You would like to construct a 90% confidence Interval to estimate today's population mean temperature, so you make a series of measurements (a random Espanol sample) throughout the day. The mean of these measurements is 64 degrees Fahrenheit, and their standard deviation is 4 degrees Fahrenheit. (a) What is the best point estimate, based on the sample, to use for the population mean? X ? degrees OO (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. ED (In the table, Z refers to a standard normal distribution, and / refers to a t distribution.) Could use Sampling scenario Z t Unclear either Z or t The sample has size 100, and it is from a non-normally X 3 ? O O O O distributed population. The sample has size 14, and it is from a normally distributed population with an unknown standard deviation. The sample has size 13, and it is from a normally distributed O O population with a known standard deviation of 4. Check Save For Later Submit Assignment