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In a random sample of 23 people aged 18-24, the mean amount of time spent using...

In a random sample of 23 people aged 18-24, the mean amount of time spent using the internet is 45.1 hours per month with a standard deviation of 28.4 hours per month. Assume that the amount of time spent using the internet in this age group is normally distributed.

1. if one were to calculate a confidence interval for the population mean, would it be a z or t confidence interval? use the flow chart to explain your answer.

2. Find a 95% confidence interval for the mean number of hours/month spent using the internet for all people aged 18-24.

3. interpret the interval from problem 2.

4. suppose that the mean amount of time spent using the internet for all people aged 40-50 is 30 hours/month. Do you believe with 95% confidence that the mean for all 18-24 year olds could be 30 hours/month? Explain your answer.

work and answers for all 4 please & thanks
Math   Statistics-And-Probability   
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