In an experiment to test a memory supplement, 200 subjects were assigned randomly to take the supplement or a placebo (100 in each group). The memory score of each group was then measured. Can you support the claim that there is a difference in the mean memory scores between the supplement and placebo groups? Conduct the test with a significance level of 10%. Results and p-values many test runs are shown below. Supplement Placebo 5.23 sample mean sample std dev sample size 6.61 5.03 4.10 100 100 Reported p-values two tail left tail right tail F-test for variances 0.033 pooled variance t-test 0.032 0.984 0.016 unequal variance t-test matched pairs t-test 0.038 0.981 0.019 0.048 0.976 0.024

An automobile dealer conducted a test to determine if the time in minutes needed to complete a minor engine tune-up depends on whether a computerized engine analyzer or an electronic analyzer is used. Because tune-up time varies among compact, intermediate, and full-sized cars, the three types of cars were used as blocks in the experiment. The data obtained follow. Analyzer Computerized Electronic Compact 50 41 Car Intermediate 57 44 Full-sized 61 47 Use a = 0.05 to test for any significant differences. State the null and alternative hypotheses. Ho: HCompact + HIntermediate Ha: HCompact H Full-sized = HIntermediate HFull-sized Ho: HComputerized HElectronic Ha: "Computerized = HElectronic Ho: HComputerized = HElectronic PCompact = HIntermediate HFull-sized %D H: Not all the population means are equal. Ho: HCompact = "Intermediate = HFull-sized + HFull-sized Ha: HCompact * HIntermediate Hoi HComputerized HElectronic Ha: HComputerized * HElectronic Find the value of the test statistic.…

Triglycerides are blood constituents that are thought to play a role in coronary artery disease. An experiment was conducted to see if regular exercise could reduce triglyceride levels. Researchers measured the concentration of triglycerides in the blood serum of seven male volunteers before and after participation in a 10-week exercise program. The results are shown below. Note the variation in levels from one person to the next, both before and after. But an overall pattern of reduction after exercise is clear. An obvious question to ask is: Does exercise reduce triglyceride levels? (Hint: This is the same as asking "Are the mean triglyceride levels in the blood serum of males higher before participation in a 10 week exercise program?") Conduct a significance test at the 0.05 level of significance to answer the proposed research question. Volun teer 1 2 3 4 5 6 7 Befor After e 0.57 1.03 1.47 3.14 1.43 2.14 1.2 2.98 1.09 1.18 1.51 1.6 0.87 1.13 What code would be used to answer the…

If the alternative hypothesis states that alcohol affects short-term memory, the null hypothesis states O alcohol does not affect short-term memory O alcohol decreases short-term memory alcohol does not decrease short-term memory

The researchers hypothesised that people who receive an audiovisual presentation will have a different mean level of recall of ad information as those who receive only the visual aspects of the ad. What significance test should the researchers use for testing their hypothesis?

Using SPSS, analyze the relationship between respondents’ marital status (MARITAL) and whether they believe it is alright for a couple to live together without intending to get married (COHABOK) using crosstabulation.  Which marital status category is most disapproving of nonmarital cohabitation?  Which marital status category is most approving of nonmarital cohabitation?  Is the relationship between marital status and attitude toward nonmarital cohabitation statistically significant at the .05 level?  Compute and interpret an appropriate measure of association for this relationship.