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Week 6: Confidence Interval
| Week | Assignments | Due Date |
| Week 6 | Graded Discussion | Suggested Due Date—
Initial Post: Wednesday of Week 6
Due Date— Responses: Sunday of Week 6 [Have two posts on two different days] |
| Knewton Homework Assignments
Confidence Interval for Mean – Population Standard Deviation Known Confidence Intervals – Empirical Rule Estimating Sample Size for a Population Proportion Point Estimates, Margins of Error, and Confidence Intervals Understanding Confidence Intervals – Excel |
Sunday of Week 6 | |
| Week 6 Quiz |
—————-
Week 6 Assignment – Estimating Sample Size for a Population Proportion
Activity 1
Question
Suppose an automotive repair company wants to determine the current percentage of customers who keep up with regular vehicle maintenance. How many customers should the company survey in order to be 95% confident that the estimated (sample) proportion is within 4 percentage points of the true population proportion of customers who keep up with regular vehicle maintenance?
| z0.10 | z0.05 | z0.025 | z0.01 | z0.005 |
| 1.282 | 1.645 | 1.960 | 2.326 | 2.576 |
Use the table of values above.
Select the correct answer below:
Answer
Access the entire solutions for this week (top graded solutions) by clicking the ‘Buy’ button.
Activity 2
Question
Suppose a clothing store wants to determine the current percentage of customers who are over the age of forty. How many customers should the company survey in order to be 98% confident that the estimated (sample) proportion is within 2 percentage points of the true population proportion of customers who are over the age of forty?
| z0.10 | z0.05 | z0.025 | z0.01 | z0.005 |
| 1.282 | 1.645 | 1.960 | 2.326 | 2.576 |
Use the table of values above.
Select the correct answer below:
Answer
Access the entire solutions for this week (top graded solutions) by clicking the ‘Buy’ button.
Activity 3
Question
Suppose an automotive repair company wants to determine the current percentage of customers who keep up with regular vehicle maintenance. How many customers should the company survey in order to be 95% confident that the estimated (sample) proportion is within 2 percentage points of the true population proportion of customers who keep up with regular vehicle maintenance?
| z0.10 | z0.05 | z0.025 | z0.01 | z0.005 |
| 1.282 | 1.645 | 1.960 | 2.326 | 2.576 |
Answer
Access the entire solutions for this week (top graded solutions) by clicking the ‘Buy’ button.
Activity 4
Question
Suppose an automotive repair company wants to determine the current percentage of customers who keep up with regular vehicle maintenance. How many customers should the company survey in order to be 90% confident that the estimated (sample) proportion is within 2 percentage points of the true population proportion of customers who keep up with regular vehicle maintenance?
| z0.10 | z0.05 | z0.025 | z0.01 | z0.005 |
| 1.282 | 1.645 | 1.960 | 2.326 | 2.576 |
Answer
Access the entire solutions for this week (top graded solutions) by clicking the ‘Buy’ button.
Activity 5
Question
Suppose a clothing store wants to determine the current percentage of customers who are over the age of forty. How many customers should the company survey in order to be 92% confident that the estimated (sample) proportion is within 3 percentage points of the true population proportion of customers who are over the age of forty?
| z0.10 | z0.05 | z0.025 | z0.01 | z0.005 |
| 1.282 | 1.645 | 1.960 | 2.326 | 2.576 |
Answer
Access the entire solutions for this week (top graded solutions) by clicking the ‘Buy’ button.
Activity 6
Question
Suppose a shoe store wants to determine the current percentage of customers who are males. How many customers should the company survey in order to be 98% confident that the estimated (sample) proportion is within 3 percentage points of the true population proportion of customers who are males?
| z0.10 | z0.05 | z0.025 | z0.01 | z0.005 |
| 1.282 | 1.645 | 1.960 | 2.326 | 2.576 |
Answer
Access the entire solutions for this week (top graded solutions) by clicking the ‘Buy’ button.
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