Ch 4: Central Tendency

Median for the scores 0, 0, 1, 1, 1, 2, 3, 3, 3, 3 is ______.

1.5

Mode of the scores 1, 2, 2, 3, 3, 3, is ______.

3.0

Consider the set of scores, 3, 5, 6, 7, 10 in the distribution. An additional score of ______ in this set would NOT affect the median.

6

Consider the set of scores, 3, 5, 5, 6, 7,10 in the distribution. An additional score of ______ in this set would NOT affect the mode.

8

central limit theorem

The theory that, as sample size increases, the distribution of sample means of size n, randomly selected, approaches a normal distribution.

What is a true statement of the set of scores, 17, 19, 21, 50?

There is no mode.

central tendency

a measure that represents the typical response or the behavior of a group as a whole

how do you find the median when you have an equal number of scores?

add the two middle score and divide them by two

outlier

an extreme deviation from the mean

standard deviation

average distance of every score from the mean; will tell you the mean you must go to capture 68.26 of the values in the data set

Three main types of descriptive statistics are ______, ______, and ______.

central tendency; variability; visual representation

range

difference between highest and lowest scores

For some negatively skewed distribution, the mean and median can be _____.

equal

cumulative frequency

frequency at or below a score

The median ______.

is not affected by the extreme scores in the distribution

mean

located at the mathematical center of a distribution

The ______ is most influenced by extreme scores in the distribution.

mean

When you have a skewed distribution, it is better to use ______ than ______.

median; mean

The ______ and ______ are good measures of central tendency for ordinal data.

median; mode

Adding a score that is equal to the mean of the distribution could change the ______.

mode

Which is the best measure of central tendency if you are interested in a gender breakdown of managerial position at a certain company?

mode

mode

most frequently occurring score; used with nominal scores; top of the peak

The mean salary of employees of a company is US$45,316, and the median salary is US$58,450. The distribution of salary at this company is ______.

negatively skewed

unimodal

one mode

percentile

percentage at or below a score

relative frequency

possibility of a score occurring

When you have a positive skew, the mean CANNOT be ______ the median.

smaller than

variance

squared average distances of all your scores back to the mean

standard error of the mean

standard deviation for the sample mean

perfectly normal distribution

standard deviation will be closer to the mean; mean, median, and mode will be exactly the same

The mean and median are equal when you have a(n) ______.

symmetrical distribution

If everyone in your sample picked the same answer for a question, ______.

the mean, median and mean are equal

median

the middle score in a distribution; half the scores are above it and half are below it; used with ordinal scores or highly-skewed interval or ratio scores

If you have a distribution where every score occur only once, then ______.

there is no mode

bimodal

two modes

small standard deviation

values are gathered close to the mean

large standard deviation

values are more spread out

Which of the following data would be most appropriate to report mean?

weight of adult men

If you have an interval data, what circumstance is mean an appropriate measure of central tendency?

when the distribution is symmetrical