AnswersTX-College Prep Math BUnit Test

Unit Test — Unit test Answers

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Tyrell recorded his science scores and his math scores. The measures of center and variation for each score are shown in the table below.Measures of Center and Variationfor Tyrell’s Science and Math Scores ScienceMathMean7880Median8080Mode6085Range4015Mean Absolute Deviation14.44.0Which inference can be made when analyzing the data in the table?

A
There is more variation in the science scores.
B
Tyrell prefers math over science.
C
The mode is the best measure of the typical score for both science and math.
D
The median for each subject is the same as the mean.
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Dylan wanted to find the average number of hours per day that the students in his class practiced their instruments. He chose three students by drawing their names from a hat. What should he do to ensure that he has an accurate average for the class?

Question illustration
A
He should add the three numbers and divide by 3 because that is how one finds an average.
B
He should poll more students to eliminate the variability caused by a sample size that is too small.
C
He should take the middle number as his average since he has three observations.
D
He should just find the average of 0.5 and 4 since 0 does not change anything when adding.
43

The box part of the box plot contains all the values between which numbers?

Question illustration
A
between 27 and 36 and between 37 and 40
B
between 32 and 36
C
between 32 and 37
D
between 27 and 32 and between 37 and 40
44

Raj polled 100 students in his class to compare the number of hours that teen boys and girls played video games each week. The results of his survey are shown below. Which gender shows greater variability in their playing time?Hours of Video Game Time per Week for Teen Boys Hours of Video Game Time per Week for Teen Girls

Question illustration
A
Boys show greater variability because the 3rd quartile for boys is 17 but only 15 for girls.
B
Boys show greater variability because the median playing time for boys is 14.5 but only 6 for girls.
C
Girls show greater variability because the interquartile range for girls is 12 for girls but only 8 for boys.
D
Girls show greater variability because the data for the girls is skewed toward the lower end of the box plot.
45

A representative from plan 1 wants to use the graph below to sell health plans for his company. How might the graph be redrawn to emphasize the difference between the cost per doctor visit for each of the three plans?

Question illustration
A
The scale on the y-axis could be changed to 0–100.
B
The scale on the y-axis could be changed to 25–40.
C
The interval of the y-axis could be changed to count by 5s.
D
The interval of the y-axis could be changed to count by 20s.

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