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You're in charge of an experiment to evaluate a treatment which is advertised as being 90% effective at killing a particular insect. You plan an experiment in which the treatment is tested on 200 insects.
a. If the advertising is accurate, what is the expected value and standard deviation of the number of insects that ought to be killed in this experiment?
b. If the experiment resulted in 173 insects (of the 200) being killed by the treatment, would you be suspicious of the advertising claim? Explain briefly (a sentence or two at most) why or why not.
Explain how much should the airport authority be willing to pay for perfect information about the success of a brand new airport.
Assume that the process is in control and that the population of all jar fills is normally distributed.
Find out whether this is enough evidence to accept or reject manager's null hypothesis, using alpha = .01. Is this test left-tailed, right-tailed or two-tailed?
What is your conclusion regarding null hypothesis?
Statistics Questions Set: If the mean number of hours of television watched by teenagers per week is 12 with a standard deviation of 2 hours, what proportion of teenagers watch 16 to 18 hours of TV a week? (Assume a normal distribution.)
Richard is one of test takers. Find out the number of questions he can expect to get right on test by random guessing.
The probability that student pilot passes the written test for a private pilot's license is 0.7. Find the probability that the student will pass the test: (a) on the third attempt (b) before the fourth attempt.
Suppose population standard deviation for those drinking regular coffee is 1.20 cups per day and 1.36 cups per day for those drinking decaffeinated coffee.
The manager requires the estimate to be within 1.0 minutes of the population value. What sample size is needed?
The sample size n , the sample means, and the sample standard deviations for the two groups are given below.
Explain the distribution of mean of samples of size 15.
According to a recent survey of 500 randomly selected residents of Popular City, it was found that 38% are in favor of raising city taxes in order to build a new stadium for the local baseball team. (a) What is the population of interest of the su..
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