Suppose nine items are sampled from a normally distributed population with a mean of

104

and a standard deviation of

24.

The nine randomly sampled values are shown in the table.

107	78	46	67	108
127	78	57	69

Calculate the probability of getting a sample mean that is smaller than the mean for these nine sampled values.

The probability that a sample mean is smaller than the mean for these nine values is

enter your response here.

(Round to four decimal places as needed.)

2.

For each of the following situations, indicate what type of data collection method you would recommend and discuss why you have made that recommendation.

a. collecting data on the percentage of peoplewhousecellphoneswhiledriving

b. collecting data on the price of

slicedhamatdelis

in the state

c. collecting data on customer satisfaction with the service provided by amajorretailoutlet

a. Choose the correct answer below.

A.

The data should be collected by personal interviews so that the questions can be properly interpreted by the interviewer.

B.

The data should be collected by telephone or written surveys because they are the cheapest and easiest methods.

C.

The data should be collected with direct observation so that the data collected are accurate.

D.

The data should be collected by experiment so that both internal and external validity can be controlled.

b. Choose the correct answer below.

A.

The data should be collected by personal interviews so that the questions can be properly interpreted by the interviewer.

B.

The data should be collected with direct observation so that the data collected are more accurate.

C.

The data should be collected by telephone or written surveys because they are the cheapest and easiest methods.

D.

The data should be collected by experiment so that both internal and external validity can be controlled.

c. Choose the correct answer below.

A.

The data should be collected by telephone or written surveys because they are the cheapest and easiest methods.

B.

The data should be collected by personal interviews so that the questions can be properly interpreted by the interviewer.

C.

The data should be collected by experiment so that both internal and external validity can be controlled.

D.

The data should be collected with direct observation so that the data collected are more accurate.