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Suppose that a researcher does a study to see how level of anxiety (A1 = low, A2 = medium, A3 = high) is used to predict exam performance (Y).
Set up orthogonal coded dummy variables (O1, O2) to represent linear and quadratic trend, and run a regression analysis to predict exam scores from O1 and O2. What conclusions can you draw about the nature of the relationship between anxiety and exam performance?
Is there evidence of violations of the usual ANOVA assumptions of equal variances and normal populations? Set up and perform appropriate TESTS at the α = 0.05 level of significance.
At the .01 significance level, is there a difference in the use of the four entrances?
There were 3 defectives in the first batch and 5 in the second. Find a 95% confidence interval for the difference in the proportion of defectives.
What is the probability that a randomly chosen eight-week old baby smiles between 2 and 18 seconds?
Solve different inventory control problems using an appropriate OR method.
Construct a 95 percent confidence interval for the population mean. Is it reasonable that the population mean is 28 weeks? Justify your answer.
When combining probabilities, to find the probability of one event AND another event, the separate probabilities should be
Rank the funds by using this alternative measure of risk. Which, if any outperformed the market on the risk-adjusted basis.
At the .05 significance level, is there a difference in the proportion of viewers watching the three channels?
At the 0.05 level of significance, can we conclude Middletown students remained in their districts less time than Brockton students? Make use of 5-step hypothesis testing procedure.
what is the chance the average contents of the cans will be less than advertised and what will be the standard deviation of the number of men who help at home, based on the first survey
How strong is the evidence against the company's claim? Based on these data, the P -value of the appropriate test
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