Stats help!?

Posted on 2016-03-03 18:50:00 in Statistics by VICTORIA

Scenario 10-8 
A researcher wished to test the effect of the addition of extra calcium to yogurt on the “tastiness” of 
yogurt. Sixty-two adult volunteers were randomly divided into two groups of 31 subjects each. Group 1 
tasted yogurt containing the extra calcium. Group 2 tasted yogurt from the same batch as group 1 but 
without the added calcium. Both groups rated the flavor on a scale of 1 to 10, with 1 being “very 
unpleasant” and 10 being “very pleasant.” The mean rating for group 1 was with a standard 
deviation of The mean rating for group 2 was with a standard deviation of . 
Let and represent the mean ratings we would observe for the entire population represented by the 
volunteers if all members of this population tasted, respectively, the yogurt with and without the added 
calcium. 
____ 12. Use Scenario 10-8. Which of the following would lead us to believe that the t-procedures were not safe to 
use in this situation? 
A. The sample medians and means for the two groups were slightly different. 
B. The distributions of the data for the two groups were both slightly skewed right. 
C. The data are integers between 1 and 10 and so cannot be normal. 
D. The standard deviations from both samples were very different from each other. 
E. None of the above.

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