You would like to construct a 90% confidence interval to estimate the population mean score on a nationwide examination in finance, and for this purpose we choose a random sample of exam scores. The sample we choose has a mean of 510 and a standard deviation of 73.

(a) What is the best point estimate, based on the sample, to use for the population mean?

(b) For each of the following sampling scenarios, determine which distribution should be used to calculate the critical value for the 90% confidence interval for the population

mean.

(In the table, Z refers to a standard normal distribution, and t refers to a t distribution.)

You would like to construct a 90% confidence interval to estimate the population mean score on a nationwide examination in finance, and for this purpose we choose a randorn sample of exarn scores. The sample we choose has a mean of 510 and a standard devation of 73 . (a) What is the best point estimate, based on the sample, to use for the popilation mean? (b) For each of the following sampling scenarios, determine which distrbution should be used to calculate the critical value for the 9056 confidence interval for the popilation mean. (Ze the table, Z. refers to a standard notmal diatribution, and t refers to a f dutribution.) b) For each of the following sampling scenarios, determine which distribution should be used to calculate the critical value or the 90% confidence interval for the population mean. In the table, Z refers to a standard normal distribution, and t refers to a t distribution.)