A marketing company reported that the typical American spends a mean of 140 minutes per day accessing the Internet via a mobile device. In order to test the validity of this statement, you select a random sample of 30 individuals. The results for the time spent per day accessing the Internet via mobile device (in minutes) are stored in Times.xlsx Download Times.xlsx. You want to determine if the population mean time spent per day accessing the Internet via mobile device is statistically greater than 140 minutes at the 5% significance level.
Minutes
72
144
48
72
36
360
44
30
432
24
288
144
144
240
432
144
144
144
576
216
72
72
144
288
144
36
288
48
288
144
A marketing company reported that the typical American spends a
a. Specify the null hypothesis and the alternative hypothesis. Define the parameter of your interest and write the mathematical expressions of your hypotheses in terms of your parameter (Statements in English are NOT acceptable).
b. State Type I & II errors in plain English within the context of the problem.
c. Use StatTools to conduct the hypothesis test.
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- Copy and paste the report generated by StatTools.
- Report the p-value.
d. At the 5% significant level, provide the results of the test in plain English within the context of the problem (interpretation of "Reject"/"Don't Reject" in English).
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