Pre-Algebra, Unit 11C Practice Test: DATA ANALYSIS

Name:

Date:

Define the terms below:

  1. interquartile range
  1. outlier
  1. mean
  1. 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?
  1. 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

  1. (CRT) Refer to problem number 5. What is the range of the prices of coats?

A. / 3
B. / 27
C. / 35
D. / 227
  1. (SE)The data below shows the number of minutes players on a baseball team spent in batting practice.

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

  1. (CRT)Twenty-five employees kept track of the number of minutes they spent online each day at work. The results are shown in the histogram below.

In which interval is the median for the number of minutes spent online?

A. / 1-20
B. / 21-40
C. / 41-60
D. / 61-80
  1. (CRT) Referring back to the histogram in problem 8, determine which conclusion about the number minutes employees spend online per day is supported by the information given.

A. / The median number of minutes spent online is 40.
B. / The range of the number of minutes spent online is 16.
C. / Most employees spend less than 20 minutes online per day.
D. / Most of the employees spent more than 40 minutes online per day.
  1. (CRT)Thinking of the histogram in problem 8, explain why the interval in which the mode(of the number of minutesspent online)cannot be identified.

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

Make a histogram for the data.

Use the plot below for questions #12- #14.

  1. (SE/CRT)What is the interquartile range?
  1. (SE)What percent of the data falls between 25 and 50?
  1. (CRT) What is the upper quartile value?
  1. The box-and-whisker plots below show the average monthly temperatures for City A and City B. What 2 conclusions can you make?
  1. (CRT)Students in a math class dept a record of the number of hours they spent on homework in one week. Their results are below. Create a box-and –whisker plot for the data. Be sure to include a title and axis label. Show your work.
  1. Refer to problem #16. What fraction of the students study more than 10 hours?
  1. (CRT) Below is a box-and-whisker plot that a student created for problem #16. The plot is NOT correct. Give one reason why it is not correct.

For problems 19-22, here are the scores for a school basketball team: 47, 68, 50, 34, 64, 47, and 54.

  1. (SE/CRT)Find the mean.
  1. (SE/CRT)Find the mode.
  1. (SE/CRT)Find the median.
  1. (SE/CRT)Find the range.
  1. A survey finds that 140 families in a random sample of 700 families in a town own anHD television. The town has 5000 families. Predict how many families in the town own an HD television. Show your work.
  1. 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.
  1. (SE/CRT)The chart shows prices for two different types of potatoes. The pattern of prices continuesfor heavier bags.

What is the cost of a 40 lb bag of Potatoes B?

  1. What is misleading about the display of data in the histogram?
  1. (CRT) A chef is purchasing food for a class he is going to teach. Below are the items (and their cost) that he placed in his shopping cart.

Food Purchase
Food Item / Cost of Each Item / Number of Items
Macaroni noodles (box) / $1.89 / 5
Cheese packets / $3.15 / 7
Parmesan cheese / $4.91 / 1

Which of these is the bestESTIMATE of the total cost of the food in the shopping cart?

A. / $5
B. / $10
C. / $35
D. / $40
  1. (CRT)The table below predicts the amount of time it takes to download a 10MB file through the internet.

Download Speed
(kilobits per sec) / Hours / Minutes
14.4 Kbps / 1 / 37.1
28.8 Kbps / 0 / 48.6
33.6 Kbps / 0 / 42.5
56.0 Kbps / ? / ?
64.0 Kbps / 0 / 21.9
128.0 Kbps / 0 / 10.9

Which is the best ESTIMATE of the amount of time it will take to download the file when the computer’s modem connection speed is 56.0 Kbps per second?

A. / 0 hours 43 minutes
B. / 0 hours 39.5 minutes
C. / 0 hours 25.0 minutes
D. / 0 hours 21 minutes

Long Term Memory Review

  1. (CRT) The probability of winning a game is. What are the odds in favor of winning the game?

A. /
B. /
C. /
D. /
  1. (CRT)Three friends are attending a show together and will sit in seats next to each other. In how many different orders can the three friends sit in the three seats?

A. / 6
B. / 9
C. / 18
D. / 27

Pre-Algebra Practice TestUnit 11C: Data AnalysisPage 1 of 8