Introductory Biostatistics

The results in another group was obtained after MEP:

43 63 63 75 95 75 80 48 62 71 76 90

51 61 74 103 93 82 74 65 63 53 64 67

80 77 60 69 73 76 91 55 65 69 84 78

50 68 72 89 75 57 66 79 85 70 59 71

87 67 72 52 35 67 99 81 97 74 61 62

(a)Form a frequency distribution using the same intervals as in the first

table.

(b)Plot in the same graph and compare the two cumulative frequency

graphs: before and after the malaria eradication program.

2.11 In a study of water pollution, a sample of mussels was taken and lead
concentration (milligrams per gram dry weight) was measured from each
one. The following data were obtained:

f 113 : 0 ; 140 : 5 ; 163 : 3 ; 185 : 7 ; 202 : 5 ; 207 : 2 g

Calculate the meanx, variances^2 , and standard deviations.

2.12 Consider the data taken from a study that examines the response to
ozone and sulfur dioxide among adolescents su¤ering from asthma. The
following are measurements of forced expiratory volume (liters) for 10
subjects:

f 3 : 50 ; 2 : 60 ; 2 : 75 ; 2 : 82 ; 4 : 05 ; 2 : 25 ; 2 : 68 ; 3 : 00 ; 4 : 02 ; 2 : 85 g

Calculate the meanx, variances^2 , and standard deviations.

2.13 The percentage of ideal body weight was determined for 18 randomly
selected insulin-dependent diabetics. The outcomes (%) are

107 119 99 114 120 104 124 88 114

116 101 121 152 125 100 114 95 117

Calculate the meanx, variances^2 , and standard deviations.

2.14 A study on birth weight provided the following data (in ounces) on 12
newborns:

f 112 ; 111 ; 107 ; 119 ; 92 ; 80 ; 81 ; 84 ; 118 ; 106 ; 103 ; 94 g

Calculate the meanx, variances^2 , and standard deviations.

96 DESCRIPTIVE METHODS FOR CONTINUOUS DATA