NJGPA Statistics, Data Analysis, and Probability

Question 1

A data set has the values: 4, 7, 7, 9, 13. What is the mean of this data set?

Accepted Answer

8

Answer

7

Answer

9

Answer

10

Question 2

A bag contains 3 red marbles, 5 blue marbles, and 2 green marbles. If one marble is drawn at random, what is the probability it is blue?

Accepted Answer

1/2

Answer

1/5

Answer

3/10

Answer

2/5

Question 3

Which measure of central tendency is most affected by an extreme outlier in a data set?

Accepted Answer

Mean

Answer

Mode

Answer

Median

Answer

Range

Question 4

A scatter plot shows a trend where as x increases, y also increases consistently. What type of correlation does this represent?

Accepted Answer

Positive correlation

Answer

Negative correlation

Answer

No correlation

Answer

Inverse correlation

Question 5

The following scores were recorded: 65, 70, 70, 75, 80, 85, 95. What is the median?

Accepted Answer

75

Answer

70

Answer

74

Answer

80

Question 6

A student surveys 30 classmates about their favorite subject and displays the data in a bar graph. What type of data did the student collect?

Accepted Answer

Qualitative categorical data

Answer

Quantitative continuous data

Answer

Quantitative discrete data

Answer

Numerical interval data

Question 7

A box plot shows a minimum of 20, Q1 of 35, median of 50, Q3 of 65, and a maximum of 80. What is the interquartile range (IQR)?

Accepted Answer

30

Answer

60

Answer

15

Answer

50