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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.
Increasing the confidence-interval level from .95 to .99
According to the National Institute for Occupational Safety and Health, job stress poses a major threat to the health of workers. A national survey of restaurant employees found that 75% said that job stress had a negative impact on their personal..
Secondhand smoke is somewhat harmful or very harmful. Is there statistically significant evidence against the representative's claim? Why or why not?
A standard deviation of 36 donuts. If a sample of 16 stores results in a sample average of 249 donuts what is the standard error of the mean?
A common error is neglecting to get ranked data for some statistical processes. Why do we have to have ranked data? Give an example of where you would need ranked data.
Find the values of the correlation coefficient and the coefficient of determination. Find the slope, y-intercept, and equation of the regression line for the data. Plot the points and a graph of the regression line on the same axes.
The library is to be given 3 books as a gift. The books will be selected from a list of 16 titles. If each book selected must have a different title, how many possible selections are there.
Avid poker player sees 100 hands a week, 52 weeks a year, for 20 years. What is the probability that she sees a royal straight flush dealt at least once?
Find the mean lifetime of this device? A electrical device consists of 4 identical components arranged so that the device functions if and only if all four components are working.
x and s are equal to 3.7 and 0.5, respectively, find a 99% confidence interval for the mean pH in rainfall and interpret the interval.
With a 98% level of confidence a company producing street signs wants to make sure the length of their product is meeting quality standards.
At the .01 significance level, can the manufacturer conclude that the price reduction resulted in an increase in sales?
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