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Perry Leblanc is a health officer with the government of Eurelia. For many years, the government has campaigned against smoking, and Leblanc would like to know something about the effects of the campaign.
a) He would like to know is whether it is reasonable to say that the incidence of smoking is about the same for all adult age groups. The following data have been collected from a random sample of 500 Eurelian adults.
16-24 25-39 40-64 <65
Smokers 32 35 35 28
Non-Smokers 128 105 85 52
Test at the 5% level whether the incidence of smoking depends on the age category.
b) Test whether the proportion of smokers in the 16-24 age category is significantly different from the proportion of smokers in the 25-39 age category. Use "alpha" = 0.20.
Find the probability that he will answer all 10 questions correctly.
Testing for equality of variances - Independent random samples were taken from normal distributions of the yearly production of ships built by the International Ship Building Company under
Tim has two more problems to solve on his test, but he doesn't know how long it will take to finish them. He assigns mutually irrelevant normal distributions to the times
If new inspector measures 101 stampings with variance of 0.13 square inch, test at 0.05 level of significance whether inspector is making satisfactory measurements. Suppose normality.
Normal adult Mean Temperature is 98.2 and standard deviant is 0.62 with normal distribution. If 16 people are randomly selected determine the probability that their mean body temp is below 98.5 degrees.
A member of Congress wants to determine her popularity in a certain part of the state. She indicates that the proportion of voters who will vote for her must be estimated within plus or minus 2 percent of the population proportion.
Develop 3 regression models to forecast selling price based upon each of other factors individually. Which of these is best?
For some positive value of Z, the probability that a standard normal variable is between 0 and Z is 0.3770. Find value of Z? For some value of Z, the probability that a standard normal variable is below Z is 0.2090. Find value of Z?
A study of the amount of time it takes a mechanic to rebuild the transmission for a 1992 Chevrolet Cavalier shows that the mean is 8.4 hours and the standard deviation is 1.8 hours.
Using ANOVA summary table, find out if regression model is significant.
Determine change in average number of weekly viewers from to?
Critically discuss the relationship between a sample and the type of population it is taken from? What population factors should be taken into consideration?
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