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The average gas mileage of a certain model car is 29.0 miles. If the gas mileages are normally distributed with a standard deviation of 0.6 miles per gallon, find the probability that the car has a gas mileage of between 28.8 and 29.2 miles per gallon.
In order to estimate the difference between the average hourly wages of employees of two branches of a department store, the following data have been gathered.
Calculate the mean, mode and median of the grouped data derived from the frequency distribution above. Compare the results obtained from
Calculate a 95% confidence interval for the mean endowment of all the private colleges in the United States assuming a normal distribution for the endowments.
Calculate the difference in the average "clutter" between network and TV.
Prepare an ANOVA table and test the null hypothesis of no linear relationship between the two variables.
We are interested in testing to find out whether the variance of the population is vitally more than 0.003
Assume that you choose a 50 families sample. Which is the form expected from the distribution of the average or median of the sample?
Make a forecast for 2004, using either the fitted trend model or a judgment forecast. Why is it best to ignore earlier years in this data set?
Perform a proper analysis. Describe your null and alternative hypothesis, report the p-value. What is your conclusion?
Students in the social work course received the following course grades. Create a frequency distribution for this data. Compute the mean. Determine the median.
The probability that student pilot passes the written test for a private pilot's license is 0.7. Find the probability that the student will pass the test: (a) on the third attempt (b) before the fourth attempt.
Test the mean cholesterol content in the egg is greater than 2.5 percent
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