1. What is an observation that does not seem to be in accord with the other values in the data?
2. A purchasing agent tests samples of 10 batteries for hand calculators from a certain manufacturer. Each battery is tested in a calculator that is programmed to do a continuous "loop" of typical calculations; the time in hours to failure of each battery is recorded in the table below.
11| 80, 91, 95 12| 00, 02, 03, 04, 07, 13, 20
1| 1.80, 1.91, 1.95, 2.00, 2.02, 2.03, 2.04, 2.07. 2.13, 2.20
1| 80, 91, 95 2| 00, 02, 03, 04, 07, 13, 20
11.8| 0 11.9| 1, 5 12.0| 0, 2, 3, 4, 7 12.1| 3 12.2| 0
3. From March 1981 to February 1983 the number of burglaries committed each month for a town in Georgia were recorded. They are given below.
4. Which of the following is a technique for improving a stemplot with very few stems but many leaves?
5. Which is the best option for the approximate center of the data represented in the following stemplot? 1| 6 2| 2 4 8 9 3| 0 1 1 2 3 4 5 6 7 8 4| 0 5 8 5| 0 1 8 6| 1
1| 6 2| 2 4 8 9 3| 0 1 1 2 3 4 5 6 7 8 4| 0 5 8 5| 0 1 8 6| 1
6. To which data set does the following stemplot correspond? 1| 6 2| 2 4 8 9 3| 0 1 1 2 3 4 5 6 7 8 4| 0 5 8 5| 0 1 8 6| 1
7. From March 1981 to February 1983 the number of burglaries committed each month for a town in Georgia were recorded. They are given below. Between months 12 and 13 a law was enacted requiring citizens to own a gun. Town officials felt this law might decrease the number of burglaries committed by acting to deter criminals.
8. What is the mean number of burglaries for months 1 to 12 only (i.e., those months before the law was enacted)?
9. For the data above, what is the mean number of burglaries for months 13 to 24 (i.e., those months after the law was enacted)?
10. A researcher reports that, on average, the participants in his study lost 10.4 lbs. after two months on his new diet. A friend of yours comments that she tried the diet for two months and lost no weight, so clearly the report was a fraud. Which of the following statements is correct?
11. What is the mean of the numbers 0, 4, 1, 50, 5?
12. The mean age of 2 people in a room is 20 years. A 50 year-old person enters the room. What is now the mean age of the 3 people in the room?
13. The Insurance Institute for Highway Safety publishes data on the total damage suffered by compact automobiles in a series of controlled, low-speed collisions. The following is a sample of the data in dollars, with brand names removed: 1000 600 800 1000
What is the mean?
14. The rental values (in dollars) of a sample of four available apartments close to the university are as follows: 470 600 580 550 What is the mean rental value of the four apartments?
15. The numbers of new projects started each month at an advertising agency for the last six months are as follows: 2 5 3 3 6 3 What is the mean number of projects started per month over the last six months?
16. What is the median of the numbers 0, 4, 1, 50, 5?
17. The Insurance Institute for Highway Safety publishes data on the total damage suffered by compact automobiles in a series of controlled, low-speed collisions. The following is a sample of the data in dollars, with brand names removed: 1000 600 800 1000
What is the median of this data?
18. A sample of production records for an automobile manufacturer shows the following figures for production per shift:
19. In a class of 100 students, the grades on a statistics test are summarized on the following frequency table:
20. A reporter wishes to portray baseball players as overpaid. Which measure of center should he report as the average salary of major league players?