Quiz: Univariate Data Analysis

A school newspaper will survey students about the quality of the school’s lunch program. Which method will create the least biased results?

• Twenty-five vegetarians are randomly surveyed.

• Twenty-five students are randomly chosen from each grade level.

• Students who dislike the school’s lunch program are chosen to complete the survey

• A booth is set up in the cafeteria for the students to voluntarily complete the survey.

Mr Holland gives his class a test. The results are:

34%, 44%, 75%, 21%, 98%, 86%, 71%, 76%, 63%, 55%

How many students scored above the mean percentage?

• 4

• 5

• 6

• 7

D&D players were rolling a 10-sided die thirty-five times. What was the median roll?

• 5

• 6

• 5.5

• 5.7

Whose scores have greater variability?

• Noah's scores

• Jada's scores

• cannot be determined

• The variability is the same

Find the median, first quartile, third quartile, and interquartile range of the data.

32, 53, 72, 66, 47, 54, 49, 67, 71

• Median: 54

  First Quartile: 49

  Third Quartile: 67

  IQR: 18

• Median: 54

  First Quartile: 48

  Third Quartile: 69

  IQR: 21

• Median: 54

  First Quartile: 48

  Third Quartile: 69

  IQR: 22

• Median: 54

  First Quartile: 49

  Third Quartile: 69

  IQR: 20

If you remove the outlier, what will happen to the mean?

5, 7, 7, 8, 8, 9, 9, 9, 35

• It will get smaller because the outlier is small

• It will get bigger because the outlier is small

• It will get smaller because the outlier is big

• It will get bigger because the outlier is big

What will happen to the median if you remove the outlier?

5,5,7,7,7,8,8,8,8,9,9,9,35

• It will increase

• It will decrease

• It will stay the same

• It will disappear

Owen was asked to write down the number of pull-ups that 7 of his classmates could do. He wrote down: 3, 2, high, low, 6, 1, 8. Owen said that "high" was greater than 6 and "low" was less than 2. Find the median.

• 2

• 3

• 2.5

• Cannot be determined.

On a recent test, one class of 26 students had a mean score of 78%, while another class of 32 students had a mean score of 86%. What is the overall mean of the two classes combined?

• 82

• 82.4

• 81

• 83

Find x if 5, 9, 11, 12, 13, 14, 17 and x have a mean of 12.

• 15
• 16
• 17
• 18