Week 6 Assignment
Week 6 Assignment
Question 1
A sample of 81 account balances of a credit company showed an average balance of $1,200 with a standard deviation of $126.
- Formulate the hypotheses that can be used to determine whether the mean of all account balances is significantly different from $1,150.
- Compute the test statistic.
- Using the p-value approach, what is your conclusion? Let α = .05.
Question 2
During the recent primary elections, the democratic presidential candidate showed the following pre-election voter support in Alabama and Mississippi.
- We want to determine whether or not the proportions of voters favoring the Democratic candidate were the same in both states. Provide the hypotheses.
- Compute the test statistic.
- Determine the p-value; and at 95% confidence, test the above hypotheses.
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.
- 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.
- At 95% confidence, use the p-value approach and test 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 |