Question

A] this problem requires PhStat solution. A marketing researcher wants to estimate the mean amount spent ($) on Amazon.com by Amazon Prime member shoppers. Suppose a random sample of 100 Amazon Prime member shoppers who recently made a purchase on Amazon.com yielded a mean amount spent of $1,500 and a standard deviation of $200. 1. Using a 0.05 level of significance, state your decision.

2. Using the critical value approach, is there evidence that the population mean amount spent on Amazon.com by Amazon Prime member shoppers is less than $1,475?

3. Determine the p-value and interpret its meaning.

B] this problem requires PhStat solution.

The population mean waiting time to check out of a supermarket has been 4 minutes. Recently, in an effort to reduce the waiting time, the supermarket has experimented with a system in which infrared cameras use body heat and in-store software to determine how many lines should be opened. A sample of 100 customers was selected, and their mean waiting time to check out was 4.25 minutes with a sample standard deviation of 2.7 minutes.

1. State your decision rule.

2. What is your decision?

3. At 0.05 level of significance, using the critical value approach, is there evidence that the population mean waiting time to check out is greater than 4 minutes?

4. Determine p-value and interpret its meaning.

LEGIBLY PLEASE THANK YOU ;-]

Answer 1