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Mathematics, 18.12.2019 19:31 manco6
As part of a biological research project, researchers need to quantify the density of a certain type of malignant cell in blood. in order to assure the accuracy of measurement, two experienced researchers each make a sequence of separate counts of the number of such cells in the same blood sample. the 7 counts of the first researcher have a mean of 140.2 and a standard deviation of 17, while the 13 counts of the second researcher have a mean of 134.2 and a standard deviation of 15.1.
(a) use a level 0.99 pooled variance confidence interval to compare the mean counts of the two researchers:
? ≤μ1−μ2≤ ?
(b) does the interval suggest that there is a difference in the mean counts of the two researchers?
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