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The mean area of several thousand apartments in a new development is advertised to be 1250 sq. ft. An engineer measured a random sample of apartments:
1244 1245 1242 1245 1237 1245 1246 12321247 1245 1240 1234 1244 1243 1234 1238
The apartments sizes in the development vary Normally with o = 5 sq. ft. Is there good reason to believe that the mean is less than 1250 sq. ft? Why?
Given that this sample is extremely large, can the responses be considered to be representative of the population of the United States? Explain.
Assume a factory manager wishes to buy machines to perform a certain task in a production process. Certain key parts are produced by these machines.
Find out a 95% confidence interval for the proportion p of adults who have a great deal of trust and confidence in the executive branch of government.
Do you think this detection bias would strengthen or attenuate the association between vegetarian diet and learning disabilities? Defend your choice briefly.
Which of these following statements provides the best guidance for the model building?
According to an article, 19% of the entire US population have high-speed access to the Internet. Random samples of size 200 are selected from the US population.
Determine the mean and the standard deviation of the sample.
A contractor developed a multiplicative time series model to predict the number of contracts in future quarters, using quarterly data on number of contracts during the 3-year period from 1996 to 1998.
Find out best decision, by using following decision criteria.
What is your initial perception of this information? What are other ways, beyond looking at the p-value alone, you could use to try to interpret what this outcome of r(2398) = -.21 tells us about the relationship between length of time taking drug..
What is the probability that the mean price for a sample of 30 service stations is within $.03 of the population mean (to 4 decimals)?
The one-sample t statistic has the value t = -1.68. What do we know about the P -value of this test?
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