Question

7) Based on past data, the sample mean of the credit card purchases at a large department store is $45. µ=17 population standard deviation is 8.

a)               What % of samples are likely to have between 20 and 30?                                                                                                                _________,

b)             Between what two values 90% of sample means fall?            Formula__________________________                                  _________,

c)               Below what value 99% of sample means fall?                         Formula__________________________                                  _________,

d)              Above what value only 1% of sample means fall??               Formula__________________________                               _________,

e)               Within what symmetrical limits of the population percentage will 95% of the sample percentages fall?                               ________ _______

f)               Between what two values only 98% of sample means fall?

Answer 1