Question

Drive (miles)

52

71

42

46

76

48

28

55

33

36

40

8

25

25

63

94

54

54

44

80

49

78

30

51

25

50

36

63

33

80

88

56

73

94

17

1. Find the mean and standard deviation of the DRIVE variable by copying that variable into the Week 1 spreadsheet.  Use the Week 4 spreadsheet to determine the percentage of data points from that data set that we would expect to be less than 25.  To find the actual percentage in the dataset, sort the DRIVE variable and count how many of the data points are less than 25 out of the total 35 data points.  That is the actual percentage.  How does this compare with your prediction?  

Mean: ______________             Standard deviation: ____________________

Predicted percentage:

Actual percentage:

Comparison ___________________________________________________

______________________________________________________________

2. What percentage of data would you predict would be between 25 and 50 and what percentage would you predict would be more than 50 miles?  Use the Week 4 spreadsheet again to find the percentage of the data set we expect to have values between 25 and 50 as well as for more than 50.  Now determine the percentage of data points in the dataset that fall within each of these ranges, using same strategy as above for counting data points in the data set. How do each of these compare with your prediction and why is there a difference?  

Predicted percentage between 25 and 50: ______________________________

Actual percentage:

Predicted percentage more than 50 miles:

Actual percentage: ___________________________________________

Comparison ____________________________________________________

_______________________________________________________________

Why?  __________________________________________________________

________________________________________________________________

Answer 1

Question 1:

Mean: 51.343             Standard deviation: 22.177

Predicted percentage: 14.3%

Actual percentage: Week 4 spreadsheet is not attached

Comparison Week 4 spreadsheet is not attached

Question 2:

Predicted percentage between 25 and 50: 34.3%

Actual percentage: Week 4 spreadsheet is not attached

Predicted percentage more than 50 miles: 48.6%

Actual percentage: Week 4 spreadsheet is not attached

Comparison Week 4 spreadsheet is not attached

answered by: anonymous