Review Part 1

What is the mean, median, and mode of the data set 20, 20, 30, 40, 40, 40, 50, 50, 60, 70, 70, 80, 90, 90?

• Mean: 55, Median: 40, Mode: 53

• Mean: 53.6, Median: 53, Mode: 40

• Mean: 55, Median: 40, Mode: 50

• Mean: 53.6, Median: 50, Mode: 40

What is the variance and standard deviation of the data set 7, 10, 14, 19, 22, 23, 26, 28, 30, 35?

• Variance: 21.4, Standard deviation: 8.51

• Variance: 72.44, Standard deviation: 21.4

• Variance: 8.51, Standard deviation: 72.44

• Variance: 72.44, Standard deviation: 8.51

What are the values 2 standard deviations above and below the mean for the data set 7, 10, 14, 19, 22, 23, 26, 28, 30, 35?

• 4.38 and 38.42

• 12.89 and 29.91

• 17.15 and 25.65

• 20.4 and 22.4

Every 5th person entering a mall is asked why they are shopping there. What type of sample is this?

• Convenience sample

• Random sample

• Self-selected sample

• Systematic sample

A kindergarten teacher wants to determine whether his students prefer colored pencils or crayons. What is the best way for him to conduct an experiment?

• The teacher gives the students questionnaires asking questions about their coloring preferences

• The teacher monitors the students’ preferences during coloring time.

• The teacher gives colored pencils to half of his students and crayons to the other half, then records the amount of time they each spend coloring.

• The teacher only provides colored pencils during coloring time and records the number of times his students ask for crayons.

Your school wants to determine what sports should be played in physical education classes. What sample would be least biased?

• 30 students from one of the classes

• 30 students selected at random

• 30 students who volunteer to make suggestions

• 30 students who spend the most time in the gym