91Ó°ÊÓ

The 95% confidence interval is:__________________.

Fill in the blanks on the graph with the areas, upper and lower limits of the confidence interval, and the sample mean.

In one complete sentence, explain what the interval means.

Using the same mean, standard deviation, and level of confidence, suppose that n were 69 instead of 25. Would the error bound become larger or smaller? How do you know?

Using the same mean, standard deviation, and sample size, how would the error bound change if the confidence level were reduced to 90%? Why?

Identify the following:

a. x=_______

b. sx =_______

c. n =_______

d. n – 1 =_______

Define the random variables$X$ and$\frac{}{x}$ in words.

Construct a $95\%$ confidence interval for the population mean weight of newborn elephants. State the confidence interval, sketch the graph and calculate the error bound.

Which distribution should you use for this problem?

Construct a $95\%$confidence interval for the population mean time spent waiting. State the confidence interval, sketch the graph, and calculate the error bound .