Discuss the below:
Q1. Conduct an experiment comparing two treatment conditions which contain data with 10 scores for each treatment condition.
a) how many subjects participated in the experiment if an independent-measure design was used?
b) how many subjects participated in the experiment if a repeated-measures design was used?
c) how many subjects participated in the experiment if a matched-subjects design was used?
Q2. A researcher for a cereal company wanted to demonstrate the health benefits of eating oatmeal. A sample of 9 volunteers was obtained and each participant ate a fixed diet without any oatmeal for 30 days. At the end of the 30-day period, cholesterol was measured for each individual. Then the participants began a second 30-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 participants are as follows: 0, -2, -11, -15, -12, +13, -9, -9, -8(negative scores indicates a decrease in cholesterol level). Are the data sufficient to demonstrate a significant change in cholesterol level after 30 days with an oatmeal diet? Use a two-tailed test with a=.05
Q3. Two studies on visual images were conducted. One study participants watched a screen, looking for brief presentations of a small blue arrow. The other study participants were asked to form a mental image. The results show that participants made more errors while forming images than while not forming images. Do the data indicate a significant difference between the two conditions? Use a two-tailed test with a=.05
Participants Error with Image Error without Image
A 14 4
B 9 2
C 12 10
D 7 8
E 10 6
D 8 6