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A random sample of 200 married men, all re¬tired, were classified according to education and number of children:Number of childrenEducation 0-1 2-3 Over 3Elementary 14 37 32Secondary 19 42 17College 12 17 10
Test the hypothesis, at the 0.05 level of significance, that the size of a family is independent of the level of education attained by the father.
Find the test statistic value for two mean tests in large sample.
Please define correlation and regression. Describe a management or business-related scenario where a researcher might be interested in whether a number of variables are correlated (without any assumptions about causation).
Fuji Importers' tubes are 4 percent defective, Kirkpatricks' 7 percent, and Parts, Inc. are 6.5 percent defective. (a) What is the overall percent defective?
All else being equal, what occurs to your confidence interval when you increase value of alpha?
State the hypotheses for a right-tailed test. Obtain a test statistic and p-value assuming unequal variances. Why might the sample data not follow a normal, bell-shaped curve? If not, how might this affect your conclusions?
In a randomized, double-blind, placebo-controlled trial of children, echinacea was tested as a treatment for upper respiratory infections in children.
In a random sample of 16 mountain climbers who are going to attempt Mt. McKinley, what is the probability of each of the following?
What sample size is need if the agency wants to be 90% confidence of being correct to within +/- 5 minutes? if 90% is desired, how many listeners need to be selected?
Give null and alternative hypotheses for this test in symbolic form.
The negotiation will end successfully? After 4 hours? After 8 hours? How does the precentage likelihood of a successful negotiation change over the course of time?
Determine the mean and standard deviation of the data. What percentage of the data lies within one standard deviation of the mean value?
Determine expected cell counts if null hypothesis is true and show them in a two-way table. Determine the chi-square() statistic?
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