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An assistant to the mayor, who claims to understand statistics, complains about your confidence interval calculation. She asserts that the dollar losses from burglaries are not normally distributed, which in turn makes the confidence interval calculations meaningless. Assume that she is correct about the distribution of money loss. Why are the calculations of a confidence interval still appropriate? According to the central limit theorem any distribution is considered normal if n is greater than ____. This sample is 500 so the distribution of the sample means will be normal, no matter what the shape of the actual distribution of dollar losses.
Based on the information, what decision should the director make about the books used for the courses if the goal is to keep the cost below $300?
Develop an appropriate forecast model for the given problem whereas the student population has remained constant during this period.
Take a random sample and perform a t-test against a population mean (no time series for any parts of this project.) Test a hypothesis about a population mean.
The distribution of 9 ounce bags of a particular bag of potato chips is approximately Normal with a mean of 9.12 ounces and a standard deviation of 0.15 ounces.
When assigning probabilities of two simple events, can we assume that each event is always equally likely to occur and, thus assign .5 to each event?
A random sample of 100 computers showed a mean of 115 gigabytes used with a standard deviation of 20 gigabytes. What is the standard error of the mean?
Compute the probability of seven consecutive points falling above the centerline given a stable process. Is this probability associated with type I or type II error?
What proportion of sample means would be between 1.31 and 1.33 inches?
A better case can be made that observation 13 (Los Arboles) is an outlier. Describe what this means in plain terms.
The weight of a product is normally distributed with a mean of four ounces and a variance of .25 "squared ounces." What is the probability that the randomly selected unit from a recently manufactured batch weighs no more than 3.50 ounces.
A high of 10 was possible. A sample of five tests was selected from each group. The test grade results were: At the 0.01 level, what is the critical value?
Determine the cost Xs to develop the support system for which the probability of exceeding Xs is equal to 0.01?
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