1) Do you know the best statistical test to use to answer research questions? For each of the following examples of research studies, which statistic would be best to answer the research question. Your choices include correlations, one sample t-test, two sample independent t-test, two sample paired t-test, and ANOVA. If a specific t-test or ANOVA is appropriate, please write the Ho and Hy If the test to be used is a correlation, please leave Ho and Hi blank. (4 pts each - 2 for statistical test; 1 for Ho and 1 for Hy) Research Question Statistical Test Used Ho H1 Fifty students were randomly assigned to receive either a new memory pill or a placebo. After treatment they were all asked to take a memory test to see how much they could recall. Could students recall more information after taking the memory pill compared to the placebo? All students at a top ten university are required to take the SAT prior to being considered for admission. Is there a difference between the SAT scores for the students in Engineering compared to students in the Business School? 3 We want to compare husbands and wives ratings of satisfaction with their relationship. Fifty couples were invited to take a questionnaire that evaluates relationship satisfaction. Are wives more satisfied with their I relationship than husbands? Research Question Statistical Test Used Ho This study examines how cholesterol is affected by three different strategies. A group of 300 people are randomly assigned to one of three conditions: 1) low fat diet only; 2) low fat diet and daily 4 mile walk and 3) low fat diet and daily 4 mile jog. After a month of engaging in their assigned strategy, cholesterol is measured, Is there a difference between the strategies? 5 All students at a top ten university are required to take the SAT prior to being considered for admission. The national average for SAT scores are 1000. Do the students at the top ten university have a higher SAT average than the national average? We want to know whether taking vitamin supplements makes a difference in visual acuity. We randomly assigned 20 participants to one of two groups. One group ate a normal diet and the other group had a normal diet plus vitamin supplements. After a month period, each person is tested for visual acuity. Is visual acuity different with supplements? You want to compare the short term effects of three new sleep-aid medications. Over the course of 30 days, a sample of 10 people will Drug A for 10 days, then Drug B for 10 days and then Drug C for 10 days. The hours slept each night will be recorded each night over the 30 days. Is there a difference between the medications ? Research Question Statistical Test Used Ho H1 8 We asked 500 participants to take a survey where they were asked a number of questions about their characteristics and behaviors. Participants were specifically asked what their income was and they were also asked how much time they spend exercising each week. Is there a relationship between income and time spent exercising? 9 Ten students from intro psychology are participants in a study that focused on peer pressure. Students were asked to estimate the length of a stick under two conditions. In one condition, the person is asked to give verbal estimates of the length of the stick in a room by themselves. In the second condition, the participant is joined by two others who unknown to the participant have been told to verbally give estimates that are way too long before the participant responds. Are the estimates longer in the condition when participants are with others versus when they are alone? 10 Traditional undergraduate programs often promote that students can complete their degree in 8 semesters. If we H examine all the students who have graduated with an undergraduate degree over the past year from UMass, does the UMass sample differ from the expected 8 semester time frame