Variability
Data Distribution
Random Samples
Inferences
Vocabulary
100
Describe a 5 number summary
What is the mean, median, mode, interquartile range, MAD.
100
Ms. Smith gave a quiz last week. The results for her two classes are shown on the box and whisker plots below.
Which sentence best describes the quiz results?
A. The medians for the two classes are the same.
B. Class A has a smaller range of scores in the upper quartile than Class B.
C. Class A performed better than Class B.
D. The lower extreme of Class B is greater than the lower extreme of Class A.
What is C. Class A performed better than Class B.
100
The names of 25 employees being chosen out of a hat from a company of 250 employees would be called?
What is a random sample?
100
On a quiz show, a contestant correctly answered 9 of the last 12 questions.
Suppose the contestant continues on the show and tries to correctly answer 24 questions. About how many questions would you predict the contestant to correctly answer?
What is 18 questions?
100
Mode
What is the number that occurs the most often?
200
There are approximately 100 students enrolled in Algebra 1 in seventh grade and approximately 100 students enrolled in Algebra 1 in eighth grade. Ms. Robinson wants to compare the performance of students in the two grades using their scores on a recent test. She randomly selected 26 scores from each grade and created the line plots shown below.
Which of the following comparisons is NOT supported by the line plots?
A. On this test, the median score is the same for both grades.
B. On this test, students in seventh grade generally scored higher than students in eighth grade.
C. There is greater variability among the scores of the eighth-grade students when all scores are considered.
D. There is greater variability among the scores of the seventh-grade students when only the middle 50% of the scores are considered.
What is A. On this test, the median score is the same for both grades.
200
Which conclusion can be drawn from the data shown in the graph?
A. When the wolf population is low, the moose population is low.
B. When the wolf population is high, the moose population is high.
C. When the wolf population is increasing, the moose population is decreasing.
D. When the wolf population is decreasing, the moose population is decreasing.
What is C. When the wolf population is increasing, the moose population is decreasing.
200
Many bird species on the Pitcairn Islands are in decline. In order to estimate the population of a particular species of bird, scientists mark 60 birds by attaching very small computer chips. A few days later, they catch 700 birds, 30 of which are marked with computer chips attached to them. To the nearest whole number, what is the best estimate for the bird population?
What is 1400?
200
A survey is conducted to determine why the use of the school cafeteria is decreasing. For the best feedback, who should be surveyed?
A. every tenth student in the cafeteria line
B. fifty random students during first period
C. groups of students who do not eat in the cafeteria
D. several classes in rooms convenient to the cafeteria
What is C. groups of students who do not eat in the cafeteria
200
When you determine the average.
What is the mean?
300
Katie and Danielle recorded their resting heart rates each morning for ten days. The double dot plot shows their heart rates in beats per minute.
Which of the following statements is not true?
A. Katie has more varied resting heart rate.
B. Danielle’s heart rates peak between 70 and 72 minutes.
C. Katie’s heart rates peak at 65 minutes.
D. Katie has a greater average resting heart rate.
What is D. Katie has a greater average resting heart rate.
300
Megan asked the members of the boys’ and girls’ tennis teams at what age they first started playing tennis. She recorded the answers above.
By how much did the median of the two data sets change?
A. 1
B. 2
C. 3
D. 4
What is A. 1
300
The table shows the results of a survey in which students were asked to name their favorite season.
Predict how many students out of 350 prefer summer. Round to the nearest whole number, if necessary.
A. 46
B. 88
C. 133
D. 11
What is 133?
300
Cheryl surveyed 10 of her classmates and asked them what their favorite type of television show was. Of the 10 students surveyed, 7 indicated that drama was their favorite. Cheryl concluded that dramas are the favorite type of television show for 70% of the 2,000 students at her school. Which choice describes the flaw in Cheryl’s study?
A. She asked only students at her school.
B. She asked only about television shows.
C. She asked only television watchers.
D. She asked only 10 people.
What is D. She asked only 10 people.
300
The middle number of a data set.
What is the median.
400
Tim wanted to see whether his 7th grade science book or his 7th grade social studies book had longer sentences. He randomly chose 40 sentences from each textbook and recorded the number of words in each sentence. His results are shown in the table.
Which inference is correct based on the results?
A. The entire science book has no more than 18 words per sentence.
B. The entire social studies book has a range from 2 to 19 words per sentence.
C. In general, the science book has longer sentences than the social studies book.
D. In general, the social studies book has longer sentences than the science book.
What is D. In general, the social studies book has longer sentences than the science book.
400
4.
The box-and-whisker plots show the test scores of the first test of the grading period and the last test of the grading period. The same number of students were tested on each test.
Which statement is true about the test scores?
A. Only one person got a 100.
B. The range is lower for the first test.
C. The median is greater for the last test.
D. The same number of students scored 90 or above on both tests.
What is C. The median is greater for the last test.
400
Mei asked local shoppers who were buying grapefruit juice if they preferred pink or white grapefruit juice. Of 993 shoppers, 672 preferred white grapefruit juice and 321 preferred pink grapefruit juice. What can Mei conclude?
A. White grapefruit juice is better than pink grapefruit juice.
B. All shoppers prefer white grapefruit juice over other drinks.
C. Local grapefruit juice buyers prefer white grapefruit juice over pink grapefruit juice.
D. Local grapefruit juice buyers prefer pink grapefruit juice over white grapefruit juice.
What is C. Local grapefruit juice buyers prefer white grapefruit juice over pink grapefruit juice.
400
Amanda asked a random sample of 40 students from her school to identify their birth month. There are 300 students in her school. Amanda’s data is shown in the above table.
Which of these statements is best supported by the data?
A. Exactly 25% of the students in Amanda’s school have April as their birth month.
B. There are no students in Amanda’s school that have a February birth month.
C. There are probably more students at Amanda’s school with an April birth month than a July birth month.
D. There are probably more students at Amanda’s school with a July birth month than a June birth month.
What is C. There are probably more students at Amanda’s school with an April birth month than a July birth month
400
What does IQR mean?
What is interquartile range
500
The graph shows the gas prices in two towns, A and B. Which statement is true?
A. The mode for town A is $3.81.
B. The mode for town B is $3.82.
C. The median for town A is $3.79.
D. The median for town B is $3.81.
What is D. The median for town B is $3.81.
500
The box-and-whisker plots show the test scores of the first test of the grading period and the last test of the grading period. The same number of students were tested on each test.
Which statement is true about the test scores?
A. The range of the first test was smaller than the range on the last test.
B. The mean of the first test was lower than the mean of the last test.
C. The extreme values of the first test were lower than the extreme values of the last test.
D. The third quartile of the first test was lower than the third quartile of the last test.
What is C. The extreme values of the first test were lower than the extreme values of the last test.
500
Jayla collected blue pens in a bag. She drew two of the five pens out of the bag. What type sample of the blue pens in the bag is represented? Explain your answer.
What is a Random Sample because every blue pen in the bag has an equal chance to be picked.
500
Jodie wants to conduct a survey to find the most popular school lunch among students in her school. Which is the best sample?
A. a random group of students eating lunch together
B. all the teachers at lunch
C. the first twenty-five students that enter the cafeteria
D.every other student who walks into the cafeteria for every period
What is D. every other student who walks into the cafeteria for every period
500
The average absolute deviation about any certain point of a data set
What is the MAD