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Find the whether the given correlation is significant at given level of significance.
(A) Is sample correlation coefficient r= 0.820 significant at =0.01level based on a sample size of n = 7data pairs? What about n =9 data pairs?
(B) Is a sample size correlation coefficient r =0.40 significant at = 0.05 level Based on sample size of n=20 data pairs? What about n=27 data pairs?
(C) Is it true that in order to be significant, an r-value must be larger than 0.90? Larger than 0.70? Larger than 0.50? What does sample size have to do with the significance of r? Explain.
Construct the 90% and 95% interval estimates for the population mean weekly sales.
Find out which (t-, z- or neither) distribution is suitable Then if you can utilize either a t- or z- distribution, provide associated critical value (critical t- or z- score) from that distribution to reach given confidence level.
A sample of 100 observations has a mean of 2.99 and a standard deviation s equal to 0.5 Conduct the following test of hypotheses about the corresponding population mean at a level of significance of α = 0.2
In order not to violate the requirements necessary to use the chi-square distribution, each expected frequency in a goodness of fit test must be:
Computation of Expectation, Variance and Covariance.Calculate the variances of Y1 and Y2.
Finding the value of test statistic utilizing two-tail 't' test also interpret the result. The Commercial Bank as well as Trust Company is studying the use of its automatic teller machines.
Find the probability of exactly 6 Mexican-Americans among 12 jurors.
At the .05 level of significance, can we conclude that those joining Weight Reducers on average will lose less than 10 pounds? Determine the p-value.
What is the probability that the sample mean will be greater than M = 510. In symbols, what is p (M>510)?
P-value to test hypotheses,
A local group claims that the police issue more than 60 speeding tickets a day in their area.
Let x be average number of employees in group health insurance plan and y be average administrative cost as percentage of claims. Determine sample correlation coefficient.
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