Question

Use the noise level data in the exam 1 data file in D2L to answer the following questions The data consists of a sample of 76 individuals working at a particular office and the noise levels they experienced, as reported in "Acceptable Noise Levels for Construction Site Offices, Build. Serv. Engr. Res. Technol., 2009: 87-94)

a. Determine the mean, median and modes.

b. Construct a histogram of the data. How many bins did you use? What was the width of the bins?

c. Calculate the skewness measure.

d. Calculate the z-score of the data (you do not need to report these). What is the minimum and maximum z-score. What is the proportion of observations that have z-score larger than 1.5?

Excel Data

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Noise Level (dBA)

55.3

55.3

55.3

55.9

55.9

55.9

55.9

56.1

56.1

56.1

56.1

56.1

56.8

56.8

57

57

57

57.8

57.8

57.8

57.9

57.9

57.9

58.8

58.8

58.8

59.8

59.8

59.8

62.2

62.2

63.8

63.8

63.8

63.9

63.9

63.9

64.7

64.7

64.7

65.1

65.1

65.1

65.3

65.3

65.3

65.3

67.4

67.4

67.4

67.4

68.7

68.7

68.7

68.7

69

70.4

70.4

71.2

71.2

71.2

73

73

73.1

73.1

74.6

74.6

74.6

74.6

79.3

79.3

79.3

79.3

83

83

83

Answer 1