AnswersStatistical ReasoningMeasures of Variability

Measures of Variability — Quiz Answers

10 verified answers2 views
4

A box of LED light bulbs was tested to see how long the light bulbs last. The standard deviation of the light bulb lifetime data was five years. Which of the following is the best interpretation of this value?

A
The middle half of the light bulb lifetime data has a range that is five years wide.
B
The lifetime of the light bulbs typically varies by about five years from the mean.
C
The difference between the longest and shortest light bulb lifetime was five years.
D
Fifty percent of the light bulb lifetime data is below five years.
7

In a recent survey, students were asked how long they play video games in one sitting. The interquartile range of the length of play times was 43 minutes. Which of the following is the best interpretation of this value?

A
The middle half of the video game data has a range that is 43 minutes wide.
B
The number of minutes played by students typically varies by about 43 minutes from the mean.
C
The difference between the smallest and largest values in the video game data was 43 minutes.
D
Fifty percent of the video game data is below 43 minutes.
8

A tutor kept track of how many students she had helped every week for a year. The range of the number of tutored students was 10 students. Which of the following is the best interpretation of this value?

A
The difference between the smallest and largest values in the tutored students’ data was 10 students.
B
The middle half of the tutored students’ data has a range that is 10 students wide.
C
The number of students helped within a week typically varies by about 10 students from the mean.
D
Fifty percent of the tutored students’ data is below 10 students.

Did you find these answers helpful?

Measures of Variability — Quiz Answers…