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# Devry Math 221 Week 6 Homework - Latest

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DeVry MATH 221 Week 6 Homework - Latest
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MATH 221 Homework Week 6 -2015

1   Given the same sample statistics, which level of confidence would produce the widest confidence interval?

1. 90%
2. 98%
3. 99%
4. 95%

1. Given the same sample statistics, which level of confidence would produce the widest confidence interval?
1. 99%
2. 95%
3. 98%
4. 90%

Use the values on the number line to find the sampling error.
The sampling error is 1.56

2. Use the values on the number line to find the sampling error.

The sampling error is 1.69

3   Find the margin of error for the given values of c, s, and n.
C=0.90, s=3.4, n=81

E= 0.621 (Round to three decimal places as needed)

• Find the margin of error for the given values of c, s, and n.
C=0.90, s=3.6, n=81

E= .658 (Round to three decimal places as needed)

• Construct the confidence interval for the population mean µ.
A 98% confidence interval for µ is (5.95,6.45) (Round to two decimal places as needed)

4   Construct the confidence interval for the population meanµ.

A 98% confidence interval for µ is (7.04,7.16),   (Round to two decimal places as needed)

• Construct the confidence interval for the population mean µ.

A 90% confidence interval for µ is (15.5,17.9). (Round to one decimal place as needed)

5   Construct the confidence interval for the population mean µ.

A 98% confidence interval for µ is (15.1,16.5). (Round to one decimal place as needed)

6   Use the confidence interval to find the estimated margin of error.   Then find the sample mean.
A biologist reports a confidence interval of (4.3,5.1) when estimating the mean height (in centimeters) of a sample of seedlings....