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Here's the question: Suppose that in a certain population of married couples 30% of the husbands smoke, 20% of the wives smoke, and in 8% of the couples both the husband and wife smoke. Is the smoking status (smoker or nonsmoker) of the husband independent of that of the wife?
Find the equation of linear regression for the above data and obtain the expected salary for an engineer with 48 years of experience. Round to the nearest $100.
Find out the forecast value utilizing three month moving average method, weighted moving average method, exponential smoothing and regression methods.
Suppose we analyzed the effect of grade point averages on grades in a specific class and found the results to have an R-aquared value of 0.53. What do we know? Are there other factor, neith or fifty three percent of the variability?
the observed rate of drinking was the same in both cases although the sample size of the latter was twice as big. The critical region {X ¯>c} and p-value for the two cases are respectively?
If 1000 men and 1000 women are to be interviewed, how accurately could you estimate the difference in the proportions who think that the performance of their atheltics teams has a positive impact on the perceived prestige of the institutions? Find..
A random sample of 65 packages yielded a mean of 1.05 lbs and a standard deviation of .23 lbs. What is the 90% Confidence Interval for this problem?
The following table shows SAT scores (on the old SAT with only two sections) for a sample of students. Give the equation of the least squares regression equation.
Department decided to conduct the test at the 0.05 level of significance whether the modification actually increased the life of the AAA battery. What was their decision rule?
The average age of statistics students nationwide is 22. The standard deviation is 2.5 years. Assume the age is a normally distributed variable. Find the probability that one student selected at random is older than 23.
23% of college students say that they use credit cards because of the rewards program. you randomly select 10 students who say that they use the credit card because of its rewards program.
Use the expected collision payment to determine the collision insurance premium that would enable the company to break even on the policy.
Serum cholesterol levels were taken from a population of 10,000 college students. The results were normally distributed. Males had a mean of 195 and a standard deviation of 10. Females had a mean of 185 and a standard deviation of 12.
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