7th Grade Unit 8

Sophie wants to know which sport is the favorite among students at her school. Which sample is more likely to be random?

• She surveys every fifth student who attends Friday night's soccer game.

• She surveys five students in every first period class.

Is the question biased or fair? Do you prefer soccer or baseball?

• biased

• fair

Is the question biased or fair? Do you prefer soothing classical music or annoying rap music?

• biased

• fair

Use a proportion to estimate the population. Total horses counted: 1583; Marked horses counted: 496; Total marked horses: 1213

• 647

• 1874

• 3871

• 587

What is the median? 13, 7, 11, 17, 2, 3, 7, 4

• 7

• 9.5

• 17

• 14

Find the mean. 4, 6, 6, 7, 7, 8, 9, 9

• 7

• 8

• 6

• 7.5

Find the mean absolute deviation. 4, 6, 6, 7, 7, 8, 9, 9

• 7

• 1.25

• 9

• 2.5

Which of the following do you not need to construct a box-and-whisker plot?

• median

• mean

• upper and lower quartiles (Q1, Q3)

• lowest and highest values

Use a proportion to estimate the population. Total counted: 75; Tagged counted: 10; Total Tagged: 60

• 450

• 12.5

• 8

• 45000

A ____________ can influence the results of a survey.

• biased question

• random sample