A simple random sample of 60 items resulted in a sample mean of 90. The population standard deviation is 13.
1) Compute the 95% confidence interval for the population mean (to 1 decimal).
2) Assume that the same sample mean was obtained from a sample of 120 items. Provide a 95% confidence interval for the population mean (to 2 decimals).
3) What is the effect of a larger sample size on the margin of error?
Given
n=60
Sample mean = 90
population standard deviation = 13
1)
Compute the 95% confidence interval for the population mean
z value at 0.05 = 1.96
2)
Here
n = 120
3)
The margin of error decreases when the Sample size increases.
Given
n=60
Sample mean = 90
population standard deviation = 13
1)
Compute the 95% confidence interval for the population mean
z value at 0.05 = 1.96
2)
Here
n = 120
3)
The margin of error decreases when the Sample size increases.
A simple random sample of 60 items resulted in a sample mean of 90. The population...
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