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Regression and Correlation are two of the most often used and abused tools in research. People are quick to jump to conclusions that if a relationship exists between two variables, then one must cause (causation) the other. There are many reasons why two variables can be related without causality. Please respond to the following:
a. Comparing the amount of money people spend and the amount people save, your analysis revealed an R-squared=0.97. Should you use this for predictive purposes and why?
b. Comparing the number of cops on our streets and the number of reported crimes, your analysis revealed an R-squared=0.40. Should you use this for predictive purposes and why?
c. How could this apply in your profession?
a) Set up the null and alternative hypotheses, and perform the hypothesis test. b) Does the jury selection system appear to be fair?
Critically discuss some examples of descriptive statistics? Why are they used in research? What is a confidence interval?
Determine the likelihood of accepting a lot which is 1% defective?
In your organization's management development program, there was a heated discussion between people who claimed that theory is impractical and not effective
Given following financing project being considered by venture film, determine critical path probability of completion by 17 weeks.
Paul has calculated the indifference probability for the lottery having a payoff of $160K with probability p and -$80K with probability (1-p) as follows:
Support your contention with three examples from your experience at other organizations or departments. Where applicable, for each example, indicate what are the treatments and blocking variables.
At the significance level 0.01 is there sufficient evidence to conclude that a difference exists in the mean time required for the elimination of the rash?
You are given following information on residents' responses, broken down by sex. Determine the probability that resident is a man and opposes the bridge?
If alpha level is changed from a = 0.05 to a = 0.01. What occurs to boundaries for critical region?
Conduct post hoc comparisons with the LSD method. Which groups differ significantly at α = 0.05?
Use differential calculus to find both sales volume at which revenue is maximised and the maximum revenue available from sales of product X.
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