Introduction to the Practice of Statistics 9th edition by David S. Moore Test bank

 A)Your friend must not have followed the diet correctly because she did not lose weight.
 B)Because your friend did not lose weight, the report must not be correct.
 C)The report gives only the average. This does not imply that all participants in the study lost 10.4 pounds or even that all participants lost weight. Your friend's experience does not necessarily contradict the study results.
 D)In order for the study to be correct, we must now add your friend's results to those of the study and recalculate the new average.
 
 
107.The ages (to the nearest year) of the 667 people participating in a large workshop are summarized as shown below.
 
Age181920212223242532
Number of students1412020020090301021
 
What is true about the median age?
 A)It could be any number between 19 and 20.
 B)It must be 20.
 C)It must be 21.
 D)It must be over 21.
 
 
108.As part of a large ongoing study on the treatment of women with breast cancer, the treatment time (in months) of eight patients whose lymph nodes were cancer-free is recorded. Treatment time is defined as the time from the moment the cancer treatment starts until the patient is declared cancer-free.
 
 9.478.6019.3316.338.509.4017.679.30
 
What is the mean treatment time for these eight women?
 A)10.5 months
 B)11.67 months
 C)12.325 months
 D)15 months
 
 
109.The median age of five people in a meeting is 30 years. One of the people, whose age is 50 years, leaves the room. What is the median age of the remaining four people in the room?
 A)40 years
 B)30 years
 C)25 years
 D)This cannot be determined from the information given.
 
 
110.The Environmental Protection Agency records data on the fuel economy of many different makes of cars. Some of the variables they collect are listed below. Identify each variable as categorical or quantitative.
A)     Manufacturer of the car (Nissan, Ford, Toyota, etc.)
B)     Mileage of the car (miles per gallon)
C)     Weight of the car (in pounds)
D)     Size of the car (small, medium, full-size, pick-up truck, etc.)
 
 
111.The Environmental Protection Agency records data on the fuel economy of many different makes of cars. Data on the mileage of 20 randomly selected cars are listed below. The values are ordered for convenience.
 
12131516161718181919
20202223242626272729
 
What is the median mileage for these 20 cars?
 A)17.5 miles per gallon
 B)19 miles per gallon
 C)19.5 miles per gallon
 D)20 miles per gallon
 
 
112.The Environmental Protection Agency records data on the fuel economy of many different makes of cars. Data on the mileage of 20 randomly selected cars are listed below. The values are ordered for convenience.
 
12131516161718181919
20202223242626272729
 
If the value 29 were misrecorded and should really be 21, what would the median mileage be for these 20 cars?
 A)It would change to 20 miles per gallon.
 B)It would stay the same.
 C)It would change to 21 miles per gallon.
 D)We cannot determine this from the given information.
 
 
113.The Environmental Protection Agency records data on the fuel economy of many different makes of cars.  Data on the mileage of 20 randomly selected cars are listed below. The values are ordered for convenience.
 
12131516161718181919
20202223242626272729
 
What is the interquartile range for the mileage data?
 A)8.5 miles per gallon
 B)16.5 miles per gallon
 C)17 miles per gallon
 D)25 miles per gallon
 
 
114.A set of midterm exam scores has a median that is much larger than the mean.Which of the following statements is most consistent with this information?
 A)A stemplot of the data would be symmetric.
 B)A stemplot of the data would be skewed left.
 C)A stemplot of the data would be skewed right.
 D)The data set must be so large that it would be better to draw a histogram rather than a stemplot.
 
 
115.A consumer agency is testing appliances for a series of articles in their magazine. Currently they are working with cooktops and ranges. They have selected 16 of the most commonly used models. Using a series of tests, the agency will estimate the lifetime of these models. A histogram of these (estimated) lifetimes is shown below.
 

 
Answer each of the following questions with yes, no, or can't tell.