We Are Social and Hootsuite reported that the typical American spends 2.02 hours (121 minutes) per day accessing the internet via mobile devices. In order to test the validity of this statement, you select a sample of 30 friends and family. The results for the time spent per day accessing the internet via mobile devices (in minutes) are stored in InternetMobileTime. a. Is there evidence that the population mean time spent per day accessing the internet via mobile devices is different from 121 minutes? Use the p -value approach and a level of significance of 0.05. b. What assumption about the population distribution is needed in order to conduct the t test in (a)? c. Make a list of the various ways you could evaluate the assumption noted in (b). d. Evaluate the assumption noted in (b) and determine whether the test in (a) is valid.
We Are Social and Hootsuite reported that the typical American spends 2.02 hours (121 minutes) per day accessing the internet via mobile devices. In order to test the validity of this statement, you select a sample of 30 friends and family. The results for the time spent per day accessing the internet via mobile devices (in minutes) are stored in InternetMobileTime. a. Is there evidence that the population mean time spent per day accessing the internet via mobile devices is different from 121 minutes? Use the p -value approach and a level of significance of 0.05. b. What assumption about the population distribution is needed in order to conduct the t test in (a)? c. Make a list of the various ways you could evaluate the assumption noted in (b). d. Evaluate the assumption noted in (b) and determine whether the test in (a) is valid.
Solution Summary: The author explains how to perform the t-test using Minitab.
We Are Social and Hootsuite reported that the typical American spends 2.02 hours (121 minutes) per day accessing the internet via mobile devices.
In order to test the validity of this statement, you select a sample of 30 friends and family. The results for the time spent per day accessing the internet via mobile devices (in minutes) are stored in InternetMobileTime.
a. Is there evidence that the population mean time spent per day accessing the internet via mobile devices is different from 121 minutes? Use the p-value approach and a level of significance of 0.05.
b. What assumption about the population distribution is needed in order to conduct the t test in (a)?
c. Make a list of the various ways you could evaluate the assumption noted in (b).
d. Evaluate the assumption noted in (b) and determine whether the test in (a) is valid.
Features Features Normal distribution is characterized by two parameters, mean (µ) and standard deviation (σ). When graphed, the mean represents the center of the bell curve and the graph is perfectly symmetric about the center. The mean, median, and mode are all equal for a normal distribution. The standard deviation measures the data's spread from the center. The higher the standard deviation, the more the data is spread out and the flatter the bell curve looks. Variance is another commonly used measure of the spread of the distribution and is equal to the square of the standard deviation.
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