13.6: It’s well established, we’ll assume, that lab rats require an average of 32 trials in a complex water maze. Before reaching a learning criterion of three consecutive errorless trials. To determine whether a mildly adverse stimulus has any effect on performance, a sample of seven lab rats were ….mild electrical shock just before each trial.
13.8: Assume that on average, healthy young adults dream 90 minutes each night. As inferred from a number of measures, including rapid eye movement (REM) sleep. An investigator wishes to determine whether drinking coffee just before going to sleep affects the amount of dream time…
13.9: In the gas mileage test described in this chapter, would you prefer a smaller or a larger sample size if you were
PSY 520 Topic 5 Exercise, Chapter 14
13.10: Even though the population standard deviation is unknown. An investigator uses z rather than the more appropriate t to test a hypothesis at the .05 level of signiﬁcance.
14.11 To test compliance with authority, a classical experiment in social psychology. Requires subjects to administer increasingly painful electric shocks to seemingly helpless victims. Who agonize in an adjacent room.* Each subject earns a score between 0 and 30, depending on the point at which the subject refuses to comply with authority—an investigator, dressed in a white lab coat, who orders the administration of increasingly intense shocks.
14.12 ……and control groups of 35 each. After two months of training, the sample mean IQ (–X1) for the treatment group equals 110. And the sample mean IQ (–X2) for the control group equals 108. The estimated standard error equals 1.80.
14.14: An investigator wishes to determine whether alcohol consumption causes a deterioration in the performance of automobile drivers. Before the driving test, subjects drink a glass of orange juice. Which, in the case of the treatment group, ..with two ounces of vodka. Performance is measured by the number of errors made on a driving simulator. psy 520 topic 5 exercise
PSY 520 Topic 5 Exercise, Chapter 15
15.7: An educational psychologist wants to check the claim that regular physical exercise improves academic achievement. …attends daily exercise classes or a control group. psy 520 topic 5 exercise
15.8: A school psychologist wishes to determine. Whether a new antismoking ﬁlm actually reduces the daily consumption of cigarettes by teenage smokers. The mean daily …. for each of eight teen-age smokers during the month before and the month after the ﬁ lm presentation:
15.10: In a classic study, which predates the existence of the EPO drug. Melvin Williams of Old Dominion University actually injected extra oxygen-bearing red cells into the subjects’ bloodstream just prior to a treadmill test. Twelve long-distance runners …in 5-mile runs on treadmills. …The 12 athletes had a mean difference running time. D, of 51.33 seconds with a standard psy 520 topic 5 exercise
15.14: In Table 7.4 on page 173, all ten top hitters in the major league baseball in 2011 had lower batting averages in 2012, supporting regression toward the mean. psy 520 topic 5 exercise Treating averages as whole numbers (without decimal points) and subtracting their batting averages for 2012 from those for 2011 (so that positive difference scores support regression toward the mean), we have the following ten difference scores: 14, 39, 61, 60, 13, 21, 50, 93, 16, 61.