Saturday

April 18, 2015

April 18, 2015

Posted by **Anige** on Sunday, June 5, 2011 at 1:25pm.

- statistics -
**MathGuru**, Monday, June 6, 2011 at 8:13pmFormula:

CI95 = mean + or - (1.96)(sd)/√n

Mean = (23100 + 24900)/2 = 24000

Standard deviation = 5808.26

CI95 = 24000 + or - 900 --> gives you confidence interval of 23100 to 24900.

Therefore:

900 = (1.96)(sd)/√n

900 = (1.96)(5808.26)/√n

Solve for n. Round n to whole number.

I hope this will help.

**Answer this Question**

**Related Questions**

statistics - what are the mean and standard deviation of a sampling distribution...

statistics - A simple random sample of 60 items resulted in a sample mean of 80...

Statistics (42) - A simple random sample of 60 items resulted in a sample mean ...

Statistics - Which of the following statements correctly interprets a 95% ...

Statistics - 1. A study of 40 people found that they could do on the average15 ...

Statistics - For sample mean x = 150, sample size n = 36 and sample standard ...

statistics - An IQ is designed so that the mean is 100 and the standard ...

statistics - Determine the 90% confidence interval for a sample, taken from a ...

statistics - Determine the 90% confidence interval for a sample, taken from a ...

statistics - Sample with size n = 100 has mean = 30. Assuming the population ...