An interpretation of the confidence interval

[Meet1209]

A random sample of 25 ten-year-old girls had a mean weight of 73.5 and a standard deviation of 10 pounds. Give the following information for a 95% confidence interval for the mean weight.


1. The value for Z or t and how you found it.
2. The confidence interval equation filled in.
3. The calculation of the Standard Error
4. The calculation of the Margin of Error
5. The upper and lower limits
6. An interpretation of the confidence interval

 

[Dr.Peterson]

A random sample of 25 ten-year-old girls had a mean weight of 73.5 and a standard deviation of 10 pounds. Give the following information for a 95% confidence interval for the mean weight.

1. The value for Z or t and how you found it.
2. The confidence interval equation filled in.
3. The calculation of the Standard Error
4. The calculation of the Margin of Error
5. The upper and lower limits
6. An interpretation of the confidence interval

Are you expecting us to do all the work for you? In order to help, we need to see where you need help, which means seeing your attempt or specific questions about it. Have you at least decided yet whether to use z or t, and tried to find it?

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[Jacob]

To find the Value Z:

Draw a bell graph and divide 95/2. That will give you the probability and you should able to find the Z value by also the right-tail (p) value.

To find the t value:

df = n - 1 = 24. Look for 24 in your T-Distribution Table (df) column and right tail value (p) in row.