Reference no: EM132361780

Question

Remember, hypothesis tests follow a series of steps. They are not just a computer printout. Make sure if you use a computer printout, you identify which parts of the printout apply to the problem. All of the parts of the printout will NOT apply.

Question 1

A sample of 20 account balances of a credit company showed a mean customer balance of $4,200, but the marketing manager claimed that the mean balance for the population was $4410. The marketing manager did NOT have the population standard deviation, but the sample standard deviation was found to be $600. Use the p-value approach to conduct a full hypothesis test that can be used to determine whether the mean of all account balances is significantly different from $4410. Let α = .10.

Question 2

During the recent primary elections, the democratic presidential candidate showed the following pre-election voter support in Alabama and Mississippi.

State

Voters Surveyed

Voters in favor of Democratic Candidate

Alabama

710

352

Mississippi

915

480

We want to determine whether or not the PROPORTIONS of voters favoring the Democratic candidate were the same in both states. In other words, is the first proportion (p1) the same as (p2)? Use the p-value approach. At 95% confidence, conduct a full hypothesis test.

Question 3

In order to estimate the difference between the MEAN yearly incomes of marketing managers in the East and West of the United States, the following information was gathered.

East

West

n = 40

N = 42

X = $73,000

X= $71,500

S = 3500

S= 4000