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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?
One advantage of the repeated measures ANOVA is that it eliminates "individual differences" as a source of variability. Explain why there are no individual differences in the numerator and in the denominator of the F ratio.
He reviews the last eight months at dealership B and finds the standard deviation of the eight monthly sales to be 22.95. Using the .01 significance level does the analyst find evidence that the boast of dealership A is correct?
A company wants to know if minorities are more likely to be in certain job categories than others. Their data base codes employees 1 for clerical, 2 for custodial, and 3 for manager. A logistic equation was fit to the data with SPSS.
During the war with Iraq in 1991 the Terraco Motor Company produced a lightweight, all terrain vehicle code named "J99 Terra" for the military. The company is now planning to sell the Terra to the public.
Florida State University administers a mathematics placement test to students where they 1st enter the university.
The mean return for the random sample of 33 mutual funds is 14.93 percent with a standard deviation of 9.57. Test the null hypothesis: H0: mu = 15% at α = 0.05.
Suppose the sample variance for 30 parts turns out to be s 2 = .0005. Use α = .05 to test whether the population variance specification is being violated.
Find the Probability and inverse probability for the given Normal distribution.
What is the probability of this project being completed earlier than 19 days?
Find the margin of error for the estimator in this survey for a 95% level of confidence . In part c, what does the 95% level of confidence imply in relation to the margin of error?
He will then compare the season batting averages of group A (those with ballet training) and group B (those without ballet training) by comparing the mean of group A with the mean of group B.
What variables will be included, and collection methods used to obtain data. What is the population, sampling method used and why it is the best. Plan for data: describe what you will do with data once you have it, include types of graphs used and..
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