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A real estate agent has surveyed houses in several nearby zip codes in an attempt to put together a comparison for a new property that she would like to put on the market. The 850 houses she surveyed have a mean price of $169,507 with a standard deviation of $61,708. The mean house size is 2,093 square ft, with a standard deviation of 505 square ft. (Use 2 decimal places for the questions below.)
Which is more unusual in this market: a house in that sells for $369,000 or a house with an area of 4,400 square ft?
The house that sells for $369,000 has a z-score of ______ , while the house with 4,400 square ft has a z-score of _________
Thus, the house with _______ is more unusual.
Suppose a company has a policy to hire workers only when each additional worker hired is more productive than the previous worker hired.
Develop a 90% confidence interval for the population proportion of adults who lack confidence they will be able to afford health insurance in the future.
Construct a scatter plot of these data. Describe the relationship between these two variables.- Compute the sample correlation coefficient. Does this value support your answer in part (a)? Why or why not?
Suppose that a survey is being planned for purposes of estimating the average number of hours spent exercising daily by adults (18 years of age or older) living in a certain community.
Produce a relative frequency histogram for these data. Does it seem plausible the data were sampled from a population that was normally distributed?
Dem bones Archaeopteryx is an extinct beast having feathers like a bird but teeth and a long bony tail like a reptile. Only six fossil specimens are known.
Mimi just started her tennis class three weeks ago. On average, she is able to return 15% of her opponent's serves
A sample of n observations is taken from a population. When performing statistical inference about a population variance, the appropriate chi-square distribution has:
A local grocery store wants to estimate the mean daily number of gallons of milk sold to customers. Assume the number of gallons sold follows the normal distribution with a population standard deviation of 5.10 gallons.
wetland ecologists often recommend including an island in the middle of wetlands to increase the retention time during
Describe the data for a correlational research study. Explain how correlational research is different from other research evaluating the relationship between two variables.
What is the probability that the sample will contain (1) exactly 1 "lucky" number, (ii) at least 1 lucky number, (iii) exactly 4 "lucky" numbers?
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