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To test whether there is any association between the two variables using Chi-Square test for independence.
A researcher is interested in studying the relationship between salary levels and unionization for public employees. Specifically, the researcher hypothesizes that public sector employees who are unionized have higher salary levels than public sector employees not unionized. Random sampling police departments in 100 cities, the researcher constructs the cross-tab below.
Salary
Union
Nonunion
TOTAL
High
21
29
50
Low
14
36
35
65
100
Discuss whether the percent distribution of the cross-tab and chi-square supports/does not support the researcher's hypothesis.
Assuming that the Poisson distribution is a plausible model in describing variability of asbestos fiber counts in filters; derive a 95% confidence interval indicating the variability in the average number in asbestos fibers.
Explain the logic of what you have done, writing as if you are speaking to someone who has never heard of correlation (but who does understand the mean, deviation scores, and hypothesis testing);
The number of standard errors that the sample estimate (p 1 - p 2 ) of (p1 - p2) falls from its null hypothesis value of zero is called
If 1 man aged 18-24 is arbitrarily chosen, determine the probability that his serum cholesterol level is between 165 and 200.
Compute β-error of test in part (a) if true difference in mean burning rate is 2.5 centimeters per second.
A scientist examined the effect of temperature and catalyst on the yield of a reaction. He ran the experiment at both 150° and 200°C with two types of catalyst.
At 0.05 level of significance, is there evidence that proportion of claims processed under this new system is higher than article reported for previous system?
Below is a plot of the Olympic gold medal winning performance in the high jump (in inches) for the years 1900 to 1996.
Which of following statements would be right concerning a twotail test at 0.05 level of significance? We can conclude that average cottage cheese consumption in America is at least 0.705 pound more or less than 2.75 pounds per person per year.
What happens to the expected return and standard deviation of returns of the portfolio in Part a if the following conditions exist?
In a normal frequency distribution, 32% of the cases:
Compute a 95% confidence interval for the mean using the formula and where is the mean of the ten random numbers.
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