The average monthly electric bill of a random sample of 256 residents of a city is $90 with a standard deviation of $24

a. Construct a 90% confidence interval for the mean monthly electric bills of all residents.
b. Construct a 95% confidence interval for the mean monthly electric bills of all residents.


a. 87.5325 to 92.4675
b. 87.06 to 92.94

Business

You might also like to view...

According to Frederick W. Taylor, father of scientific management, management and labor must operate independently to achieve the maximum good for society.

Answer the following statement true (T) or false (F)

Business

______ touch demonstrates platonic affection and support.

a. Love/intimate b. Social/polite c. Functional/professional d. Friendship/warmth

Business

The costs generated by the cost management systems are used to

a. assess product/service profitability. b. establish prices for products having a significant amount of competition. c. determine why variances occurred. d. all of the above.

Business

Which of the following is the first step in the process of determining an internal job structure?

A. assessing value B. job evaluation C. job analysis D. determining compensable factors E. factor weighting

Business