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The amount of snowfall falling in a certain mountian range is normally distributed with a mean of 105 inches, and a standard deviation of 16 inches. What is the probalility that the mnean annual snowfall during 64 randomly picked years will exceed 107.8 inches? Round your answer to four decimal places.
A rental agent claims that the mean monthly rent, , for apartments on the east side of town is less than $675 . A random sample of 18 monthly rents for apartments on the east side has a mean of $661, with a standard deviation of $24.
A researcher used stepwise regression to create regression models to predict Birth-Rate (births per1000) using five predictors:
The American Automobile Association checks the prices of gasoline before many holiday weekends. Listed below are the self-service prices for a sample of 15 retail outlets during the May 2003 Memorial Day weekend in the Detroit
A researcher wants to know if there is a relationship between a person's highest level of education (IV) and differences in life satisfaction (DV).
Analysis of variance- One way classification - Are there differences among these 3 drugs with respect to how long they are retained in the body?
Ace Machine Works estimates that the probability its lathe tool is properly adjusted is 0.8. When the lathe is properly adjusted, there is a 0.9 probability that the parts produced pass inspection.
A coin was flipped 60 times and came up heads 38 times. (a) At the .10 level of significance, is the coin biased toward heads? Show your decision rule and calculations. (b) Calculate a p-value and interpret it.
A new car is designed to run a mean of at least 50 000 kilometers before its first tune-up. Tests with 30 cars show a sample mean of 49 500 kilometers and a sample standard deviation of 1000 kilometers.
A company adminsters an "aptitude test for managers" to aid in selecting new management trainees. Prior experience suggests that 60 percent of all applicants for management trainee positions would be successful if they were hired.
A physician wanted to estimate the mean length of time µ that a patient had to wait to see him after arriving at the office.
In the past few years out sourcing over seas has become more frequently used than before by U.S. companies. However, out souring is not with out problems. A recent survey indicates that 20% of the companies that outsource over seas use consultant.
What is the appropriate procedure to test for a significant difference in means between the two groups? Implement the procedure in problem using the critical value method
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