A major department store chain is interested in estimating the ...

[bobbysung]

A major department store chain is interested in estimating the mean amount its credit card customers spent on their first visit to the chain's new store in the mall. Fifteen credit card accounts were randomly sampled and analyzed with the following results: X = 50.50 and S = 20. Construct a 95 confidence interval for the mean amount its credit card customers spent on their first visit to the chain's new store in the mall assuming that the amount spent follows a normal distribution.
 
  A) 50.50  11.00 B) 50.50  10.12 C) 50.50  11.08 D) 50.50  9.09

Question 2

The amount of time necessary for assembly line workers to complete a product is a normal variable with a mean of 15 minutes and a standard deviation of 2 minutes. So, 15 of the products require more than ________ minutes for assembly.
 
  Fill in the blank(s) with correct word

[Eazy416]

Answer to Question 1

C

Answer to Question 2

17.0729 using Excel or 17.08

[bobbysung]

Excellent

[T4T]

Thanks for the timely response, appreciate it