4. The effectiveness of the Weight Watchers diet is tested in an experiment, and for each subject, the weight before the diet and the weight after the diet are recorded. a. Claim: ___________ b. Ho: _________________________ Ha: _________________________ c. Analysis: _________________________ d. Tail of the distribution: _________________________
4. The effectiveness of the Weight Watchers diet is tested in an experiment, and for each subject, the weight before the diet
and the weight after the diet are recorded.
a. Claim: ___________
b. Ho: _________________________
Ha: _________________________
c. Analysis: _________________________
d. Tail of the distribution: _________________________
5. The effectiveness of a flu vaccine is tested by treating one group of subjects with the vaccine while another group of subjects
is given placebos. Is there a significant difference among the two groups?
a. Claim: ___________
b. Ho: _________________________
Ha: _________________________
c. Analysis: _________________________
d. Tail of the distribution: _________________________
II. Solve the following problems:
1. A
99% confidence interval for the population mean μ.
2. In a study of factors affecting hypnotism, visual analogue scale (VAS) sensory ratings were obtained for 16 subjects. For
these sample ratings, the mean is 8.33 while the standard deviation is 1.96 (based on data from “An Analysis of Factors
That Contribute to the Efficacy of Hypnotic Analgesia,” by Price and Barber, Journal of Abnormal Psychology, Vol. 96,
No. 1). At 0.01 level of significance, test the claim that this sample comes from a population with a mean VAS rating of
less than 10.00.
a. Claim (in symbolic form): __________
b. Ho:
Ha:
c. level of significance: test-statistic: _____ tail of distribution: ______
d.Decision Rule: Reject Ho if ______________
e. Computation
f. Decision (Reject Ho or Failed to reject Ho)
g.Conclusion
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