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The national median sales price for new single-family homes is $230,000 (The Associated Press, March 25, 2006). Assume that the following data were obtained for sales of existing single-family homes in Houston and Boston.
Greater than $230,000 Equal to $230,000 Less than $230,000
Houston 11 2 32Boston 27 1 13
a. Is the median resale price in Houston lower than the national median of $230,000? Use a statistical test with ? = 0.05 to support your conclusion
b. Is the median resale price in Boston higher than the national median of $230,000? Use a statistical test with ? = 0.05 to support your conclusion
Of the 500 students who responded to a survey about recycling on campus, 350 said they recycle on a regular basis. The sample proportion is ??
The standard deviation of the differences d for the paired sample data s d = ____________
Place a 95% confidence interval about the population mean number of down hours per month.
A sample of 60 smokers has a mean cotinine level of 125. Assuming that sigma=25, find the 90% confidence level estimate of the mean cotinine level of all smokers.
What would be the critical value under the null hypothesis if the size of your test were 5%?
The Evergreen Fertilizer Company produces fertilizer. The company's fixed monthly cost is $25,000, and its variable cost per pound of fertilizer is $0.15.
A suburban hotel derives its gross income from its hotel and restaurant operations. The owners are interested in the relationship between the number of rooms occupied on a nightly basis and the revenue per day in the restaurant.
Solar cells are attached to a panel with a new heat resistant adhesive. The adhesive must provide 2.80 pounds of force in order to hold the cell on the panel. A random sample of 50 cells is tested and the following forces are necessary to break th..
In a shipment of 56 vials, only 13 do not have hairline cracks. If you randomly select one vial from the shipment, what is the probability that it has a hairline crack?
Explain the general process and the steps included in conducting a hypothesis test? What is the difference between parametric and nonparametric hypothesis testing?
What is the purpose of sampling? What are some concerns and dangers of sampling? How important is the sample design to data validity? Explain.
Determine fraction of employees cost between $1,500 and $2,000 per year?
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