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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.
Suppose that you're charged with comparing results of standardized tests from four different school districts. What statistical technique would you choose to use?
If the probability that it will rain tomorrow is 0.33, then what is the probability that it will not rain tomorrow?
A statistical analysis of 1,000 long-distance calls made from the headquarters of the Bricks and Clicks Computer Corporation indicates that the length of these calls is normally distributed with μ = 240 seconds and σ = 40 seconds.
An experiment was carried out to assess the effects of four tomato varieties and four planting densities on yield. There were 64 plots, and each of the 16 factor combinations was randomly assigned to 4 plots
Key Refining decided to send a special financing plan to charge account customers having the highest 10 percent of the money charges. What is the dividing point between customers who receive the special plan and those who do not.
The combined production level should not exceed 1200 units per month. The demand for product II is no more than half the demand for product I.
A random sample of 41 basketball players from The Official NBA Basketball Encyclopedia gave the sample standard deviation for player height as s=3.32 inches.
If the mean IQ of all Omega University students was equal to 115, and a small random sample of students was selected from the population whose mean IQ was 120, then this difference of 5 points would equal the:
What is the probability of selecting an accounting major, given that the person selected is a male?
Prepare a power curve for this decision rule
Based on these data, explain whether or not course attendance had any effect on determining of a restaurants violation of health code.
In the biology class the mean score was 79 with standard deviation 5.
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