In the manufacture of a certain scientific instrument great importance is attached to the life of a critical component. This component is obtained in bulk from two sources, A and B, and in a course of inspection, the lives of 1000 of the components from each source are determined. The following frequency tables are obtained: Source A Source B Life (hours) No. of components Life (hours) No. of components 1000 – 1020 40 1030 – 1040 339 1020 – 1040 96 1040 – 1050 136 1040 – 1060 364 1050 – 1060 25 1060 – 1080 372 1060 – 1070 20 1080 – 1100 85 1070 – 1080 130 1100 – 1120 43 1080 – 1090 350 Examine the effectiveness of the measures of dispersion with which you are familiar for comparing the dispersion of the two distributions
In the manufacture of a certain scientific instrument great importance is attached to the life of a critical
component. This component is obtained in bulk from two sources, A and B, and in a course of inspection,
the lives of 1000 of the components from each source are determined. The following frequency tables are
obtained:
Source A Source B
Life (hours) No. of components Life (hours) No. of components
1000 – 1020 40 1030 – 1040 339
1020 – 1040 96 1040 – 1050 136
1040 – 1060 364 1050 – 1060 25
1060 – 1080 372 1060 – 1070 20
1080 – 1100 85 1070 – 1080 130
1100 – 1120 43 1080 – 1090 350
Examine the effectiveness of the measures of dispersion with which you are familiar for comparing the
dispersion of the two distributions
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