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There are 10 questions on a true-false test. A student feels unprepared for this test and randomly guesses the answer for each of these.
a. What is the probability that the student gets exactly 7 correct?
b. What is the probability that the student gets exactly 8 correct?
c. What is the probability that the student gets exactly 9 correct?
d. What is the probability that the student gets exactly 10 correct?
e. What is the probability that the student gets more than 6 correct?
Suppose the assembly times follow normal distribution. Find out z values for 29 and 34 hours. What percent of garages take between 32 hours and 34 hours to erect?
Suppose you had flipped a fair coin 19 times and "tails" had come up each time. The probability of now tossing a "head" on the 20th flip would then be:
What are the assumptions of regression analysis and how do you evaluate them?
Your employer asks you to determine whether current salaries (DV) can be predicted from years of experience (IV) What is the right statistical test one should use and why?
A car rental company has determined that the probability a car will need service work in any given month is 0.2. The company has 900 cars.
What would you recommend Taylor do to cut back its labor cost? (Illustrate using an ABC plan.)
Using the original data, test at the 5% significance level that the population standard deviation of studying times is greater than 4 hours.
What type of shape would you expect the histogram of the sample size to have? What value would you estimate for the mean of the histogram of sample means?
Pretest-posttest design and internal validity threats - please discuss all threats to internal validity.
Describe a research problem that would benefit from Factor Analysis. What are the variables and what would you hope to achieve?
Write the regression equation approximately. Computed the coefficient of determination(r 2 ).
Two semiconductor factories are being compared to see if there is a difference in the average defect rates of the chips they produce. In the first factory, 250 chips are sampled. In the second factory, 350 chips are sampled. The proportions of def..
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