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A corporation has 2000 male and 500 female engineers. A stratified random sample of 200 male and 50 female engineers gives each engineer 1 chance in 10 to be chosen. This sample design gives every individual in the population the same chance to be chosen for the sample.
Suppose that the employee names are listed so that employees 1 through 2000 are male and employees 2001 through 2500 are female. We will select a simple random sample instead of the stratified sample described above. Enter the numbers 1 to 2500 into an Excel spreadsheet. Choose an SRS of 250 employees by using StatTools>Data Utilites>Random Sample. Select Data > Sort from the menu to sort your samples so that you can easily see how many are male and how many are female. (If StatTools does not let you do this exercise, please use Excel's RAND() function to create random variables between 0 and 1, sort your data and pick the first 250 as your sample.)
a. How many of the individuals selected in your sample are female?
b. How is the stratified sample different from the SRS?
Calculate the coefficient of skewness and coefficient of variation of minutes spent commuting. What do these statistics tell us?
A poll found that 38% of male voters and 46% of female voters support a particular candidate. To test whether this candidate has equal levels of support between male and female voters, the null hypothesis should be
Assume that the average person in America weighs 150 pounds (μ). You want to determine whether colleges students weigh less than the average America, Following are the weights collected on a sample of colleges students: 120, 105, 166, 170, 145, 14..
Based on these results, the proportion of the variation in 1993 winnings that is explained by the average number of putts per round and driving distance
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Indicate which would be the independent variable and which would be the dependent variable in each of the following:
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Suppose that during a basketball practice. Joe tries 3 shots from the free throw line; imagine further that he has a probability equal to 0.6 of making each shot and that the attempts are independent. Let 'X' be the number of baskets he makes in t..
There a flu epidemic that is spreading across SF County. You are a principle and are in charge of 32 teachers. You want to plan ahead and be able to estimate how many substitute teachers the school may need during this epidemic.
Draw the OC curve. If the average number of defects increased by to 10 per tractor, what would the probability of detecting the shift in a control chart?
A financial analyst is interested in estimating the average amount of a foreign loan by U.S. banks. Construct the Stratum weights for proportional allocation
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