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1. As a class project, each of 240 students taking E270 is required to obtain a sample of n = 100 students and build a 95% confidence interval for the distance traveled to the campus. The instructor thus receives 200 different interval estimates. The instructor would expect _____ of these intervals to contain the population mean distance traveled.
a. 220
b. 228
c. 190
d. 95
2. Given the above sample data, the lower and upper end of a 95% interval estimate of the mean commuting time of all IUPUI students is... L=_____ and U=______ minutes
a. 9.8 35.0
b. 10.6 34.2
c. 11.8 33.0
d. 14.9 29.9
3. To obtain a 95% interval estimate for the mean student commuting time to the IUPUI campus with a margin of sampling error of MOE = 2 minutes, the minimum sample size should be n = _____. A pilot sample of students provided a planning value of σ^ = 9 minutes for the standard deviation.
a. 82
b. 78
c. 62
d. 55
4. To build a 95% confidence interval, with a margin of error of MOE = 0.03, for the population proportion of IUPUI undergraduates who plan to go to graduate school, the minimum sample size is n = _____. Use a planning value of π^ = 0.30.
a. 1005
b. 920
c. 897
d. 820
If we wish to be 95% certain of avoiding a Type I error, use these data to examine differences in the average distance traveled to the two clinics.
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