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The MacBurger restaurant chain claims that the waiting time of customers for service is normally distributed, with a mean of 3 minutes and a standard deviation of 1 minute. The quality-assurance department found in a sample of 50 customers at the Warren Road MacBurger that the mean waiting time was 2.75 minutes. At the .05 significance level, can we conclude that the mean waiting time is less than 3 minutes?
A faculty group wants to determine whether job rating (x) is a useful linear predictor of raise (y). Consequently, the group considered the linear regression model:
At 95% confidence, test to determine if more than 21% of the population will like the new soft drink.
A sample of 64 Atlanta consumers showed a mean quarterly water bill of $51 with a sample standard deviation of $12. At α = .05, does the Atlanta sample support the conclusion that above-average rates exist for this private water system?
Harry and Melissa Jacobson produce handcrafted furniture in a workshop on their farm. They have obtained a load of 600 board feet of birch from a neighbour and are preparation to produce round kitchen tables and ladder-back chairs during the next ..
Write the regression equation approximately. Computed the coefficient of determination(r 2 ).
Basic Statistics problem
Evaluate the result in part c with the decision using the expected value approach.
A Correlation matrix (correlation, coefficients and probability level under the hypothesis rho= 0) for a company's sales force (age, years of service, and current sales) is given below. Comment.
Give a possible description why serum cholesterol values for older males are lower than for younger males and reverse is true for females.
Test the equality of the means of three populations.
how many individuals will I need to sample if I want a 95% margin of error to be no more than 3%, I want to know if the results are significant at = 10%. With the information given.
Suppose there is no cyclical component. Quarterly billing for water usage is shown below describe summer billing for year 5.
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