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The mean area of several thousand apartments in a new development is advertised to be 1250 sq. ft. An engineer measured a random sample of apartments:
1244 1245 1242 1245 1237 1245 1246 12321247 1245 1240 1234 1244 1243 1234 1238
The apartments sizes in the development vary Normally with o = 5 sq. ft. Is there good reason to believe that the mean is less than 1250 sq. ft? Why?
Environmental Protection Agency (EPA) fuel economy estimates for automobile models tested recently predicted a mean of 24.80 mpg and a standard deviation of 6.2mpg for highway driving. Assume that a normal model can be applied.
What is the probability that at least one of the new books is a commercial success?
The mean of a standard normal probability distribution.
With a Rejection Region of 8, 9 or 10, what is the probability of a Type II error, if the job applicant has a probability of identifying the odd sample with p = 0.5?
Consider a four digit uniform random number generator; as in each of the 10,000 values 0.0000 through 9999 is equally likely. Find the mean and variance of the values produced by such a random number generator.
The χ 2 statistic from a contingency table with 6 rows and five columns will have:
Use the method of least squares to model the relationship between x and y.
Why then does it matter whether we assume straight-line or MACRS depreciation when we assess project NPV?
What is an example of two variables that are likely to be correlated because they are both changing over time?
A month is classified as "extremely wet" if the amount of rainfall is in the upper 10% for that month. How much precipitation must fall before a month of April is classified as "extremely wet".
Suppose that a researcher does a study to see how level of anxiety (A 1 = low, A 2 = medium, A 3 = high) is used to predict exam performance (Y).
Chi-square test for independent of attributes - A random sample of students is interviewed to determine if there is an association between class and attitude toward corporations?
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