Unit 7– Data Collection and Analysis Standard(s): 7.SP.1

Questions 1. Tom polled thirty students in his vegetarian club about what type of lunches the students of the school would like. Is this sample biased? Why or why not? 2. The yearbook staff is trying to pick a theme for this year’s school yearbook. Which method of surveying would not provide a valid sample of the student population? A. Every fourth student to enter the school. B. Randomly selecting 20 responses from a school wide online questionnaire. C. Choosing six students from each 7th grade science class. D. Randomly selecting students from the school cafeteria. 3. A store in the mall wants to know what style of pants to purchase for the men’s department. Which group would give the most valid results? A. The volunteers at a blood drive. B. Every 5th person to enter a Grocery store that afternoon. C. 150 men entering the mall on Saturday. D. The boys on the middle school baseball team. 4. Which sample would be the most representative of a school population of 2,000 students? A. The first twenty students who walk out of school on Monday. B. Twenty-five students randomly chosen as they enter the cafeteria. C. The fifty students in the chess club. D. 150 students randomly chosen from a school assembly. 5. The PTA is trying to plan a 6th grade field trip. Which group should they survey to collect the best sample? A. The basketball team. B. Every 10th person to enter the cafeteria. C. All students in a 7th grade math class. D. Every fifth 6th grade student who enters the school.

2016

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Unit 7– Data Collection and Analysis Standard(s): 7.SP.2 Questions 1. Wildlife Rescuers marked 100 bears and released them into the wild. If a few months later, they caught 35 bears with 10 markings, what is the best estimate for the entire population of the bears? 2. Students at Top Middle were surveyed about their favorite pizza topping. Based on the table below, what is true? Topping Pepperoni Mushrooms Peppers Onions Number 55 99 102 108 A. Less than ½ of the students prefer peppers or mushrooms B. About ½ of the students prefer pepperoni or peppers C. About 50% of the students prefer peppers D. About 65% of the students prefer pepperoni 3. Two random samples of 50 students were surveyed about their favorite color crayon. Which statement is true about the results in the table? Sample 1 Sample 2 Red 11 12 Pink 13 13 Blue 11 14 Green 15 11 Total 50 50 A. B. C. D.

More students prefer blue to pink More students like blue than green 25% of the students like blue A total of 13 students prefer pink

4. The age of 6 boys in a skating class are: 9, 17, 14, 10, 15, 13. What is a reasonable prediction of the mean age of boys in the class? 5. Julie is collecting information about turtles in her neighborhood pond. She marks 60 turtles and puts them back in the pond. Weeks later, if she catches 17 turtles, 3 of which are marked, what is a good estimate for the total number of turtles in the pond?

2016

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Unit 7– Data Collection and Analysis

Standard(s): 7.SP.3 Questions 1. Find the difference in the median number of points scored by each team. Jaguars Tigers

27, 18, 26, 32, 21 19, 35, 41, 24, 17

2. Find the difference in the mean number of points scored by each team. Jaguars Tigers

27, 18, 26, 32, 21 19, 35, 41, 24, 17

3. Find the difference in the interquartile range of each team. Jaguars Tigers

27, 18, 26, 32, 21 19, 35, 41, 24, 17

4. Find the difference in the range of points scored by each team. Jaguars Tigers

27, 18, 26, 32, 21 19, 35, 41, 24, 17

5. What comparison statement about the Mean Absolute Deviations (MAD) is true about the student’s scores?

Julie Rick Dave A. B. C. D.

Grades 99, 100, 99, 88 80, 88, 92, 80 73, 80, 82, 73

Julie’s MAD = Rick’s MAD Dave’s MAD < Julie’s MAD Rick’s MAD = Dave’s MAD Dave’s MAD > Rick’s MAD

2016

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Unit 7– Data Collection and Analysis Standard(s): 7.SP.4

Questions

Answers

1. Belinda’s first four test scores are shown below. What does Belinda need to earn on her fifth test to have an average of 90? 86, 99, 75, 97 2. Using the income numbers below, which measure of central tendency, would best represent the income that most people have? 50,000 63,000

62,000 71,000

51,000 57,000

140,000 45,000

3. Rashia’s first 6 scores from the competition are shown below. What does Rashia need to earn on her seventh competition to have an average of 87? 92, 56, 89, 100, 78, 95 4. If Crystal scored an 81, 90, and 95 on her science exams, what score would she need on her next exam in order for her mean and median scores to be the same? A. 80 B. 78 C. 86 D. 99 5. The heights of boys and girls who entered kindergarten was recorded and analyzed. The results are below.

Lowest Value Lower Quartile Median Third Quartile Highest Value

Boys 40 46 50 62 65

Girls 35 42 47 50 62

Based on the information above, which statement is true? A. 50% of the girls were between 42 and 62 inches tall. B. The median boy height was 52 inches. C. 25% of the boys heights were between 62 inches and 65 inches. D. The lower quartile for boys was 40 inches.

2016