Algebra Data Analysis Pt 1 Review

Garth is packing boxes with books. The list shows how many books are in each of 10 boxes.

6, 14, 6, 18, 9, 9, 12, 10, 11, 15

Which statement is true about the number of books packed to a box?

• The median number of books to a box is 8.

• The median number of books to a box is 9.

• The mean number of books to a box is 11.

• The mean number of books to a box is 12.

The table shows the results of a survey of 400 random people on whether they like liquid soap, bar soap, or both.

Which is the marginal relative frequency for the people who do not like bar soap?

• 100/400

• 120/400

• 280/400

• 300/400

If a new data point at 12 is added to the graph, which will be true?

• The mean will increase, and the median will stay the same.

• The median will increase, and the mean will stay the same.

• The mean will increase more than the median, but both will increase.

• The median will increase more than the mean, but both will increase.

The mean score on a physics test was 75 points. Amy’s score was 67 points, which was 2 standard deviations below the mean.

What is the variance of the data set?

• 2

• 4

• 8

• 16

The president of the math club is conducting a survey to see where the twelfth-grade class wants to go on their field trip. Instead of asking the whole class, she surveys only the twelfth-grade members of the math club. She records their choices and plans to present the results to the school principal. What type of sampling did she use?

• systematic random sampling

• simple random sampling

• stratified sampling

• convenience sampling

Which statement about the data is true?

• The data has a standard deviation of 0.1.

• The mean of the data is greater than 0.5.

• A value of 0.7 is within 1 standard deviation of the mean.

• A value of 0.9 is more than 2 standard deviations from the mean.

The conditional relative frequency table was generated using data that compares the favorite subjects of male and female students at a high school. The survey was given to 120 male students and 180 female students.

How many students in the survey said that math was their favorite subject?

• 42

• 81

• 120

• 123

A researcher wants to survey people from different age groups to analyze voting patterns. Which type of survey will best accomplish this goal?

• systematic random sampling

• voluntary sampling

• convenience sampling

• stratified sampling

A utility company hires pollsters to knock on random doors in different parts of town to survey residents about the cost of their electric bill. Would this study be biased? Why or why not?

• No, it is not biased. All residents of the town will have the opportunity to respond.

• Yes, it is biased. Some of the residents who are surveyed may not want to respond to someone who knocks at their door.

• No, it is not biased. All residents who are surveyed will want to respond.

• Yes, it is biased. Only certain parts of the town were surveyed.

The data set represents the number of snails that each person counted on a walk after a rainstorm.

12, 13, 22, 16, 6, 10, 13, 14, 12

What is the outlier of the data?

• 6

• 11

• 15

• 22