Two assignments

MA215 Business Statist… Week 6 “Hypot…

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Due Date

Tuesday, April 23, 2019

11:59 PM

Points Possible

100

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A S S I G N M E N T I N F O R M A T I O N

Business Statistics

Week 6 Assignment

1. Formulate the hypotheses that can be used to determine whether the mean of all account balances is significantly different from $4000.

2. Compute the test statistic. How do you know if you should use z or t?

3. Conduct a hypothesis test. Include all steps of hypothesis testing. Using the p-value approach, what is your conclusion? Let α = .05. If you are using computer programs, you must go beyond running the program and providing the printout. You must pull out only the relevant information based on things like if this is a one-tail vs. two-tail test.

1. We want to determine whether or not the proportions of voters favoring the Democratic candidate were the same in both states. Conduct a full hypothesis test (all steps, p value approach) at 90% confidence.

1. Develop an interval estimate for the difference between the average yearly incomes of the marketing managers in the East and West. Use α = 0.05.

2. At 95% confidence, conduct a full hypothesis test. Use the p- value approach to determine if the average yearly income of marketing managers in the East is significantly different from the West.

Grading Criteria Assignments Maximum Points

Meets or exceeds established assignment criteria 40

Demonstrates an understanding of lesson concepts 20

Clearly presents well-reasoned ideas and concepts 30

Uses proper mechanics, punctuation, sentence structure, and spelling

10

Total 100

Question 1 A sample of 25 account balances of a credit company showed an average balance of $4,450 with a standard deviation of $230.

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 700 400 Mississippi 900 525

Question 3

In order to estimate the difference between the 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 = $70,000 X= $71,500 S = 3000 S= 4000

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