Statistics

What is the median of 3, 3, 3, 4, 5, 6, 7, 8, 8, 9?

• 5.6

• 5

• 5.5

• 3

Which of the following is a measure of central tendency?

• correlation coefficient

• mode

• IQR

• standard deviation

What does variance measure?

• the difference between lowest and highest score of a distribution

• the standard deviation

• how far a set of numbers are spread out from their mean

• how far the mean, median, mode vary from each other

Which of the following describes an extreme score in a group of scores?

• outlier

• extremist

• discrepant

• champion

Given a normal distribution, what percentage of scores fall within one standard deviation of the mean?

• 95%

• 50%

• 99.7%

• 68%

Where in a distribution is the lower quartile?

• at the median of the scores on the left of the overall median

• at the median

• at the mean

• at the median of the scores on the right of the overall median

The mean of a distribution of ten scores is exactly 7. There are two 7's. You remove them. The mean is now

• less than 7

• more than 7

• 7

• insufficient information

If the standard deviation of a distribution is zero, which of the following is true?

• all the scores are the same

• the distribution is symmetrical

• the distribution is positively skewed

• i don't know