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The U.S. Postal Service is attempting to reduce the number of complaints made by the public against its workers. In order to facilitate this task, a staff analyst for the service regresses the number of complaints lodged against an employee last year on the hourly wage of the employee for the year. The regression equation finds:
Y = 20.2 - 1.2X with a r2 of .73
The Federal minimum wage is $7.25 (effective July 2009). If an employee earns the new minimum wage, how many complaints can that employee expect to receive?
Assume the researcher's rats can be considered an SRS from the population of all laboratory rats. The mean Math SAT score of these students is found to be 560, 80 points higher than the national average.
Suppose that an IQ test was given to a large group of persons, the scores are assumed to be from a normally distributed population, that mean = 100 and s (standard deviation) = 15.
Which of the following assumptions for inference about a proportion using a confidence interval are violated,
Assume the arrival of these emails i3 approximated by the Poisson distribution.
Use the t test to determine whether the slope of the regression model is significant at α = 0.05.
Determine probability of generating six digits and getting code consisting of 1, 2, 3, ..., 6 if each digit can be repeated?
Suppose the sample variance for 30 parts turns out to be s 2 = .0005. Use α = .05 to test whether the population variance specification is being violated.
Distinct random variable
The probability of obtaining a random sample mean, which is lower than the population mean, is:
Would it be reasonable to conclude that the population distribution is Poisson with a mean of 2.0?
The results of the simple linear regression are provided below.
A game involving a pair of dice pays you 3 with probability 17/36, costs you 2 with probability 14/36, and costs you 4 with probability 5/36. What is your probability of losing money in one play of the game?
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