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# Paired T test: Oatmeal & Image formation

Behavioral Statistics Questions

22. A researcher for a ceral company wanted to demonstrate the health benefits of eating oatmeal. A sample of 9 volunteers was obtained and each participant are a fixed diet without any oatmeal for 30days. At the end of the 30 day period, cholesterol was measured for each individual. Then the participants began a second 30 day period in which they repeated exactly the same diet except that they added 2 cups of oatmeal each day. after the second 30 day period, cholesterol levels were measured again. The scores for the 9 paricipants are as follows: 0, -2, -11, -15, -12, +3, -9, -9, -8 ( a negative score indicates a decrease in cholesterol level). Are the data sufficient to demonstrate a significant change in cholesterol level after 30days with an oatmeal diet? Use a two-tailed test with &#945;=.05.

23. A variety of research results suggest that visual images interfere with visual perception. In one study, segal and fusella had participants watch a screen, looking for brief presentations of a small blue arrow. On some trails, the participants were also asked to form a mental image (for example a volcano). The results show that participants made more errors while forming images than while not forming images. Data similar to the segal and fusella results are as follows. Do the data indcate a significant difference between the two conditions? Use a two tailed test with &#945;=05.
Paricipant errors with image errors without image
a 14 4
b 9 2
c 12 10
d 7 8
e 10 6
f 8 6

#### Solution Summary

The solution provides step by step method for the calculation of t statistic for paired t test. Formula for the calculation and Interpretations of the results are also included. Interactive excel sheet is included. The user can edit the inputs and obtain the complete results for a new set of data.

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