Suppose the Environmental Protection Agency is in the
Chapter 6, Problem 20SE(choose chapter or problem)
Suppose the Environmental Protection Agency is in the process of monitoring the water quality in a large estuary in the eastern United States, in order to measure the PCB concentration (in parts per billion).
a. Suppose that a random sample of size 80 has a sample mean of 1.59 ppb and a sample standard deviation of 0.25 ppb. Test the hypothesis, at the 5% level, that the mean PCB concentration in the estuary is less than or equal to 1.50 ppb against the alternative that it is higher. Is \(H_0\) rejected?
b. If the population mean is 1.6 ppb and the population standard deviation is 0.33 ppb, what is the probability that the null hypothesis \(H_0:\mu \leq 1.50\) is rejected at the 5% level, if the sample size is 80?
c. If the population mean is 1.6 ppb and the population standard deviation is 0.33 ppb, what sample size is needed so that the probability is 0.99 that \(H_0:\mu \leq 1.50\) is rejected at the 5% level?
Equation Transcription:
Text Transcription:
H_0
H_0:mu{</=}1.50
H_0:mu{</=}1.50
Unfortunately, we don't have that question answered yet. But you can get it answered in just 5 hours by Logging in or Becoming a subscriber.
Becoming a subscriber
Or look for another answer