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Your company produces metal rods. They are required to be exactly 100cm long. From a quick survey, you find that, in a sample of 6 rods , the length is 99, 98, 99, 100, 98,100.
Draw your conclusions explaining your work and using the appropriate test.
A researcher wants to create a 99% confidence interval for the population mean. He has a sample of n=120, an x-bar of $340, and a sample standard deviation of $122. What is the margin of error?
Standard deviation of 10.6 points. The lower 5% of the class will not get a passing grade. Find the score that separates the lower 5% from the rest of the class.
The true average gas mileage for this new model, which of the following gives the null and alternative hypotheses that the consumer group should test?
Using α = .05, test to see whether the mean round-trip discount fare has increase in March. What is your conclusion? What is the p-value?
Which of the following is true regarding ANOVA? a) It is used to test for a difference in medians among three or more populations
Let X be the number obtained on the blue die minus the number obtained on the red die. Draw a histogram for its probability function and a graph for its distribution function.
FedEx and United Parcel Service (UPS) are the world's leading cargo carriers by volume and revenue (The Wall Street Journal, January 27, 2004).
1. determine if this is an example of probability or statistics the average cost of groceries has risen by 4.2 in the
Mr. James McWhinney, president of Daniel-James Financial Services, believes there is a relationship between the number of client contacts and the dollar amount of sales.
What is the null hypothesis? What is your decision if a = 0.01?
Suppose that, in a sample of 200, we observe 140 successes. Is this sufficient evidence at the 1% significance level to indicate the the population proportion of successes is greater than 65%
Construct a 95% confidence interval estimate for the population proportion of airline travelers who think that the airline fee that is most unreasonable is additional charges to redeem point/miles.
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