QUESTION 3 Students were given different drug treatment before revising for their examinations. some were given a memory drug, some a placebo and others no treatment. the exam scores (%) are shown for the three groups: MEMORY DRUG: 70,77,83,90,97. Mean: 83.40, variance: 112.40 PLACEBO: 37,43,50, 57, 63. mean:50.00, variance: 109.00 NO TREATMENT: 2, 10, 17, 23, 30 . Mean: 16.60, Variance: 112.30 GRAND MEAN: 50.00 GRAND VARIANCE: 892.14 (A) Carry out an analysis of variance to determine wether the treatments have different effects on the performance of the student (use alpha = 0.05)

30 randomly selected statistics students were first given 20 multiple-choice questions and then 20 open-ended questions – all on the same material. The lecturer was interested in determining which type of questions the students scored higher, on average. This experiment is an example of ______. a. a test of variances b. a two sample test of means c. a paired t test d. a two sample test of proportions

Explain how researchers used the drug ZIP to test its effect on long-term memory. How did they know that food aversion was a longterm memory phenomenon?

When looking at the percentage of patients whose symptoms were relieved after taking a placebo, a scientist sees a 20% success rate. The success rate of patients whose symptoms were relieved after taking a new composite drug was 30%. The scientist determines that the margin of error is 10%, which indicates that the new drug had no statistically significant positive effect. In which stage of the engineering process is this scientist?A.Looking for future improvementsB.Evaluating test resultsC.Identifying a needD.ScreeningSUBMITarrow_backPREVIOUS

In a medical experiment, scientist want to test if the new drug is more effective than the old one. They choose two group of patients randomly. There are 33 persons in the first group for new medicine, with the mean of 5.74, standard deviation of 6.74, and 25 people in the second group for the old one with the mean of 2.77, standard deviation of 6.28. At the 5% level of significance calculate the statistical value. 1 represent the new medicine group, and 2 represent the group that takes the old one. Assume that two populations are normally distributed and their variences are euqal. (Round your answer to two decimal places)

Question 7Select the research example for which a one-way between-groups ANOVA would be the appropriate test.1 pointResearchers want to test for a difference in memory scores before and after a new memory technique is introduced.Researchers want to examine the relationship between the number of class absences and final course grade.Researchers compared the mean difficulty rating of math problems among groups of participants who experienced a positive stressor, a negative stressor, or no stressor, respectively.College administrators are interested in whether high school GPA predicts college GPA.