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An auto parts company is interested in how long people plan to own their cars. They collect the following data by asking 18 car owners how many years they will drive their current car from the time they bought it until they trade it in:
5 7 8 4 9 10 8 5 4 1 6 2 4 3 5 4 3 7
Make a 95% confidence interval for the length of time these car owners will keep their cars.
Callaway is thinking about entering the golf ball market. The company will make a profit if its market share is more than 20%.
The mean weight for a certain type of fish is known to be 28.0 ounces with a standard deviation of 2.5 ounces . A game warden catches and weighs 30 fish from a certqin pond to check if they are larger than the mean stated above.
In order to determine if the machine needs to be recalibrated, 84 randomly selected boxes of cereal from the next day's production were weighed.
In you determine the GPA of 10 members of the class and then calculate the average, will the number you get necessarily be the same as the average GPA for the whole class? On what factors would you expect the reliability of the estimate to depend..
According to a? survey, 57?% of the residents of a city oppose a downtown casino. Of these 57%, 7 out of 10 strongly oppose the casino.
1. the mean television viewing time for americans is 15 hours per week money november2003. suppose a sample of 60
At the 0.10 level, is the recommended action independent of the inspector? Based on the chi-square table, what is the most accurate statement that can be made about the p-value for the test?
An investment will pay $105 with probability 0.7, and $125 with probability 0.3. Find the risk (as measured by standard deviation) for this investment.
What if you were the fertilizer sales representative and your job was to prove the superiority of the new product to the farmer? You should start by running the same test he did in which he came to the decision that he could not conclude a differ..
Records of 40 used passenger cars and 40 used pickup trucks (none used commercially) were randomly selected to investigate whether there was any difference.
the following information gives the number of days absent from work for a population of 5 workers at a small factory.
The daily demand for rice at a departmental store in thousands of kilogram is found to follow gamma distribution with shape parameter 3 and scale parameter 1/z.
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