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Question: A manufacturer of walk-behind push mowers receives refurbished small engines from two new suppliers, A and B. It is not uncommon that some of the refurbished engines need to be lightly serviced before they can be fitted into mowers. The mower manufacturer recently received 100 engines from each supplier. In the shipment from A, 13 needed further service. In the shipment from B, 10 needed further service. Test, at the 10% level of significance, whether the data provide sufficient evidence to conclude that there exists a difference in the proportions of engines from the two suppliers needing service.
An article in Forbes discusses the problem of oil and gas reserves around the world. Forecasting the amount of oil available is difficult.
A call option on common stock is being evaluated. If the stock goes down, the option will expire worthless.
Insurance policies ever have to pay out. You decide to test his claim at the a=0.1significance level. With a critical value of -2.33, compute the sample statistic.
Give it some gas! Computers in some vehicles calculate various quantities related to performance. One of these is fuel efficiency, or gas mileage.
Conduct a one-sided, right-tailed test of H0: µ = 1250 versus Ha: µ > 1250. Is there any evidence to suggest the true mean square footage is larger during.
Hospitials having fewer that 1000 discharges is estimated from a simple random sample of size 25. Use the central limit theorem to sketch the approximate sampling distribution of the estimate.
If the population mean was $1047 in the previous year, does the evidence suggest that expenditure this year has significantly changed?
Margin of error. Do you think that the margin of error for a sample of 10 would be larger or smaller than the margin of error for a sample of size 100?
For this Assignment, you will continue your practice as a critical consumer of research. You will critically evaluate a scholarly article related to one-way ANOVA testing.
The insect then chooses one of the two branches. Suppose that 45 of 75 insects choose the pheromone branch. The 95% large-sample confidence interval for the proportion of the population that prefers the pheromone branch is:
a. What kind of probability numbers are these, in terms of where they come from? b. Draw a probability tree for this situation.
Mary claims that the range, standard deviation and variance are all measures of dispersion. John adds to Mary's claim by stating that the coefficient of variation is a measure of relative dispersion.
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