Statistics Mean Median Mode Standard Deviation

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

• 68%

• 95%

• 99.7%

• 100%

Kayla took a look at all of her English grades and saw that she received a 90 on majority of her assignments. Therefore, 90 is most like the __________ of her list of grades.

• mode

• range

• variance

• minimum value

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

Which z-score is unusual?

• -1.52

• 0.97

• 1.98

• -2.31

If a data value has a negative z-score, what can we say about that data value?

• the data value is below average

• the data value is less than zero

• the data value is unusual

• the data value is not unusual

Jade subtracted the smallest value from the largest value in the data set. What statistic was she calculating?

• standard deviation

• range

• variance

• mean

If we use the mean to measure the typical value or center of the data, we would use the _________ to measure the variability.

• IQR

• Median

• Mean

• Standard Deviation

The median is the...

• average of all data values

• the most frequently occurring number

• the difference between the biggest and smallest value

• the middle value