NCDAP Data Analysis & Statistics 3

Question 1

A survey of 200 students found that 80 students prefer online classes. What fraction of students prefer online classes?

Accepted Answer

2/5

Answer

1/4

Answer

1/3

Answer

3/5

Question 2

A scatterplot shows a positive correlation between hours studied and test scores. This means:

Accepted Answer

As hours studied increase, test scores tend to increase

Answer

As hours studied increase, test scores tend to decrease

Answer

Hours studied and test scores are unrelated

Answer

Test scores only depend on hours studied

Question 3

The heights of five plants (in cm) are: 12, 15, 18, 15, 20. What is the mean height?

Accepted Answer

16

Answer

15

Answer

18

Answer

17

Question 4

Which graph type is BEST for showing how a quantity changes over time?

Accepted Answer

Line graph

Answer

Pie chart

Answer

Bar graph

Answer

Histogram

Question 5

Two events are independent if:

Accepted Answer

The outcome of one does not affect the outcome of the other

Answer

They cannot both happen at the same time

Answer

One event causes the other

Answer

They share the same sample space

Question 6

A frequency table shows: A=5, B=8, C=12, D=3, F=2. What is the total number of grades recorded?

Accepted Answer

30

Answer

25

Answer

28

Answer

32

Question 7

If the median of an ordered data set with 9 values is the 5th value, which position holds the median in a data set with 11 values?

Accepted Answer

6th

Answer

5th

Answer

7th

Answer

Between the 5th and 6th