Read the problem below and answer the following questions. 1) What statistical test should be used to solve this problem? 2) Is the treatment factor fixed or random? 3) Is the treatment factor ranked or nominal? An investigator wishes to test the effect of 3 diets on weight gain in mice. Fifteen laboratory mice of the same age were randomly assigned to one of 3 diets (mouse chow, carrots, potato chips). The investigator wants to know if diet affects weight gain. For the toolbar, press ALT+F10 (PC) or ALT+FN+F10 (Mac). B IU S Paragraph Arial 14px A v 日Q .. !!!

Researchers investigate how the presence of cell phones influence the quality of human interaction.  Subjects are randomly selected from a population and divided into an experimental group that is asked to leave their phones in the front of the room and a control group that are not asked to leave their cell phones at the front of the room.  Subjects are left alone for 10 minutes and then asked to take a survey designed to measure quality of interactions they had with others in the experiment.  What statistical test is appropriate?

Suppose you were presented with the results of a study comparing two different training methods for basketball athletes. You are told 32 athletes were randomly assigned to the two groups so that 16 were in the group A and 16 were in the group B. At the end of the session, the average scores (wins versus losses) of the two groups/teams were compared and a difference of 10% was observed ( the first team had 10% more wins than the second). The coach observer reports two- sample t-test shows this difference is statistically significant. How would you interpret these findings? What questions or concerns would you have? How might this type of study be improved? Hint: Consider the possibility that the test performed was not the appropriate one.

A 2x2 experiment looks at how obesity and hunger affect the amount of food people eat. The results are shown below. n=10 participants per condition. Additional info if needed: N=40, G=120, ∑?2=640∑x2=640    please conduct a twoway ANOVA and draw conclusions about the main effects and interaction of obesity and hunger on food intake.      Obesity (Factor B)       B1 (Obese) B2 (normal weight) Hunger A1 (not hungry) M=4 SS=50 M=1 SS=30 Factor A A2 (hungry) M=5 SS=60 M=2 SS=40