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In previous tests, baseballs were dropped 24ft onto a concrete surface, and they bounced an average of 92.84% in. In a test of a sample of 40 new balls, the bounce had a mean of 92.67 in. and a standard deviation of 1.79 in. Use a 0.05 significance level to determine whether there is sufficient evidence to support the clam that the new balls have bounce heights with a mean different from 92.84 in. Does it appear that the new baseballs are different?
Briefly describe co relational research. Name a variable from this study and one from the workplace that might prove to provide a co relational relationship
Suppose the following statistics were calculated from data gathered from a randomized block experiment with k = 4 and b = 10:
In the solution to this problem, what is n? p? q? Does it appear that both np and nq are larger than 5? Why is this an important consideration?
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Estimate u with an approximate 95% confidence interval. Estimate p, the proportion of measurements in the population that are greater than 30, with an approximate 95% confidence interval.
A IRS auditor randomly selects 3 tax returns from 48 returns of which 9 contain errors. What is the probability that she selects none of those containing errors? Round to four decimal places.
The data below show the average daily high temperature for Chicago, Illinois, for twelve recent spring and summer months. Construct a stem-and-leaf diagram for the data:
What sample size must you take to be 96% confident that the results will be within $.75 of the true mean cost per call?
Assume that stock is currently selling for $100. The change in the stock's price throughout the nest year follows a normal random variable with a mean of $10 and a standard deviation of $20.
Are the companies equal from point of view of fat amount? Test at .02 significance level
Formulate the hypotheses that can be used to test the validity of the brokerage firm executive's claim.
The width of a confidence interval will be:
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