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615 randomly selected college students were asked if they were registered to vote. 234 of the 329 women and 186 of the 286 men responded yes. Give a point estimate for the difference between the proportion of college-aged women and the proportion of college-aged men who are registered to vote.
A battery manufacturer advertises the average life of its automobile battery is 60 months.what % of batteries should last between 50 and 70 months? The standard deviation is 10 months.
The critical values are values of the test statistics that separate the rejection region from the non rejection region. Is this true? Explain answer.
Assume a factory manager wishes to buy machines to perform a certain task in a production process. Certain key parts are produced by these machines.
A random sample is selected from a normal population. The population mean is 60 and the standard deviation is 15. after treatment the sample mean is 65. the sample size is 25.
A student scored 84 points on a test where the mean score was 79 and the standard deviation was 4. The student's z score was:
What is an independent sample and what is a related sample? When should researchers use varying hypothesis tests for the different types of samples?
In terms of measures of association, how is Lambda different from the other measures used for nominal level data?
The employees of a company were surveyed on questions regarding their educational background and marital status. Of the 600 employees
Obtain a test statistic and p-value. Interpret the results at = .01.
Use SPSS to make a scatterplot between stress and coping, and then add the fitted regression line to the plot. Mark both intercept and slope on the plot (You may consider to change the default X scale in SPSS)
According to the National Association of Homebuilders, the average life expectancies of a dishwasher and a garbage disposal are about the same: 10 years.
Linear programming problems. Computethe following linear programming problem. Among which of the following points (X,Y) is feasible.
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