Statistics for the Behavioral Sciences - Chapter 3 Central Tendency Practice Quiz

A person's phone bills for the last three months were $20, $75, and $55, respectively. What was the mean average amount for the three phone bills?

$50

What is the median for the following set of scores? Scores: 1, 5, 11, 12, 20

11

What is the value of the median for the following set of scores? Scores: 1, 4, 6, 7, 9, 15, 15, 16, 25, 30

12?

What is the mode for the following sample of n = 11 scores? Scores: 1, 2, 2, 2, 3, 3, 4, 5, 6, 6, 7

2

What is the mode for the population of scores presented in the frequency distribution table below? X f 5 1 4 4 3 3 2 4 1 2

2 and 4

A sample of n = 10 scores has a mean of M = 3. What is ΣX for this sample?

30

What is the median for the population of scores presented in the frequency distribution table below? X f 5 2 4 3 3 2 2 1 1 1

4

What is the mode for the population of scores shown in the frequency distribution table? X f 5 3 4 4 3 3 2 3 1 2

4

What is the median for the population of scores presented in the frequency distribution table below? X f 5 7 4 2 3 1 2 1 1 3

4.5

What is the mean average for the following set of quiz scores? Scores: 4, 5, 9, 2, 3, 7

5

What is the mean for the following sample of scores? Scores: 2, 4, 5, 9

5

Which statement below must be false regarding a distribution of scores?

75% of the scores are above the median

Which statement below is consistent with computing a weighted average of two individual samples?

A computed weighted average will always be closer to the mean average of the larger sample than the mean average of the smaller sample.

The mean is the..

Average score

Which statement below is true?

It is possible for a distribution of scores to have two modes.

What is the mean from the list of scores below: 2 2 2

M = 2

Consider the two frequency distribution tables below that each pertain to distinct samples. What is the weighted average of these samples when combined? Sample AX f 6 2 5 0 4 1 3 2 2 4 1 1 Sample BX f 5 2 4 5 3 1 2 0 1 5

M = 3

What is the mean from the list of scores below: 5 5 5

M = 5

A researcher assesses eye color for a sample of n = 50 people. Which measure of central tendency would be appropriate to summarize the measurements of eye color collected for this sample?

Mode

A distribution of scores is positively skewed. Which is the most probable order, from smallest to largest, for the three measures of central tendency?

Mode, median, mean

A population with a mean of µ = 9 has ΣX = 54. How many scores are in the population? Hint: 54/9 =?

N = 6

Which of the following statements must be false regarding a distribution of scores?

No individual has a score exactly equal to the mode.

Which of the following statements is true regarding the mode as a measure of central tendency?

The mode value is often useful to report as supplementary information in conjunction with the mean or median value.

Which of the following actions will always change the value of the mean?

changing the value of one score

A line graph can be used to graphically represent mean or median values for a data set when the values of a variable are measured using either a(n) _____ scale of measurement.

interval or ratio

For a perfectly symmetrical distribution, which relationship is always true?

mean = median

The mode is the only measure of central tendency that is appropriate to utilize for a variable measured with which scale of measurement?

nominal

Which of the following phrases is not consistent with central tendency as a statistical measure?

spread of scores

An introductory to psychology professor has students report their major on the first day of classes. Then, the professor decides to determine the major that is most representative of the students in their class. Which measure of central tendency should they utilize?

the mode

The mode is similar to the median as a measure of central tendency in that _____.

there are no symbols used to differentiate between whether its value(s) pertains to populations or samples.

What is the mean for the population of scores presented in the frequency distribution table below? X f 8 3 7 3 6 0 5 2 4 1 3 2 2 2 1 3

µ = 4.50