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Downs and Abwender (2002) found neurological deficits in soccer players who are routinely hit on the head with soccer balls compared to swimmers, who are also athletes but who are not regularly hit in the heads. Is this an example of an experimental or a non-experimental study? Why?
The president of Crooked Arrow National Bank wants to determine whether more than 60% of the banks loans are made to persons residing in Crooked Arrow.
What information is provided by the numerical value of the Pearson correlation? For the following scores, compute the Pearson correlation:
A certain model of remote-control Stanley garage door opener has nine binary (off/on) switches. The homeowner can set any code sequence.
Construct a 90% confidence interval for the population proportion, p, in order to test the claim from a confidence interval point of view. What is the best point estimate for p?
Why is it significant to be familiar with frequency distributions in the business world? Provide examples by using a distribution chart from a set of data.
Did you find any outliers on the dependent variables that were due to errors of coding? If so, what and why? How would you correct an error of coding?
If p(s/d)=30 % of the Democrats smoke cigars, and p(s/d')=50% of Republicans smoke cigars also. What is the probability that a cigar- smoking businessmen is a Republican?
Based on the information, what decision should the director make about the books used for the courses if the goal is to keep the cost below $300?
A manufacturer uses a new production method to produce steel rods. A random sample of 17 steel rods resulted in lengths with a standard deviation of 21.1cm.
List all samples of size 2, and compute the mean of each sample. Compute the mean of the distribution of sample means and the population mean. Compare the two values. Compare the dispersion in the population with that of the sample means.
A manufacturer claims that fewer than 6% of its fax machines are defective. In a random sample of 97 such fax machines, 4% are defective. Find the P-value for a test of the manufacturer's claim.
Machine X test unit cost $3000 with beta=3 and theta=500, Machine Y test unit cost $2000 with beta=3 and theta=400. If the machines oil fixtures has life of 20 hrs, which machine goes to market first?
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