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A university in 1985, a proportion of .47 of sociology majors were women. You assess the gender composition of a random sample of 187 sociology majors at the same university today and discover 105 females. Test a hypothesis to see if this proportion has changed since 1985. I have the standard error and a t-score of 1.660. I need the test effect, test statistic and p-values.
No estimate of the population proportion is available. How large a sample is required?
Public transportation and the automobile are two methods an employee can use to get to work each day. Samples of times recorded for each method are shown. Times are in minutes.
Explain what the coefficient of determination, R^2 (R-squared), measures. How is it related to the sample correlation coefficient?
Construct a 95% confidence interval estimate for the population proportion of administrative professionals who prefer cash bonuses.
Here are the DMS odor thresholds for 10 untrained students:
Construct a scatter plot of P-RFM and P-HELM. If drawing the plot by hand, use graph paper to ensure accuracy.
Extra college-level training, and rest of the sailors arn't accounted for. How does your sample compare to what you expected to determine? Define null hypothesis.
Use alpha level. 05 to compute and interpret Pearson's r and to test whether it is important (using all your steps for hypothesis test).
The diameter of stabilizing O-Rings washers manaufactured at a large factory is expected to be normally distributed with a mean of 1.30 inches and a standard deviation of 0.04 inches.
A single test on a certain device costs more than the entire lot. It is therefore decreed that not more than three tests will be performed per lot.
At a large department store, the amount a shopper spent and the shopper's gender (male or female) were recorded. To determine if gender is useful in explaining the amount of money a shopper spends at the store we could
Ace Machine Works estimates that the probability its lathe tool is properly adjusted is 0.8. When the lathe is properly adjusted, there is a 0.9 probability that the parts produced pass inspection.
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