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1. We ask if the attitudes toward fuel cost of 100 owners are hybrid electric cars (X=76) are different from those on a national survey of owners of non-hybrid cars (µ=65,σx=24). Higher scores indicate a more positive attitude. A) Is this a one or two tailed test? B) In words what is the H0 and Ha? C) Perform the z-test. D) What do you conclude about the attitudes here? E) Report your results in the correct format.
2. We measure the self esteem scores of a sample of statistics students, reasoning that this course may lower their self esteem relative to that of the typical college student (µ=55 and σx=11.35) We obtain these scores:
44 55 39 17 27 38 36 24 36
A) Summarize your sample data. B) Is this a one tailed or two tailed test? Why? C) What are the H0 and Ha? D) Compute zobt E) With α = .05 what is zcrit? F) What should we conclude about the relationship here?
Does the normal distribution yield a good approximation of the actual results?
Is it reasonable for the manufacturer to claim that the drill bits will last 2.5 hours?
You've administered a standardized test of manual dexterity to two groups of 10 semi skilled workers. One of these two groups of workers will be employed by you to work in a warehouse with many fragile items.
a. Formulate the null and alternative hypotheses. b. Which statistical test would you use? Why?
An experiment was performed to investigate lifetime of a component exposed to high heat. Three different oven types were used at either 550°F or 600°F.
Assume that a hand of 12 cards is dealt from a normal deck of 52 playing cards. What is the probability that of the 12 cards, 3 will be diamonds, 3 will be clubs, 3 will be spades, and 3 will be hearts.
Determining probability when guessing answers. Test comprise of multiple- choice questions each having 4 possible answers (a, b, c, d) one of which is right. Suppose that you guess answers to six such questions.
Find out equation of the line of best fit. Find out r - Is there a strong relationship?
Critically illustrate out the term standard deviation. Define mathematical averages. Why is the standard deviation less than the mathematical average?
The Warren County Telephone Company claims in its annual report that "the typical customer spends $70 per month on local and long-distance service.
Public transportation and the automobile are 2 methods an employee can use to get to work each day. Samples of times recorded for each method are shown. Times are in minutes.
Suppose you were a manager of a business. You can only pick on method to solve the LP problems, which method would you choose and Why?
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