Pre-Algebra Practice Test: DATA ANALYSIS

Define the terms below:

1. interquartile range

2. outlier

3. mean

4. You want to make a stem-and-leaf plot of the following data: 24, 44, 31, 42, 26, and 37. What numbers would you use as stems?

5. Make a stem-and-leaf plot to show the prices (in dollars) of coats sold at a local store. Prices of Coats (in dollars) 38, 45, 45, 53, 63, 65, 30, 51, 54, 42, 66

Pre-Algebra Practice Test Data Analysis Page 1 of 5 Pre-Algebra Practice Test Data Analysis Page 2 of 5 6. The data below shows the number of minutes players on a baseball team spent in batting practice. Time Spent in Batting Practice (in minutes) 15, 22, 31, 12, 23, 37, 31, 21, 21, 11

Which stem-and-leaf plot accurately displays the data?

A StemLeaf11 1 5 21 B StemLeaf11 2 5 21 . 1 2 3 31 1 7 . 1 2 3 31 1 7 Key: 3|1 = 31min Key: 3|1 = 31min

C StemLeaf11 2 5 20 D StemLeaf11 2 5 21 . 1 2 3 31 1 7 . 2 2 3 31 1 7 Key: 3|1 = 31min Key: 3|1 = 31min

7. The table is the start to a frequency table for ScoresTallyFrequency9994918987827776656 the test scores in a math class. Complete the 1 table.

Make a histogram for the data.

Pre-Algebra Practice Test Data Analysis Page 3 of 5 Use the plot below for questions #8 and #9.

< > 25 30 35 40 45 50 55 60

8. What is the interquartile range?

9. What percent of the data falls between 25 and 50?

10. The box-and-whisker plots below show the average monthly temperatures for City A and City B. What 2 conclusions can you make?

Average Temperatures

City A

City B < > 20 30 40 50 60 70 80 90

11. A store has watches at the following prices. Make a box-and-whisker plot for the data. Show all work. Prices of Watches (in dollars) 15 18 19 20 31 33 41 45 57 62 71 80 80 81 110

12. Refer to problem #11. If all watches under $20 are on sale, what fraction of the watches are on sale?

Pre-Algebra Practice Test Data Analysis Page 4 of 5 Here are the scores for a school basketball team: 47, 68, 50, 34, 64, 47, and 54. 13. Find the mean

14. Find the mode

15. Find the median

16. Find the range.

17. A survey finds that 140 families in a random sample of 700 families in a town own an HD television. The town has 5000 families. Predict how many families in the town own an HD television. Show your work.

18. A school has 1200 students. A survey of a random sample of 100 students found the 30 students have part-time jobs. The survey has a margin of error of ±3%. Find the interval in which the total number of students who have part-time jobs is likely to lie.

19. The chart shows prices for two different types of potatoes. The pattern of prices continues for heavier bags. Bag Weight Potato A Potato B 10 lb $2.50 $3.75 15 lb $4.00 $5.00 20 lb $5.50 $6.25 25 lb $7.00 $7.50 What is the cost of a 40 lb bag of Potatoes B?

20. What is misleading about the display of data in the histogram?

Pre-Algebra Practice Test Data Analysis Page 5 of 5