(25)What is the mean of scores in the Table 5 frequency distribution?

Table 5:

X f

5 2

4 1

3 0

2 3

Group of answer choices

20/4 = 5.0

20/6= 3.33

14/4 = 3.5

12/5 = 2.4

None of the above.

Question 3

If the average number of sleep hours reported by a sample of Texas State students is M = 6.5 hrs. per night then the mean of 6.5 hours of sleep is an example of a _________.

Group of answer choices

population parameter

population statistic

sample statistic

sample parameter

Question 4 pts

A researcher wanted to know if paper color on which a test is printed affects the test performance. A sample of n = 90 students was randomly divided into two equal groups and each group received the same test but printed on a different color paper (i.e., white or purple). The mean test performance of two groups was compared to answer the research question if paper color affects test performance. In this experiment, what was the dependent variable?

Group of answer choices

the test performance.

the white color of test paper.

the purple color of test paper.

the color of the test paper - white or purple.

None of the above.

question 5

In the experiment described in the previous question about the effect of paper color on test performance, what is the independent variable?

Group of answer choices

the test performance.

the white color of test paper.

the purple color of test paper.

the color of test paper, white or purple.

None of the above.

question 9

Which of the following is NOT a continuous variable?

Group of answer choices

Reaction time to detect a target in the visual attention task.

Person's height.

Number of text messages received per day.

All of the above are examples of continuous variable.

A & B

None of the above.

(15). A researcher recorded gender of all participants of his study using the following coding system: Females = 1, Males = 2 and Other = 3. What type of graph should he use to show the frequency distribution of gender in his study?

Group of answer choices

A histogram.

A frequency polygon

Either a histogram or a frequency polygon.

A bar graph.

Either a histogram or a bar graph.

20. For the frequency distribution in the Table 4, what is the width of each interval?

Table 4:

X f

10 - 14 6

5 - 9 8

0 - 4 4

Group of answer choices

4

5

6

10

22.

If a professor announces that the last exam scores are positively skewed, what can you conclude about the students' scores on this exam?

Group of answer choices

Most of the students had relatively high scores.

Most of the students had relatively low scores.

About 50% of the students had high scores and the rest had low scores.

It is not possible to draw any conclusions about students' exam scores based on this information.

Question 26

What is the median of scores shown in the Table 6 frequency distribution?

Table 6:

X f

5 2

4 1

3 1

2 3

Group of answer choices

2.0

3.0

4.0

4.5