A random sample of 25 people is surveyed, and it was found that they spent an...

A random sample of 25 people is surveyed, and it was found that they spent an average of 32 hours a week watching TV. The standard deviation of their sample was 6 hours.

(a) Calculate a 95% confidence interval for the average number of hours spent watching TV per week (population mean µ - using two-tailed distribution).

(b) What is the 95% confidence interval for the single 26^th person to be surveyed?

(c) What is the 95% confidence interval (two-sided interval) such that at least 90% of the values in the population are inside this interval?

(d) What is a 95% confidence for the population variance σ²?

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orchestra answered 1 year ago

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