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Suppose that you wanted to determine if your eastern region of wholesalers differed from your western region of wholesalers in the proportion of sales that they made to department stores. Your data show that the 80 eastern wholesalers had 40 percent of their sales to department stores, while the 60 western region wholesalers had 25 percent of their sales to department stores. The pooled estimate of the proportion of sales to department stores is approximately
What is the standard deviation of the sampling distribution of p(hat) the proportion of all rolls of the die that show a 1 or a 2? 3.) describe the shape of the sampling distribution of p(hat).
the specifications on an electronic component in a target acquisition system are that its life must be between 5000 -
Home mortgage interest rates for 30-year fixed rate loans vary throughout the country. During the summer 2000, data available from various parts of the country suggested that the standard deviation of the interest rates
problem 1 - of a random sample of 600 trucks at a bridge 114 had bad signal lights. construct a 95 percent confidence
Utilizing Excel data analysis calculate t distribution also deduce the result. Study of variance is used to investigate if there is a difference in the mean mileage of the three cars.
At the bottom of each model write the role that each variable plays in the model (i.e. dependent variable (DV), independent variable (IV), moderator, and mediator).
What is the response variable?
a manufacturer has designed a process to produce pipes that are 10 feet long. the distribution of the pipe length
Determine a 90% confidence interval for the mean weight of all university male first-year students.
How would one determine which combination of variables is the best (with statistical significance)? If that's not possible, can we show that one combination is statistically significantly worse than the others? What method would be used?
A scientist wants a confidence interval of 90% and a margin of error of +-2 for a mean of a Normal population with σ =10. What size samples should she take?
Suppose event A has a 0.99 probability of occurring and event B has a 0.98 probability of occurring.
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