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A simple random sample of 70 items resulted in a sample mean of 90. The population...

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Statistics

A simple random sample of 70 items resulted in a sample mean of90. The population standard deviation is

σ = 5.

(a)

Compute the 95% confidence interval for the population mean.(Round your answers to two decimal places.)

to

(b)

Assume that the same sample mean was obtained from a sample of140 items. Provide a 95% confidence interval for the populationmean. (Round your answers to two decimal places.)

to

(c)

What is the effect of a larger sample size on the intervalestimate?

A larger sample size provides a smaller margin of error

.A larger sample size does not change the margin oferror.    

A larger sample size provides a larger margin of error.

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