Statistics Outliers and Standard Deviation

How do you determine if a data value is an outlier? Check all that apply.

• 1.5IQR

• Q1 + 1.5IQR

• Q3 - 1.5IQR

• Q3 + 1.5IQR

Which of the following are true about the IQR? Check all that apply.

• IQR = Q3 - Q1

• IQR = Q1 - Q3

• The IQR is the middle 50% of a distribution

• IQR stands for interquartile range

• The IQR is the width of the box in a boxplot

The salary of the employees in the office were $15,000; $18,000; $16,000; $14,000; $90,000; and $17,000. Based on this information an outlier will be a number greater or less than? Select your answer.

• Less than 10,500; then there are no outliers to the left

• Greater than 22,500 then 90,000 is an outlier

• Greater than 10,500 then all values are outliers

• Grater than 23,000; then 90,000 is an outlier

A  number that is either MUCH larger or MUCH smaller than the rest of the numbers is a(n)

• outlier

• inlier

• lier

• I'm lying

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

• 6.89

• 10.1

• 7.26

• 9

Which of the following is a measure of variability?

• mean

• median

• IQR

• standard deviation

Identify the outlier for the given data?
23, 34, 27, 7, 30, 26, 28, 31, 34

• 7

• 23

• 31

• 34

The least salary of the employees in the office is $15,000; and the greatest salary is 70,000. Another salary of 100,000 is added to the office salary. Select a true statement for the following each statistics.

• Mean decrease

• Median cannot be determine

• Median will decrease

• Mean will increase

• Standard deviation will decrease

If a number is added to the set that is near the mean, how does this affect standard deviation?

• increase

• decrease

• stay the same

• both increase and decrease

Why would median be the best measure of center for the following set of data?
100, 125, 100, 95, 125, 800, 150

• There is an outlier.

• There is repeated data.

• All values should be included in the measure of center.

• All of the above.