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A group of businessmen consist of p(d)=40 % Democrats and p(d')= 60% Republicans. If p(s/d)=30 % of the Democrats smoke cigars, and p(s/d')=50% of Republicans smoke cigars also. What is the probability that a cigar- smoking businessmen is a Republican?
Assuming the sample size of 40 can be considered as large, compute the confidence interval for a confidence level of 90%.
A random sample of 225 SAT scores has a mean of 1522. Assume that SAT scores have a population standard deviation of 300. construct a 95% confidence interval estimate of the mean SAT scores.
The college theater department recently staged a production of a modern musical. A researcher recorded the gender of each student entering the theater and found a total of 385 females and 215 males.
Develop a multiple regression model with categorical variables that incorporate seasonality for forecasting sales using the last three years of data in the Excel file New Car Sales.
These individuals are then examined and categorized as to whether they have a heart disorder. The observed frequencies are as follows:
According to a survey reported in the Business Week, 30% of adults in the U.S. said that the cell phone is the invention that they hate most but cannot live without.
no children which is equal to value obtained by census. Give z statistic (rounded to two decimal places) and P-value. What do you conclude? (Use = 0.10.).
Determine the probability of examining a sample mean weight from any 20 women chosen from this population that is less than S (your sample mean) by using population standard deviation?
What is pooled variance and why is it important? Explain what interval data is and give an example: Write the formula for a problem that has 2 sample populations greater than 30 and the standard deviations are known and equal:
One of the problems encountered by corporations in America is finding an adequate number of employees who want to move into management. Recent surveys of workers in America taken by the Department of Labor in Washington D. C.
If a worker is known to strongly agree with the statementMy current job brings out the most creative ideas" what is the probability that the worker is engaged?
Consider a problem where we two products: Product A (cloth bags) and product B (leather bags). Each unit of Product A that is sold produces $30 in profit and each unit of Product B that is sold produces $50 in profit.
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