Part 1

Refer to the accompanying data set and use the 25 home voltage measurements to construct a frequency distribution with five classes. Begin with a lower class limit of 119.9 volts, and use a class width of 0.2 volt. Does the result appear to have a normal distribution? Why or why not?

Day Home Volts Day Home Volts Day Home volts 1 120.1 13 120.3 25 120.3

2 120.0 14 120.1

3 120.4 15 120.6

4 120.6 16 120.6

5 120.7 17 120.2

6 119.9 18 120.2

7 120.0 19 119.9

8 120.2 20 120.7

9 119.9 21 120.6

10 120.5 22 120.8

11 120.3 23 120.8

12 120.8 24 120.1

119.9-?

?-?

?-?

?-?

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