statistic (TS), and decision. (Useα= 0.10).

Sneetch number	1	2	3	4
Image score before	120	88	100	25
Image score after	130	100	110	55

▸

CV = –1.6377; TS = –3.19; rejectH₀

▸

CV = –4.5407; TS = –6.38; rejectH₀

▸

CV = –1.3968; TS = –15.50; rejectH₀

▸

CV = –2.8965; TS = –6.38; fail to rejectH₀

Textbook

Introductory Statistics: A Problem-Solving Approach

Edition: 3^rd

Author: Kokoska

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