1. Use Table B to find the critical value t* that you would use for a confidence interval for a population mean M in each of the following situations.

(a) A 98% confidence interval based on a random sample of 26 observations

(b) A 99% confidence interval from an SRS of 85 observations.

2. A national poll of a random sample of 1,640 adults was carried out by Morning Consult. Each person reported how much they (or significant other) spent on an engagement ring. The histogram displays the results. Determine if the conditions for constructing a confidence interval for a mean have been met in this context.