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Rutter Nursery Company packages its pine bark mulch in 50 pound bags. From a long history, the production department reports that the distribution of the bag weights follows the normal distribution and the standard deviation of this process is 3 pounds per bag. At the end of each day, Jeff Rutter, the production manager, weighs 10 bags and computes the mean weight of the sample. Below are the weights of 10 bags from today's production.
45.6, 47.7, 47.6, 46.3, 46.2, 47.4, 49.255.8, 47.5, 48.5
A. Can Mr. Rutter conclude that the mean weight of the bags is less than 50 pounds? Use the 0.1 significance level.B. In a brief report, tell why Mr. Rutter can use the z distribution as the test statistic.C. Compute the p-value.
Develop a 95% confidence interval for the population mean number of hours spent watching videos and DVDs last year.
Find out the least-squares regression line and interpret its slope.
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Determine the probability that particular call lasted between 110 and 180 seconds?
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If you are using the method of least squares for fitting trends in an annual time series containing 25 consecutive yearly values.
Normal with a standard deviation of 0.3 inch. How does the diameter of an orange at the 67th percentile compare with the mean diameter?
From time to time, one branch office of a company must make shipments to a certain branch office in another state. There are three package delivery services between the two cities where the branch offices are located.
Elephant came up twice as often as any other animal but that all the other animals came up equally often. Assuming there results were true, the probability of tossingan elephant is?
A fellow researcher fits a simple linear regression model Yi = α + βXi + ui by least squares, but has doubts that the first least squares assumption E(ui |Xi) = 0 is correct for her data set.
Assume the condition of Normality is met for the problem below. I also want to know the following elements: (Please do not use the Student t test, nor a Chi-square test) Two-tailed test ok?
The average salary for graduates entering the actuarial field is $40,000. If the salaries are normally distributed with a standard deviation of $5,000, find the probability that
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