AMDM

Circle the BEST answer.
1. An example of a quantitative variable is the horsepower of a car.
-190500104140True
00True

False
-190500206375True
00True
2. An example of a qualitative variable is the make of a car.
    False
-171450153670 True
00 True
3. In an observational study, the variable of interest is called a response variable.True     False
609600256539False aaFalse
00False aaFalse4. In an experimental study, the aim is to manipulate or set the value of the response variable.True     False
5. Which of the following is NOT a qualitative variable?A. The make of a TVB. A person’s genderC. Mileage of a carD. Whether a person is a college graduate
209550211455 E
00 E
E.  Whether a person has a charge account
left1676400 EEEE
00 EEEE
6. Which of the following is not a categorical variable? A. Air TemperatureB. Bank Account BalanceC. Daily Sales in a StoreD. Whether a Person Has a Traffic Violation Answers A, B, and C
7. A study is being conducted on the effect of gas price on the number of miles driven in a given month. Residents in two cities, one on the east coast and one on the west coast are randomly selected and asked to complete a questionnaire on the type of car they drive, the number of miles they live from work, the number of children under 18 in their household, their monthly income and the number of miles they have driven over the past 30 days.

List the response variable(s).
Response variable in this study is the number of miles driven in last 30 days.
8. A study is being conducted on the effect of gas price on the number of miles driven in a given month. Residents in two cities, one on the east coast and one on the west coast are randomly selected and asked to complete a questionnaire on the type of car they drive, the number of miles they live from work, the number of children under 18 in their household, their monthly income and the number of miles they have driven over the past 30 days. Is this an experimental or observational study?
Observational study
9. Using the following data table of the average hours per week spent on internet activities by 15-18 year olds for the years 1999-2008, construct the runs plot and interpret. 

In the past, eight in the number of hours spent on the Internet have increased. But for the past three years it has been levelling.
10. 822 customers were randomly selected from those who had recently bought a book over the internet. The chart below shows the breakdown of the classification of the book type:  What percentage of the books purchased were either sci-fi/fantasy or biographies? ___22.01%___________
Show your work to receive ANY credit
Total number of customers are 822
Sci-fi/fantasy books are 147
Biographies 34
(147+34)/822*100% = 22.01%
11. Recently an advertising company called 200 people and asked to identify the company that was in an ad running nationwide. The following results were obtained:  What percentage of those surveyed were male OR could recall the company? __58%___________
Show your work to receive ANY credit
Those who recalled the company correctly were 116
Total surveyed people were 200
Percentage is 116/200*100%
=58%
12. The number of items rejected daily by a manufacturer because of defects for the last 30 days are:20, 21, 8, 17, 22, 19, 18, 19, 14, 17, 11, 6, 21, 25, 4, 19, 12, 22, 19, 16, 10, 28, 24, 6, 21, 20, 25, 5, 17, 8Complete this frequency table for these data
Frequency Relative Freq. Percent Cumulative Freq. Percent
4<10 5 0.167 0.167
10<15 6 0.200 0.367
15<19 6 0.200 0.567
19<24 9 0.300 0.867
24<29 4 0.133 1.00

13/14/15/16/17. The local amusement park was interested in the average wait time at their most popular roller coaster at the peak park time (2 p.m.). They selected 12 patrons and had them get in line between 2 and 3 p.m. Each was given a stopwatch to record the time they spent in line. The times recorded were as follows (in minutes):
118, 108, 116, 99, 120, 138, 118, 129, 121, 45, 130, 118
For 13-17, …….Show your work +/or explain briefly how you did the calculation

13. What is the mean? __113.333_________
118+108+116+99+120+ 138+ 118+ 129+121+ 45+130+ 118=1360
Mean=1360/12=11314. What is the median? _118________
When it is arranged in ascending order it is false at the center.
15. What is the mode? ___118________
This is because it appears 3 times
16.What is the variance?__517.6__________
Taking the total which is and squaring it
118+108+116+99+120+ 138+ 118+ 129+121+ 45+130+ 118=13602
Minus the total of the square of each then divide by 12-1
17. What is the standard deviation? ____23.76______
The standard deviation is the square root of variance

18. A normal population has 99.73 percent of the population measurements within __two___ standard deviation(s) of the mean. A. OneB. TwoC. ThreeD. Four
19. The _______Z- score_____________ is a quantity that measures the variation of a population or sample relative to its mean. A. MeanB. Standard deviationC. RangeD. Coefficient of variationE. Z-score
-257175245110A
00A
20. Researchers generally would prefer their data to:
A. Have a large standard deviation
B. Have a small standard deviation
C. Have a small mean
D. Have a large mean