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Whenever the calculated value of t is equal to or greater than the tabled value of t, for a given number of degrees of freedom, then
a) H0 is accepted
b) H0 is rejected
c) H0 is no longer relevant
d) the alpha level becomes zero
Determine the dependent variable(s)? Determine the value of the statistic? Write down the name of one variable not mentioned in this study that one might wish to control for.
An advantage of the permutation test over the t test for a difference in means, can Permutation tests be used for tests when we believe the two populations differ under the null hypothesis.
For each problem, compute a Welch F-statistic and determine whether or not significant differences exist among the treatment conditions.
Data in table represent number of consumer complaints against major U.S. airlines. If one complaint from table is arbitrarily chosen, determine the probability that it was filed against United Airlines.
At 0.05 level of significance, is there evidence that proportion of claims processed under this new system is higher than article reported for previous system?
The following table shows the number of miles driven in each trial.
Describe what you find then produce an ANOVA for the problem.
Make up a scatter diagram with 10 dots for each of the following situations:
In 1965, a newspaper carried a story about a high school student who reported getting 9207 heads and 8743 tails in 17,950 coin tosses. Is this a significant discrepancy from the null hypothesis H 0 = 1/2.
The Price-to-Earnings ratio (P/E) of a publicly listed profit-making company is defined as the ratio of the stock price of the company to the earnings per share.
What sample size must you take to be 96% confident that the results will be within $.75 of the true mean cost per call?
At 5% level of significance, does this sample prove violation of guideline that average patient must pay no more than $250 out-of-pocket? Write your hypotheses and decision rule.
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