Question

The following data shows the number of contacts that a sample of high school students had in their cell phones. 154,109,137,115,152,140,154,178,80,103,126,126,137,165,165,129,200,148A.) Identify any outliers in the dataB.) Draw a box plot to represent the dataC.) Analyze your data

Answer 1

Given set :

154,109,137,115,152,140,154,178,80,103,126,126,137,165,165,129,200,148.

Rewrite the given data set from least to highest values.



80, 103, 109, 115, 126, 126, 129, 137, 137, 140, 148, 152, 154, 154, 165, 165, 178, 200.

Recall that a data point is an outlier if it is over 1.5 times the IQR below the first quartile or 1.5 times the IQR above the third quartile.

We know that

`\text{IQR}=Q_3-Q_1`
`Q_3=The\text{ third quartile = The median of the upper half of the data set.}`

`Q_1=The\text{ first quartile = The median of the lower half of the data set.}`

The upper half of the data set is

{137, 140, 148, 152, 154, 154, 165, 165, 178, 200}

The number of data in the set is even.

There are two middle terms in this upper half of the given set. That are 154 and 154.

`Q_3=(154+154)/(2)=154`

The lower half of the data set is

{80, 103, 109, 115, 126, 126, 129, 137, 137, 140}

The number of data in the set is even.

There are two middle terms in this lower half of the given set. Which are 126 and 126.

`Q_1=(126+126)/(2)=126`

Substitute known values in the IQR formula.

`\text{IQR}=154-126=28`

We get IQR=28.

`\text{HIgher outlier }\ge Q_3+(1.5* IQR)`