NJGPA Statistics, Data Analysis, and Probability 3

Question 1

Which sampling method involves randomly selecting participants from a complete list of the entire population?

Accepted Answer

Simple random sampling

Answer

Convenience sampling

Answer

Stratified sampling

Answer

Cluster sampling

Question 2

A data set contains the values 2, 5, 5, 6, 7, 8, 50. Which measure of central tendency would be most misleading when summarizing this data?

Accepted Answer

Mean

Answer

Median

Answer

Mode

Answer

Range

Question 3

A two-way frequency table shows data on gender and preference for a school mascot. There are 80 students total. If 40 are boys and 25 boys prefer the eagle mascot, what fraction of boys prefer the eagle?

Accepted Answer

5/8

Answer

25/80

Answer

5/16

Answer

1/2

Question 4

A histogram displays test scores in intervals of 10. The bar for 70–79 has a frequency of 15, and the bar for 80–89 has a frequency of 20. What is the total number of students who scored between 70 and 89?

Accepted Answer

35

Answer

15

Answer

20

Answer

30

Question 5

A student rolls a standard 6-sided die. What is the probability of rolling a number greater than 4?

Accepted Answer

1/3

Answer

1/6

Answer

1/2

Answer

2/3

Question 6

Which statement best describes a data set with a large standard deviation?

Accepted Answer

The data values are widely spread out from the mean

Answer

The data values are clustered closely around the mean

Answer

The median and mean are equal

Answer

The data has no outliers

Question 7

A store tracks daily sales for a week: $200, $250, $300, $250, $400, $350, $250. What is the mode of the sales data?

Accepted Answer

$250

Answer

$300

Answer

$200

Answer

$350