Many people believe that the average number of Facebook friends is 125. The population standard deviation is 39.2. A random sample of 43 high school students in a particular county revealed that the average number of Facebook friends was 147. At ? = 0.01, is there sufficient evidence to conclude that the mean number of friends is greater than 125?
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Null hypothesis: The mean number of Facebook friends is not greater than 125. Alternative hypothesis: The mean number of Facebook friends is greater than 125. Show more…
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Many people believe that the average number of Facebook friends is 125. The population standard deviation is 39.2. A random sample of 43 high school students in a particular county revealed that the average number of Facebook friends was 147. At α = 0.01, is there sufficient evidence to conclude that the mean number of friends is greater than 125?
Adi S.
Many people believe that the average number of Facebook friends is $338 .$ The population standard deviation is 43.2 . A random sample of 50 high school students in a particular county revealed that the average number of Facebook friends was $350 .$ At $\alpha=0.05,$ is there sufficient evidence to conclude that the mean number of friends is greater than $338 ?$
Hypothesis Testing
z Test for a Mean
Many people believe that the average number of Facebook friends is 130. The population standard deviation is 38.2. A random sample of 50 high school students in a particular county revealed that the average number of Facebook friends was 162. At α = 0.05, is there sufficient evidence to conclude that the mean number of friends is greater than 130? State the critical value(s). Calculate the test value
David N.
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