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An economist is interested in studying the spending habits of consumers in a particular region. The population variance is known to be $1,000,000. A random sample of 50 individuals resulted in an average expense of $15,000. What is the width of the 99% confidence interval?
High levels of glucose in the blood are indications of diabetes, which is becoming more prevalent in the United States. Diabetes can lead to many complications such as blindness and heart disease. A random sample of 180 individuals had their blood su..
For the following hypothesis test where H 0 : m £10 vs. H a : m >10, we reject H 0 at level of significance a and conclude that the true mean is greater than 10 when the true mean is really 8.
Test the whether the attitude toward keeping weight down associated with smoking status.
What is the probability that all tree students pick a different card?
Find the value of k that makes f(x; y) a valid probability distribution.
What is the probability that: The amount requested is $80,000 or more?
X is a continuous random variable uniformly distributed on [20, 45] that is, the end points c = 20 and d = 45.
Test at 5% significance level null hypothesis that population mean is 40 hours against alternative that it is higher.
Test whether the relationship between the plan at retirement and residential area using Chi square test.
Construct a 98% prediction interval for the selling price of a 4l- year old house having 4500 square feet, 13 rooms, and an attached garage.
At 0.05 level of significance, is there evidence of significant relationship between age group and where people mainly get their news? If so, describe the relationship.
A random sample of 15 paired observations has a correlation of -.46. Can we conclude that the correlation in the population is less than zero? Use the .05 significance level.
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