Tuesday

January 27, 2015

January 27, 2015

Posted by **PK** on Tuesday, February 21, 2012 at 4:28pm.

a.) Calculate the standard error of the mean if you draw a random sample of 50 test scores. Show your work for full credit . . .

b.) Your sample mean is calculated to be 77. Compute the 95% confidence interval for the mean. Show your work!

c.) Interpret the meaning of the 95% confidence interval in one sentence.

- statistics -
**MathGuru**, Tuesday, February 21, 2012 at 4:49pmHere are a few hints to get you started:

a). Standard error of the mean = standard deviation divided by the square root of the sample size

b). CI95 = mean ± 1.96(sd/√n)

...where ± 1.96 represents the 95% interval using a z-table, sd = standard deviation, and n = sample size

c). You are 95% confident that the population mean is within the interval.

**Answer this Question**

**Related Questions**

statistics - Suppose that the population standard deviation (ó) for a normally ...

Statistics - In an essay of 250-500 words, thoroughly address the following ...

statistics - An IQ test was administered to a random sample of 26 mental ...

Business Statistics - In a goodness-of-fit test, the null hypothesis states that...

Statisitcs - The mean height of fully grown birch trees are 18 feet with a ...

statistics - The scores on a national achievement test are normally distributed ...

statistics - Given a sample size of 38, with sample mean 660.3 and sample ...

statistics - How do we compute sample size fluctuations? Suppose we have a ...

Statistics - hi i need help calculating the standard error using the central ...

statistics - Scores on a national writing exam are approximately normally ...