Statistics CH 3

Which measure of central tendency works for nominal variables?
-No measures work for nominal variables
-Median
-Mode
-Mean

Mode

Which measure of central tendency is most appropriate for skewed distributions?
-Median
-No measure is appropriate
-Mean
-Mode

Median

When a histogram or polygon chart for a quantitative variable has two distinct peaks, then the distribution is referred to as _____.
-unimodal
-symmetrical
-bimodal
-dichotomous

bimodal

What is the mode for the following data set?

1 2 2 2 2 2 3 3 3 3 4 4 4 5 5 5 5 6 6 7 7+
-7+
-Cannot be determined
-4
-2

2

What is the median for the following data set?

1 2 2 2 2 2 3 3 3 3 4 4 4 5 5 5 5 6 6 7 7+

-7+
-Cannot be determined
– 2
– 4

4

The three most common measures of central tendency are:
– variance, standard deviation, IQR
-mean, median, mode
– inferential, descriptive, explanatory
– nominal, ordinal, ratio

mean, median, mode

What is the minimum level of measurement needed to calculate the mode?
– nominal
– interval
– ratio
– ordinal

nominal

What is the median for these data?

5, 1, 1, 3, 2

-cannot be calculated
-1
-2
-2.4

2

Which of these measures is LEAST affected by outliers?
-median
-mean
-standard deviation
-geometric mean

median

Which measure of central tendency is LEAST efficient?
– mode
-all are the same
-mean
-median

mode

Which of the following is NOT a measure of central tendency?
-mode
– median
-mean
-standard deviation

standard deviation

What is the minimum level of measurement needed to calculate the median?
-ratio
-nominal
– interval
– ordinal

ordinal

What is the mean for these data?

3, 1, 2, 5, 3, 4

– 6
– 3.5
– cannot be calculated
– 3

3

In a negatively skewed distribution, which measure will generally have the highest value?
– all are the same
– median
– mode
– mean

mode

Which measure of central tendency is MOST influenced by outliers?
– mode
– mean
– all are the same
– median

mean

In a positively skewed distribution, which measure will generally have the highest value?
– mode
– all are the same
– median
– mean

mean

Question 2
1 / 1 pts
What is the minimum level of measurement needed to calculate the mean?
– ordinal
– nominal
– interval
– ratio

interval

Which measure of central tendency is MOST affected by outliers?
– all are the same
– mean
– mode
– median

mean

What is the mean for these data?

3, 1, 2, 5+, 2, 4

– 3
– 6
– 2.5
– cannot be calculated

cannot be calculated

What is the median for these data?

3, 1, 2, 5+, 2, 4

– cannot be calculated
– 2.5
– 3
– 6

2.5

Which of these measures of central tendency works for nominal variables?
– The mean
– Both the mean and the median work for nominal variables.
– Neither the mean nor the median works for nominal variables.
– The median

Neither the mean nor the median works for nominal variables.

When a histogram for a quantitative variable has only one distinct peak, then the distribution is referred to as…
– unimodal.
– symmetrical.
– normal.
– ideal.

unimodal

What is the mode for the following data set?

1 2 2 2 2 2 3 3 3 3 4 4 4 5 5 5 5 6 6 7 7+

– 3
– 2
– Cannot be determined
– 7+

2

For which levels of measurement can you calculate the mode?
– Interval only
– Neither ordinal nor interval
– Ordinal only
– Both ordinal and interval

Both ordinal and interval

Which of these measures is MOST affected by outliers?
– They are all affected identically
– The mode
– The mean
– The median

The mean

Which of the following measures of central tendency can be used with data on the ratio level of measurement?
– The mean or the mode
– The mode only
– The mean only
– Neither the mean nor the mode

The mean or the mode

What is the mean for these data?

4, 2, 3, 6, 4, 5

– 4.5
– Cannot be calculated
– 5
– 4

4

Which measure of central tendency is always influenced by outliers?
– The median
– The mean
– The mode
– They are all affected identically

The mean

What is the highest level of measurement?
– Ratio
– Interval
– Ordinal
– Nominal

Ratio

What is the mode for these data?

3, 1, 2, 5+, 2, 4

– 2.5
– 2
– 6
– Cannot be calculated

2