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The Arizona Department of Transportation wishes to survey state residents to determine what proportion of the population would like to increase statewide highway speed to 75 from 65 mph. At least how many residents do they need to survey if they want to be at least 99% confident that the sample proportion is within 0.05 of the true proportion? Use a z-score rounded to 3 decimal places.
If the gas mileages are normally distributed with a standard deviation of 2.1, find the probability that a car has a gas mileage of between 29.2 and 30.3 miles per gallon.
Categorize the following as the example of nominal, ordinal, interval, or ratio level of measurement, and define why it represents this level: marital status of company's employees.
Suppose wheat and sugar are two basic ingredients necessary to bake two items: a loaf of bread and a muffin. A baker has 25 pounds of wheat and 5 pounds of sugar.
Illustrate what decision should be made depended on the mini-max regret criterion. Decision based on the Mini-max criterion.
The weights (in pounds) of a sample of five boxes being sent by UPS are: 12, 6, 7, 3, & 10.
the speed of a runner increased steadily during the first three seconds of a race. her speed at half-second intervals
when is it appropriate to use an anova? what is the key piece of information you must know in order to
a sample of 250 people resulted in a confidence interval estimate for the proportion of people who believe that the
What critical value t* from table D should be used to calculate the margin of error for a confidence interval for the mean of the population in each of the following situations?
Build or generate at least five more Pythagorean Triples using one of the many formulas available online for doing this. After building your triples, verify each of them in the Pythagorean Theorem equation
in the last quarter of 2007 a group of 64 mutual funds had a mean return of 1.2 with a standard deviation of 6.5.
question the manager of a frozen yogurt store claims that a medium-size serving contains an average of more than 4
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