Example 6 - 8. Technology Innovations

A survey of 18 high-tech firms showed the number of days' inventory they had on hand.Determine if the data are approximately normally distributed.

5

29

34

44

45

63

68

74

74

81

88

91

97

98

113

118

151

158

Solution:

Construct a frequency distribution and draw a histogram.

Draw a histogram.

Use the formula for the Pearson Coefficient of Skewness.Determine if there is an indication that the distribution is significantly skewed.

Check for outliers using the formulas for the lower and upper outlier boundaries.

Using these three indicators, the distribution is ___________________________ _______________________________________________________________.

Number of Runs Made

The data represent the number of runs made each year during Bill Mazeroski's career.Check for normalcy.

30

59

69

50

58

71

55

43

66

52

56

62

36

13

29

17

3

Solution:

Construct a frequency distribution and draw a histogram.

s

Draw a histogram.

Use the formula for the Pearson Coefficient of Skewness.Determine if there is an indication that the distribution is significantly skewed.

Check for outliers using the formulas for the lower and upper outlier boundaries.

Using these three indicators, the distribution is ___________________________ _______________________________________________________________.

question is not incomplete .....