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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 or correlation 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:
-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?
-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?
-How could this apply to the military?
In a survey of 400 adults that say traffic is a problem: East reported 36% is a problem, South 33% problem, Midwest 26% problem and West 55% problem.
What are some effective supply methods for dealing with maintenance, repair, and operating (MRO) requirements?
Construct a 1. 90% confidence interval for the population mean; 2. 95% confidence interval for the population mean; 3. 99% confidence interval
Give an example of a problem dealing with two possibly related variables (Y and X). What is the impact of using a linear regression model in this case
If n = 10 observations are sampled from each group, determine the value estimated by MSBG and comment on how this differs from the value estimated by MSWG.
An efficient way of computing probabilities in the binomial (n, p) distribution to any desired degree of accuracy is to use the following method.
Consumers spend of $21 per week in cash without being aware of where it goes. Assume that the amount of cash spent without being aware of where it goes is normally distributed and that the Standard Deviation is $5 a.) What is the probability that ..
If we performed 20 different linear regressions at the 0.10 level, how many of these would we expect to show significance by chance?
Find out the expected number of correct responses under these circumstances if one in fact selects the responses at random. What is the standard deviation?
Modify the program again to print out, every 100 times, both of the following quantities: the proportion of heads minus 1/2, and the number of heads minus half the number of tosses. Do these numbers appear to approach 0 as n increases?
Assume that they are equally likely to want to go to floors 2 through 10 (independently of each other). What is the probability that the buttons
What is the median number of letters written by females?- What is the median for males?- Explain whether the interquartile range is larger for males or for females.
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