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The owner of a mail-order catalog would like to compare her sales with the geographic distribution of the population. According to the United States Bureau of the Census, 21 percent of the population lives in the Northeast, 24 percent in the Midwest, 35 percent in the South, and 20 percent in the West. Listed below is a breakdown of a sample of 400 orders randomly selected from those shipped last month. At the .01 significance level, does the distribution of the orders reflect the population?
Region Frequency
Northeast 68
Midwest 104
South 155
West 73
Total 400
The pooled variance of two samples is:
The proportion of drivers who use seat belts depends on things like age, gender, ethnicity, and local law. As part of a broader study, investigators observed a random sample of 117 female Hispanic drivers in Boston; 68 of these drivers were wearin..
The U.S.Census Bureau announced that the median sales price of new homes sold i April 2009 was $221,660, and the mean sales price waas $274,300. Assume that the standard deviation of the prices is $90,000.
Draw the complete decision tree and determine whether the product should be launched or not.
A human resources director, on learning about the regression effect, decides to hire people who have been fired by their previous employer for poor performance.
Use the method of least squares to model the relationship between x and y.
A 'good' correlation is data-context driven. For example, I did a project correlating sales volume per state and customer demographics (pretty 'hard' data) and got a .92 correlation.
Which of these following statements provides the best guidance for the model building?
Find the critical value and test statistic value follows normal distribution.
Describe what do you mean by conditional probability. Give clinical example to support the explanation.
The average salary for graduates entering the actuarial field is $40,000. If the salaries are normally distributed with a standard deviation of $5,000, find the probability that
Find the test statistic value for two mean tests in large sample.
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