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In this problem the number of customers is given 300.
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Meant time spent on internet per week is 7 .2 hours and we have to find solution to the following problems.
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Let us start with the party where we have to find the parameter of interest.
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So the parameter of interest in this problem is the average time spent on internet per week by the population and it is denoted by mew.
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So this is the answer to part a.
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Moving to the next part, that is b, we have to find the sample.
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And the sample here is the 300 customers.
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And this is the answer to part b.
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Next in the part c, we are required to create a 95 % confidence interval.
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And for that, the standard is.
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Error that is also given by sigma divided by square root of n is given in the problem to be 0 .458...