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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?
Random sample of 100 people yielded following data on number of tissues utilized in a cold: x-bar = 38, s = 20. By using sample information provided, compute the value of test statistic for the relevant hypothesis test.
In the history class the mean score was 76 with standard deviation 3.
A job placement director claims that the average starting salary for nurses is 24,000.A sample of 10 nurses' salaries has a mean of 23, 450 and a standard deviation of 400. Is there enough evidence to reject the director's claim at 0.05 level of s..
Suppose the download times for a commercial tax preparation site are normally distributed with a mean download time of 2.0 seconds and a standard deviation of 0.5 second.
There is sufficient evidence to support the claim that the mean speed of all cars on that section of I-10 is greater than the posted speed limit of 70 mph.
When the level of confidence and sample standard deviation remain the same, a confidence interval for a population mean based on a sample of n = 100
Based on the sample findings, estimate the true mean of Saturday sales with 90% probability.
An environmentalist estimate that the mean waste recycle by adults in the country is more than 1 pound per person per day. You want to test this claim, you find that the mean waste recycled per person per day for a random sample of adults in the c..
For a random sample of 12 days at the Downtown location, the mean number sold was 78.80 and the standard deviation was 14.25. At the .05 significance level, is there a difference in the mean number of hamburgers sold at the two locations?
A study group of long distance phone calls made from the corporate offices of Pepsi Bottling Group, Inc., in Somers, New York, revealed the length of the calls, in minutes, follows normal probability distribution.
Critically discuss the difference among strategic, long-term, and short-term objectives? What is the relationship between objectives and goals? What are examples of this relationship?
Play 100 games of scraps and empirically determine an estimate for the probability of winning.
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