I need help with a statistics problem

Statistics
Tutor: None Selected Time limit: 1 Day

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?

hypotheses, z value, z test value

reject null?

Nov 4th, 2015

Thank you for the opportunity to help you with your question!


We have ,mean m=130

Standard deviation of the population,d=38.2

Null Hypothesis:

Alternative Hypothesis:

Calculating the p value for the mean of m'= 162

z score;

The z test value is 5.9259

As the z score calculated is too high therefore we reject the null hypothesis and accept the alternative hypothesis.


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Nov 4th, 2015

what is the critical z score?

Nov 5th, 2015

is it true that the # of friends is greater than 130?

Nov 5th, 2015

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