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# Descriptive Statistics using STATDISK

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Utilize statdisk at www.aw.com/triola in assisting with solutions.

1. Use the 40 pulse rates of women from the data set Fhealth and enter the results

Center Mean:____________Median:___________

Variation St. Dev__________Range____________

5 Number Summary Min______Q1_____Q2______Q3____Max____

Outliers______________

2. Use the 40 pulse rates of men from the data set Mhealth and enter the results.

Center Mean:____________Median:___________

Variation St. Dev__________Range____________

5 Number Summary Min______Q1_____Q2______Q3____Max____

Outliers______________

Compare the pulse rates of women and men:_________________

4. Boxplots Use the pulse rates of women and men and pint their two boxplots together in the same display. Do the boxplots suggest any notable differences in the two sets of sample data?

5. Use the BMI measurements of 40 females. Change the first BMI value from 19.6 to the outlier of 196, then provide the results.

Center Mean:____________Median:___________

Variation St. Dev__________Range____________

5 Number Summary Min______Q1_____Q2______Q3____Max____

Outliers______________

How is the median affected by the presence of an outlier?
How is the standard deviation affected by the presence of an outlier?

6.
Row1 2 3 4 5 6 7 8 9
1 1 1 0.10 1000.1 10 10000 10000 10000 10000000
2 2 11 0.20 1000.2 11 10001 10100 10010 1000000
3 3 21 0.30 1000.3 12 10002 10200 10020 100000
4 4 31 0.40 1000.4 13 10003 10300 10030 10000
5 5 41 0.50 1000.5 14 10004 10400 10040 1000
6 6 51 0.60 1000.6 15 10005 10500 10050 100
7 7 61 0.70 1000.7 16 10006 10600 10060 10
8 8 71 0.80 1000.8 17 10007 10700 10070 1
9 9 81 0.90 1000.9 18 10008 10800 10080 0.1
10 10 91 1.00 1001.0 19 10008 10900 10090 0.01
11 11 101 1.10 1001.1 20 10010 11000 10100 0.001
12 12 111 1.20 1001.2 21 10011 11100 10110 0.0001
13 13 121 1.30 1001.3 22 10012 11200 10120 0.00001
14 14 131 1.40 1001.4 23 10013 11300 10130 0.000001
15 15 141 1.50 1001.5 24 10014 11400 10140 0.0000001

Process the data sets by using the Explore data module.

Data set by column Standard Deviation Mean Coefficient of Variation
1
2
3
4
5
6
7
8
9

Which three data sets have the same standard deviation?

Apart from having the same value of the standard deviation, describe a way in which the three data sets are related.

What do you about the values of the data in column 9? What effect does this pattern have on the standard deviation in the set?

Do data sets with large values have large standard deviations, while those data sets with small values have small standard deviations?

What characteristic of a data set is most important in determining standard deviation?

The coefficient of variation measures standard deviation as percent of the mean. Which coefficient of variation is the largest? Which is the smallest?

Considering all nine data sets, what general trend do you observe that explains the differences among the coefficients of variation? Focus on each standard deviation and corresponding mean.