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The real estate assessor for a county government wants to study various characteristics of single family houses in the county. a random sample of 70 homes reveals that the average heated area of the house is 1759 square feet with a standard deviation of 380 square feet. estimate the 98% confidence level the average heated area of all single-family homes in the county
In a normal distribution of 1,000 aptitude test scores, with a mean of 60 and a standard deviation of 8, how many scores fall:
To test this notion, eight paid volunteers were placed (individually) in a room in which there was no light from the outside and no clocks or other indications of time.
In a group of college students there are 200 women, 10 of whom smoke. There are 150 men, 32 of whom smoke. Calculate the probability a randomly selected student is a woman or a smoker.
an investigator is interested in the posibility of merging the capabilities of television and the internet. a random
A psychologist is examining the influence of an older sibling in the development of social skills. A sample of 24 three year old children is obtained.
Compute the two weights that give the cutoff points for the three categories.
For each of the following, identify the scale of measurement (NOIR) and the best measure of central tendency for the data.
Known that 15% of walls painted with this paint need more than 55 minutes to dry completely. Find the standard deviation of this distribution.
Identify the population, the variable of interest, and the sample in the context of this problem. What are some inferences of possible interest to a stockbroker? How would the reliability of the inferences be assessed?
Sample data are reported for 50 employees of small companies, 75 employees of medium companies, and 100 employees of large companies.
Which measure of association do you use to compare the relationship between these variables? Why?
According to the historical data, the life expectancy in the United States is equal to the life expectancy in Germany. A new study has been made to see whether this has changed. Records of 225 individuals from the United States who died recently a..
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