Outlier, Standard Deviation, Iqr, Mad

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

Pick the definition of an outlier.

• A value that lies outside of most other values in a data set.

• A value that is the largest.

• A value that is the smallest.

• A value that occurs the most.

Interquartile Range or IQR is a measure of variability and helps determine the spread of the data.

• True

• False

In a population of five university students with GPAs of 2.5, 2.3, 1.7, 1.4, and 1.1, a sample of three students are considered. What would be the standard deviation of the resulting sampling distribution?

• 0.53

• 0.41

• 0.35

• 0.22

According to the 1.5 x IQR rule, how many outliers are there in the data set 72, 110, 114, 115, 118, 123, 144, 156?

• None

• One

• Two

• Three

Which restaurant has a greater IQR?

• Lucy's Steakhouse

• Gary's Grill

• They are the same

Identify the outlier for the given data, using the formula.

23, 34, 27, 7, 30, 26, 28, 31, 34

• 7

• 23

• 31

• 34

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

• Mode

• MAD

• Standard Deviation

• IQR or Interquartile Range

The two measures of center we've study this unit are...

• Interquartile Range

• Mean Absolute Deviation

• Mean

• Median

• Standard Deviation

The mean life of a tire is 30,000 km. The standard deviation is 2000 km.

Then, 68% of all tires will have a life between ___________ km and __________ km.

•  28,000 km and 32,000 km.

• 24,000 km and 34,000 km.

• 26,000 km and 34,000 km.

• 27,000 km and 31,000 km.