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Computer network manager wants to test the reliability of some new and expensive fiber-optic cables that the computer department just received. The department received 4 boxes, each containing 30 cables. The manager selects one cable at random from each of the four boxes. This sampling method is BEST described as:
A) Simple random sampling B) Cluster sampling C) Stratified random sampling D) Convenience sampling
Suppose that 30 people have been asked in a survey about how many hours they spend watching TV per day. Then, use these data to find a 95% confidence interval for the mean amount of time spent watching TV is 1.5 to 3.2 hours. Which statement is NOT t..
Why does a p-value provide a true measure of statistical significance? Try to relate your answer to previously covered concepts - example continuous probability distributions.
A manufacturing process produces semiconductor chips with a known failure rate of .If a random sample of chips is selected, approximate the probability that at most will be defective.Use the normal approximation to the binomial with a correction for ..
Captain Jack Sparrow is stranded on an island, awaiting rescue. Suppose that the probability for a ship to come by in a particular day is 20%. Assuming each day is independent of the next, for at least how many days should he wait (including the day ..
A sample of 100 yields x ¯ = 24. The population standard deviation is 12. If a = .05, find the acceptance/rejection region H_0 and determine if you accept or reject the hypothesis H_0 (Draw graph!).
1. Imagine yourself at a fair playing one of the midway games. Pick a game and calculate the expected value and post your results along with how you calculated them. For example, you may decide to throw a basketball to try to win a $10 bear. You paid..
A clinical trial is conducted comparing a new pain medication for arthritis. Participants are randomly assigned to receive the new medication or a placebo. The outcome is pain relief within 30 minutes.
Construct the 95% confidence interval estimate of the mean number of migraine attacks for those treated with acupuncture.
A company is considering producing two new products. Based on past records, management believes that there is 70% chance that the first product will be successful, and a 50% chance that the second product will be successful. As these products a..
The variance of each of the following sets of scores
The company wants to perform a hypothesis testing. Which of the following are the right hypotheses and what is the α-risk associated with the x' chart?
When performing a hypothesis test, you must make an assumption inorder to perform it. Assume that the hypothesis you are testing (the nullhypothesis) is true. This assumption allows you to calculate the probability ofthe test results. You then use th..
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