Question

5. White blood cells are the body's natural defense mechanism against disease and infection. The mean white-blood-cell count in healthy adults is 7.500 x 10/ul The white-blood-cell count in healthy adults is normally distributed with a standard deviation of 0.523 x10 ul. A company developing a new drug to treat arthritis pain must check for any side effects of the drug. A random sample of patients using the new drug was selected and the white-blood-cell count of each patient was measured. The results( x10 /ul) are given in the table below. 6.601 8.691 6.849 6.818 6.779 8.842 8.438 8.282 7.647 6.95 10.101 8.743 8.002 8.836 7.935 7.653 7.005 6.701 6.549 7.658 8.255 7.751 6.845 6.953 (a) Is there evidence at the 5% level of significance that the drug affects the (b) What proportion of the sample mean of the white-blood-cell count would (c) How many patients using the new drug should be sampled to give 98% white-blood-cell count? be less than 7.276x 10 /ul? confidence that the sample mean white-blood-cell count is within t 0.193x10/ul of the mean white-blood-cell count in healthy adults?

Answer 1

Hypothess Con be formulatod as -jenoio* 丶.se.3/阿 O 523 29 - 1.91o883 N1.91 24 0.19.3 о .193