Question

The table below shows the results of a survey in

which 400 adults from the​ East, 400 adults from the​ South, 400 adults from the​ Midwest, and 400

adults from the West were asked if traffic congestion is a serious problem. Complete parts​ (a) and​ (b).

Adults who say that traffic congestion is a serious problem

East 37%

South 33%

Midwest 25%

West 54%

A) Construct a​ 99% confidence interval for the proportion of adults from the East who say traffic congestion is a serious problem.

The​ 99% confidence interval for the proportion of adults from the East who say traffic congestion is a serious problem is____

B)Construct a​ 99% confidence interval for the proportion of adults from the South who say traffic congestion is a serious problem.

The 99% confidence interval for the proportion of adults from the South who say traffic congestion is a serious problem is____

 

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Question

The grade point average for 12 randomly selected college students is shown below. complete parts a) through

c)

2.4,1.8,2.4,0.3,3.1,0.9,1.5,2.3,2.7,4.0,3.5,3.4

Assume the population is normally distributed.

a) find the sample mean.

b)Find the sample standard deviation.

c) Construct a 99% confidence interval for the population mean μ.

 

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