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To ascertain whether a certain die was fair, 1,000 rolls of the die were recorded, with the following results.
Outcome
Number of Occurrences
1
158
2
172
3
164
4
181
5
160
6
165
Test the hypothesis that the die is fair (that is, that pi = 1 , i = 1, ... , 6) at the 5 percent level of significance. Use the chi-square approximation.
Heights were measured for a random sample of 20 plants grown while being treated with a particular nutrient. The sample mean and sample standard deviation of those height measurements were 39 centimeters and 12 centimeters, respectively.
The data show that acreage owned per family is normally distributed with a mean of 10.0 acres and a standard deviation of 1.5 acres. Calculate the percentage of families that own at least 8.1 acres
What is the probability that one of these trucks selected at random would get a) between 13 and 15 miles per gallon? b) between 10 and 12 miles per gallon?
You have been asked to analyse Grand Plomp Ltd, a maker of rocket widgets used by NASA. The owners are wondering whether the return received is sufficient to justify the risks taken in each division.
Consider babies born in the "normal" range of 37 - 43 weeks gestational age. Extensive data supports the assumption that for such babies born in the United States, birth weight is normally distributed with mean = 3432 grams and standard devia..
Find the P-value that would be used to determine if the percentage of customers who prefer mint chocolate chip ice has increased at a 5% level of significance.
How can you tell what are the solutions of a quadratic equation by looking at its graph? Explain.
The random variable x is known to be uniformly distributed between 1.0 and 1.5.
an airline has classified its customers as high-volume travelers assumed to be business travelers or low-volume
A random sample of 900 workers in a particular city found 342 workers who had full health insurance coverage. Find a 95% confidence interval for the true percent of workers in this city who have full health insurance coverage.
a research team plans to test the null hypothesis that ? .45 sigma.5. the test is right sided. a sample size of n1550
The researcher found that Abraham Lincoln's educational score did not correlate highly with the expected variable. What is wrong?
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