Chapter 10: Q.10.10 (page 405)
The primary concern is deciding whether the mean of Population 2 differs from the mean of Population 1 .
Short Answer
(a) Null hypotheses:
Alternate hypotheses:
(b) The hypotheses test is two-tailed.
Chapter 10: Q.10.10 (page 405)
The primary concern is deciding whether the mean of Population 2 differs from the mean of Population 1 .
(a) Null hypotheses:
Alternate hypotheses:
(b) The hypotheses test is two-tailed.
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Get started for freeIn each of Exercises 10.35-10.38, we have provided summary statistics for independent simple random samples from two populations. Preliminary data analyses indicate that the variable under consideration is normally distributed on each population. Decide, in each case, whether use of the pooled -lest and pooled -interval procedure is reasonable. Explain your answer.
10.35
The intent is to employ the sample data to perform a hypothesis test to compare the means of the two populations from which the data were obtained. In each case, decide which of the procedures should be applied.
Independent:
Stressed-Out Bus Drivers. An intervention program designed by the Stockholm Transit District was implemented to improve the work conditions of the city's bus drivers. Improvements were evaluated by G. Evans et al., who collected physiological and psychological data for bus drivers who drove on the improved routes (intervention) and for drivers who were assigned the normal routes (control). Their findings were published in the article "Hassles on the Job: A Study of a Job Intervention with Urban Bus Drivers" (Journal of Organizational Behavior, Vol. 20, pp. 199-208). Following are data, based on the results of the study, for the heart rates, in beats per minute, of the intervention and control drivers.
a. At the significance level, do the data provide sufficient evidence to conclude that the intervention program reduces mean heart rate of urban bus drivers in Stockholm? (Note; , and .
b. Can you provide an explanation for the somewhat surprising results of the study?
c. Is the study a designed experiment or an observational study? plain your answer.
The intent is to employ the sample data to perform a hypothesis test to compare the means of the two populations from which the data were obtained. In each case, decide which of the procedures should be applied.
Paired: .
Faculty Salaries. Suppose, for example, you want to decide whether the mean salary of faculty in private institutions is greater than the mean salary of faculty in public institutions. State the null and alternative hypotheses for that hypothesis test.
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