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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.
In multi-choice test, each question has four options. Students wil get 10 points for each correct answer; lose four points for each incorrect answer; and receive no points for unanswered questions.
Determine what analysis would you do on each problem (ie, one-sample z-test, one-sample t-test, proportion test, two-sample independent t-test, or paired test)?
Among Americans who are auto racing fans, 59% identify NASCAR as their favorite type of racing. What is the probability that all four have NASCAR as their favorite?
Can someone please break these problems down so that I can understand how to get the correct answer.
Should Katie conduct a between-subject ANOVA or a within-subject ANOVA? Describe your answer.
There is no proof the new policy is more effective, but we cannot finish the policy has no effect on smog. Interpretation of P-value for the given context.
The standard deviation of grade points was 0.65 and the mean was 2.89. The standard error for the sample was
Find a condition on the ci such that the estimate is unbiased. show that the choice of the ci that minimizes the variances of the estimate subject to this ondition is ci = 1/n where i=1,...,n.
If Mr. Cue were to order 1000 kilograms (instead of EOQ) of ivory at a time, what would be the length of the cycle between orders?
Suppose each employee in the company receives a $3000 raise for next year (each employee's salary is increased by $3000). The interquartile range of the salaries will
The sum of the cross-products of Z scores gives you a large positive number if there is a positive correlation and a large negative number if there is a negative correlation.
When 306 students are randomly selected and surveyed it is found that 115 own a car. Find a 99% confidence interval for the true proportion of all college students who own a car.
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