Exam
Name___________________________________

MULTIPLE CHOICE.  Choose the one alternative that best completes the statement or answers the question. 

Solve the problem. 

1) 

The overnight shipping business has skyrocketed in the last ten years. The single greatest predictor of a company's success is customer service. A study was conducted to determine the customer satisfaction levels for one overnight shipping business. In addition to the customer's satisfaction level, the customers were asked how often they used overnight shipping. The results are shown below in the following table 

A customer is chosen at random. Given that the customer uses the company more than five times per month, what is the probability that the customer expressed medium satisfaction with the company? 

1) 

_______ 

A) 

B) 

C) 

D) 

 

2) 

Each manager of a corporation was rated as being either a good, fair, or poor manager by his/her boss. The manager's educational background was also noted. The data appear below

	Educational Background

What is the probability that a randomly chosen manager is either a good managers or has an advanced degree? 

2) 

_______ 

A) 

B) 

C) 

D) 

 

Provide an appropriate response. 

3) 

A physical fitness association is including the mile run in its secondary-school fitness test. The time for this event for boys in secondary school is known to possess a normal distribution with a mean of 450 seconds and a standard deviation of 60 seconds. Find the probability that a randomly selected boy in secondary school can run the mile in less than 312 seconds. 

3) 

_______ 

A) 

0.9893 

B) 

0.0107 

C) 

0.5107 

D) 

0.4893 

4) 

A salesman for Monsanto boasts to Dr  Carson that his new fertilizer will increase the yield of  crops by 15%.  Dr Carson wishes to test the effects of the new fertilizer on her corn yield.  She has four equal sized plots of land—one with sandy soil, one with rocky soil, one with clay-rich soil, and one with average soil.  She divides each of the four plots into three equal sized portions and randomly labels them A, B and C.  The four A portions are treated with her old fertilizer.  The four B portions are treated with the new fertilizer. The four C portions receive no fertilizer.  At harvest time, the corn yield is recorded for each section of land.  What is the claim she is testing? 

4) 

_______ 

A) 

The new fertilizer yielded at least a 15% improvement. 

B) 

The average soil field had at least a 15% increase in yield. 

C) 

The total yield increased at least 15%. 

D) 

The A sections had at least a 15% increase in yield. 

5) 

A medical journal published the results of an experiment on anxiety. The experiment investigated the effects of a controversial new therapy for anxiety. Researchers measured the anxiety levels of 92 adult women who suffer moderate conditions of the disorder. After the therapy, the researchers again measured the women's anxiety levels. The differences between the the  and  anxiety levels were reported. What is the response variable in this experiment? 

5) 

_______ 

A) 

the therapy 

B) 

the disorder (anxiety or no anxiety) 

C) 

the 92 adult women who suffer from anxiety 

D) 

the differences between the the pre- and post-therapy anxiety levels 

 

1) 

A 

2) 

B 

3) 

B 

4) 

A 

5) 

D