NJGPA Statistics, Data Analysis, and Probability 2

Question 1

A spinner has 8 equal sections numbered 1 through 8. What is the probability of spinning an even number?

Accepted Answer

1/2

Answer

1/4

Answer

3/8

Answer

5/8

Question 2

A frequency table shows that 12 students scored in the 80–89 range out of 40 total students. What percentage of students scored in this range?

Accepted Answer

30%

Answer

12%

Answer

25%

Answer

33%

Question 3

Two events are independent if the outcome of one does not affect the outcome of the other. A fair coin is flipped twice. What is the probability of getting heads both times?

Accepted Answer

1/4

Answer

1/2

Answer

3/4

Answer

1/3

Question 4

Which graphical display is best for showing how a single data set is distributed, including the median and quartiles?

Accepted Answer

Box plot

Answer

Pie chart

Answer

Line graph

Answer

Histogram

Question 5

A data set of test scores has a mean of 78 and a standard deviation of 5. Which score is closest to 2 standard deviations above the mean?

Accepted Answer

88

Answer

83

Answer

85

Answer

90

Question 6

A survey asks 200 people whether they prefer coffee or tea. 130 prefer coffee. What is the relative frequency of people who prefer tea?

Accepted Answer

0.35

Answer

0.45

Answer

0.65

Answer

0.70

Question 7

A line of best fit on a scatter plot has the equation y = 2x + 3. What does the slope of 2 represent in context?

Accepted Answer

For every 1-unit increase in x, y increases by 2

Answer

The starting value of y when x equals zero

Answer

For every 1-unit increase in x, y decreases by 2

Answer

The value of x when y equals zero