Chapter 9 Test - Statistics

1) The following table shows the number of pages in novels that Madison read for pleasure each month during the school year.
If Madison read only 125 pages during the month of May, which measure of data changed the most?
B. Median A. Mean D. All measures were affected equally. C. Mode 2) The graph shows the average number of hours per week that students in different grades use computers. A. The title of the graph is misleading. B. The grade intervals do not show how much time college students use computers. C. The vertical scale should show minutes used instead of hours. D. The inervals on the vertical scale are not consistent. Which statement best explains why a person reading the graph might get an incorrect idea about the differences in the number of hours computers are used by students in the grades shown? 3) The box-and-whisker plot shows the average class sizes in 15 schools. B. The largest class size is 31. C. About one-half of the classes range in size from 23 to 31. D. The median class size is 23. A. The range of the class sizes is 8. Which statement about the class sizes must be true? 4) Jade has an average of 95 on 15 quiz grades. If her teacher drops Jade’s lowest grade, a 72, which equation can be used to find quiz average?
A. A = ( 14 B. A = 14 C. A = 15 D. A = 14 From these results, Kaitlyn concluded that band was the favorite class among all the students at her school. Which is the best explanation for why her conclusion might not be valid? 5) Kaitlyn surveyed all the members of the middle school band about their favorite class this semester. The results are shown in the table.
A. The survey should have been done each day for a week. B. The sample was not representative of all the students at the school. C. The survey should have been done with eighth-grade students only. D. The band meets only 3 days a week. 6) Amber can read an average of 18 pages during a 30-minute reading period at school. At this rate, approximately how long will it take her to read a 380-page book? C. 23 hours D. 42 hours A. 11 hours B. 21 hours
7) Use the Histogram shown below to answer the question. Number of CDs Owned How many classmates own more than 300 CDs? A. 16 B. 2 D. 22 C. 6
8) Use the Histogram shown below to answer the question. Number of CDs Owned How many classmates were surveyed? A. 22 B. 19 C. 21 D. 20 9) A retail store had total sales of $436, $650, $530, $650, $500, $489, and $423 last week. Which measure of data would make the store’s sales last week appear the most profitable? D. Range B. Median C. Mode A. Mean 10) The stem-and-leaf plot shows the highest recorded February temperature measured in degrees Fahrenheit for 12 U.S. Cities.
In how many cities is the highest recorded February temperature below 43°? A. 5
B. 6 C. 7 D. 8 11) Choose an appropriate display for the set of data in the table below. C. Line Graph A. Histogram
B. Circle Graph D. Scatter Plot 12) Which of the following choices would be appropriate to display sales of the best selling type of car?
B. bar graph C. histogram D. line graph A. scatter plot
D. Twice as much was spent to prepare the food as to set up the games.
C. The rides brought in $40,000 in revenue. A. The raffle produced three times as much income as the food. B. The income from food was twice as much as the income from the games. Which of the following conclusions is supported by this graph? Which measure would make it seem as if Julia got very few phone calls each day? 14) The number of phone calls Julia received on her cell phone each day for the past week is listed in the table below.
A. Mean B. Median
C. Range D. Mode 15) Ms. Henslee made the following box-and-whisker graph of the quiz grades in her Math class.
A. 70 What is the median quiz grade for the class? B. 77 C. 96 D. 86 16) Luke’s math scores for this grading period are listed:
C D A B 17) This graph displays the weights of packages shipped from a post office on Tuesday. According to information in the graph, no 10-12 pound packages were shipped. Which statement explains why this representation may be misleading? C. The intervals are too small. B. The vertical bars are too wide. D. The scale for the number of packages goes higher than 90. A. The scale for the number of packages does not start at 0.
18) Mrs. Plachy surveyed the students in her science classes about the type and number of pets they owned. The table shows the results of the survey. Which circle graph best represents the type and number of pets reported by students in the survey? A B C D 19) Which graph shows an overall decrease in the amount of sales revenue over time? A B D C 20) A store manager collects data showing the number of times each brand of soap is purchased in his store. Which measure of data shows which brand he sells most? A. Range B. Mode C. Median D. Mean |

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