Provide an appropriate response.Before opening a new dealership, an auto manufacturer wants to gather information about car ownership and driving habits of the local residents. The marketing manager of the company randomly selects 1000 households from all households in the area and mails a questionnaire to them. Of the 1000 surveys mailed, she receives 145 back. Is this study biased? Explain.
What will be an ideal response?
Answers may vary. Selected individuals may be unavailable or choose not to respond. Such nonrespondents do not have the same likelihood of being included, hence creating a bias.
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Solve the problem.Find the common difference of an arithmetic sequence if the first term is 3 and the 8th term is 31.
A. -28 B. 28 C. -4 D. 4
Solve the problem.Sketch a graph showing the distance (in miles) that a person is from home after x hours if that individual drives at 30 mph to a lake 60 miles away, stays at the lake 1.5 hours, and then returns home at a speed of 60 mph. 
A. 
B. 
C. 
D. none of these
An amount of money deposited in a savings account grows at a rate proportional to the amount present. (It can be shown that an amount of money grows in this manner if it earns interest compounded continuously.) Suppose $50,000 is deposited in a fixed account earning interest at the rate of 8%/year compounded continuously. ? What is the accumulated amount after 6 yr? Round the answer to the nearest cent. ? $__________ ? How long does it take for the original deposit to double in value? Round the answer to the nearest tenth, if necessary. ? __________ yr
What will be an ideal response?
Solve the problem.Find the percent of the area under the standard normal curve between 
and 
A. 0.93% B. 90.4% C. 95.3% D. 90.7%