Finding an Outlier

Given the 5 number summary, the maximum is an outlier.

• True

• False

Given the 5 number summary, the minimum is an outlier.

• True

• False

A value that is much higher or much lower than the other values in a set of data.

• Outlier

• Box Plot

• Range

• Histogram

Extremely high or low values in a data set are called __________ .

• outliers

• median

• mode

• first quartile

Which data point did the statistician exclude?

• (2.3, 11.0)

• (4.2, 16.5)

• (6.4, 23.1)

• (8.2, 24.3)

When using IQR to find outliers, which formula will identify the upper limit?

• 1.5(IQR)

• Q1 + 1.5(IQR)

• Q1 - 1.5(IQR)

• Q3 + 1.5(IQR)

When using IQR to find outliers, which formula will identify the lower limit?

• 1.5(IQR)

• Q1 + 1.5(IQR)

• Q1 - 1.5(IQR)

• Q3 + 1.5(IQR)

A teacher has recorded the scores of a recent test. 10 62 75 88 90 92 95 98 98 100 How does excluding the outlier affect the mean of these test scores?

• Excluding the outlier increases the mean.

• Excluding the outlier decreases the mean

What measure of center is best to use when we have outliers?

• mean

• median

• mode

• range

Data Set: 44, 43, 42, 40, 42, 45, 39, 38, 18.

Is the median or mean the best measure of center? Explain.

Choose the correct measure of center AND explanation.

• Median, because there is an outlier

• Median, because the data is clustered together

• Mean, because there is an outlier

• Mean, because the data is clustered together