9. The human brain's delay in response to a sound has been found to be 5.68 milliseconds. A random sample of 10 participants is selected, and each subject
is asked to go without sleep for 24 hours before a test for brain stem auditory
response latency. The average latency is found to be 5.85 milliseconds, with s
= 0.14. Test the hypothesis that lack of sleep has no effect on average latency.

Assume that adults have iq scores that are normally distributed with a mean of mu equals 100 and a standard deviation sigma equals 20. find the probability that a randomly selected adult has an iq between 80 and 120.assume that adults have iq scores that are normally distributed with a mean of mu equals 100 and a standard deviation sigma equals 20. find the probability that a randomly selected adult has an iq between 80 and 120.