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One hundred tractor-trailer trucks are weighed at a highway weigh station from a normal population. The average weight is 50,000 pounds with a standard deviation of 3600 pounds. Construct a 99% confidence interval for the average weight of the trucks in the population.
the amount of gasoline sold daily at a service station is a value of x of a random variable x that is approximately
Candidate A is running for president of the student government at a large university.
It is known that a healthy human body has an average temperature of 98.6?F, with a standard deviation of 0.95?F. Sixty healthy humans are selected at random. What is the probability that their temperatures average at least 99.1?F?
Pepsi wants to use this technique to determine if they should bid for an exclusivity agreement with NCSU. Such an agreement would bind NCSU to sell Pepsi soft drink products exclusively on campus.
Suppose business has been good and the company gives every employee a $50 raise. Tell the new value of each of the summary statistics.
Construct the ANOVA table (i.e. compute the between and within SS) and test if there appears to be any differences in means (use α = 0.05)
Using the appropriate statistical table, what is the most accurate statement we can make about the p-value for the test? Construct and interpret the 90% confidence interval for the difference between the population means.
Because of a recent incident in which a number of people became ill after eating undercooked hamburger meat, intensive interest has centered around the cooking time for hamburger patties.
Test the financial analyst's belief that the average rate charged by credit cards with monthly fees is less than 14%. Use a 5% significance level.
How does the shape of the quantile plot affect your interpretation of the results?
Suppose the weights of pucks produced at a factory are normally distributed with a mean of 5.75 ounces and a standard deviation of .11 ounce. What percentage of the pucks produced at this factory cannot be used by the National Hockey League?
A biologist with the Department of Agriculture is studying the growth of artichokes. She knows that the number of artichokes produced by each plant follows a distribution which is approximately normal.
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