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Question 1: In a study of distances travelled by buses before the first major engine failure, a sampling of 191 buses resulted in a mean of 154,700 km and a standard deviation of 60,000 km. At the 0.05 level of significance, test the manufacturer's claim that mean distance travelled before a major engine failure is more than 144,000 km. Use the 4 steps outlined in the examples in Module 13 to answer this question.
Question 2: A night time cold medicine bears a label indicating the presence of 600 mg of acetaminophen in each fluid ounce of the drug. Suppose that Health Canada randomly selected 65 one-ounce samples and found that the mean acetaminophen content was 589 mg and the standard deviation was 21 mg. Using α = 0.02, test the claim of the pharmaceutical company that the population mean is different from 600 mg. Would you by this cold medicine? Give your reasons.
Question 3: Use a significance level of α = 0.02 to test the claim that µ ≠ 64.8. The sample data consist of 12 scores for which the = 59.8 and s = 8.7.
Question 4: The expense of moving the storage yard for the Consolidated Package Delivery Service (CPDS) is justified only if it can be shown that the daily mean travel distance will be less than 342 km. In trial runs of 12 delivery trucks, the mean and standard deviation are found to be 318 km and 67 km, respectively. At the 0.01 level of significance, test the claim that the mean is less than 342 km. Should the storage yard be moved? Give your reasons.
If the names of these 100 people in the building are still unknown but a room is allowed to lodge one tenant at most , then are there how many ways of room occupation?
What are post hoc comparisons, and why do researchers make them? Why do researchers not use the Bonferroni procedure of procedures for post hoc comparisons?
Which of the given is the example of a discrete random variable? Which of the given is an example of continuous random variable?
If the production process is in control, the mean number of chips per cookie is 6.0 What is the probability that in any particular cookie being inspected. What is probability that in any partcular cookie being inspected, there are less than 4 choco..
Nationwide, the average time until a electric utility customer service representative answers a call is 260 second. The Gigantic Kilowatt Energy Company randomly sampled 30 calls and found that, on average, they were answered in 227 second with a ..
What is the level of measurement for there is no significant difference between marital ages of men and women? and ther eis a significant difference between marital ages between men and women.
What is the probability that at least one inspector will find a defective widget?
A contractor is considering a sale that promises a profit of $37,000 with a probability of 0.7 or a loss of (due to bad weather and such) of $18,000 with a probability of 0.3. What is the expected profit?
Construct a 99% confidence interval for the difference in the probabilities of getting a fracture for non-cola drinking and cola drinking kids.
A sample of 49 repairs showed an average overhaul of 285 hours with a standard deviation of 50 hours. Calculate a 95% confidence interval for the average overhaul.
Suppose you have the experiment of flipping a coin three times.
The sample mean and the standard deviation were determined to be 120 and 40 respectively. The standard error of the mean is?
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