Calculating Standard Deviation

If the standard deviation of a data set is 4, what is the variance?

• 2

• 16

• 4

What is the variance for the data given:
5, 10, 7, 12, 0, 20, 15, 22, 8, 2

• 47.47

• 102.01

• 52.77

• 81

Adam's Z-score on a test is +2.50. What does this mean?

• Adam's score has a 2.5% chance of being better than any other randomly selected score.

• Adam's test score was better than 25% of his peers.

• He scored 2.5 standard deviations above the average.

• He did terrible.

According to the picture, what is the standard deviation of the data set?

• 6.3

• 44

• 3.6

• 3.3

Which statistics measures how spread out the data values are in a data set?

• mean

• mode

• maximum value

• standard deviation

The ____________ is equal to the standard deviation squared.

• standard deviation

• range

• variance

• maximum value

The following symbol represents what?

• the sample mean

• the population mean

• the sample standard deviation

• the population standard deviation

• the sample size

The following symbol represents what?

• the sample mean

• the population mean

• the sample standard deviation

• the population standard deviation

• the sample size

According to the Empirical Rule, what percentage of data values lie within TWO standard deviation of the mean?

• 68%

• 95%

• 99.7%

• 100%

According to the Empirical Rule, what percentage of data values lie within THREE standard deviation of the mean?

• 68%

• 95%

• 99.7%

• 100%