5. A class survey in a large class for first-year college students asked, "About how many minutes do you study on a typical weeknight?" The mean response of the 225 students was x = 160 minutes and the standard deviation was s = 46 minutes.

5(a). Construct 95% confidence interval for the population mean. Round you values to the nearest whole numbers.

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6(a). Which of these confidence intervals would be the narrowest?

- A 90% confidence interval for population mean, based on a sample of size 300.

- A 95% confidence interval for population mean, based on a sample of size 300.

- A 95% confidence interval for population mean, based on a sample of size 100.

- A 90% confidence interval for population mean, based on a sample of size 100.

6(b). Which of these confidence intervals would be the widest?

- A 90% confidence interval for population mean, based on a sample of size 300.

- A 95% confidence interval for population mean, based on a sample of size 300.

- A 95% confidence interval for population mean, based on a sample of size 100.

- A 90% confidence interval for population mean, based on a sample of size 100.