Based on previous studies of school children who were vaccinated and contracted the flu, the time in hours that the flu symptoms last is assumed to follow a normal distribution with a mean of 20.7 hours and a standard deviation of 7.3 hours. The probability that a randomly selected school child has flu symptoms for more than 24 hours is 0.1628 0.3256 0.6744 0.8372
Based on previous studies of school children who were vaccinated and contracted the flu, the time in hours that the flu symptoms last is assumed to follow a
0.1628
0.3256
0.6744
0.8372
Question 9
Suppose that a random sample of 5 vaccinated school children is taken. Assuming the distribution in Question 8, the probability that the mean time with symptoms is less than 18 hours is
0.2041
0.3557
0.6354
0.7959
Question 10
The researcher conducting the new study believes that the mean time with flu symptoms tends to be greater than 20.7 hours for unvaccinated school children. She takes a random sample of 10 unvaccinated children who contracted flu and records their times with symptoms. The appropriate non-parametric test the researcher should use is the
Wilcoxon Rank-sum test
Chi-square test
Sign test
F test
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