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An auto maker estimates that the mean gas mileage of its sport utility vehicle is 20 miles per gallon. A random sample of 8 such vehicles had a mean of 18 per gallon and a standard deviation of 5 miles per gallon. At α=0.05, can you reject the auto maker's claim that the mean gas mileage of its sports utility vehicle is 20 miles per gallon? Assume the population is normally distributed.
Report the test statistic and p-value. What is your decision and conclusion? State any assumptions you have made. Are these assumptions satisfied with these data?
Randomly selected medical resident works more than 100 hours in a week? (c) What is the probability that a randomly selected medical resident works less than 60 hours in a week?
What is a nonparametric procedure? Describe specifically when you would utilize a nonparametric test. Under what conditions should you use the Wilcoxon sum rank test?
Model Fitness. With any statistical model, we assess the fit: Does the model accurately depict the truth? Explain how one of the following helps assess the "fitness" of the mean.
What is the probability that a randomly selected monthly cell phone bill is more than $100?
A sample of 160 workers in the downtown area classified each worker by race. A bar graph of the results is given below, but the bar for black workers in the graph below has been omitted.
C-Spec has determined that the machine has a sample mean of 4.001 inches with a standard deviation of .002 inch. Calculate the (capability index) for this machine.
If the manufacturer's claim is true, what is the probability that the claim will be rejected?
Part 1: Define and explain historical research. Explain a situation in which historical research would be appropriate. Part 2: Explain the difference between external and internal evidence and give examples of each.
Final scores averaged 66 for the treatment group; the SD was 21. For the control group, the figures were 59 and 20. What do you conclude?
What is the probability that more than 25% of the business travelers say that the reason for their most recent business trip was an internal company visit?
What criterion would be used for rejecting the null hypothesis? Assume that the standard deviation, σ, of the population is known.
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