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The amount of income spent on housing is an important component of the cost of living. The total costs of housing for homeowners might include mortgage payments, property taxes, and utility costs (water, heat, electricity). An economist selected a sample of 20 homeowners in New England and then calculated these total housing costs as a percent of monthly income, five years ago and now. The information is reported below. Is it reasonable to conclude the percent is less now than five years ago?
Homeowner Five Years Ago Now Homeowner Five Years Ago Now
1 17% 10% 11 35% 32%2 20 39 12 16 323 29 37 13 23 214 43 27 14 33 125 36 12 15 44 406 43 41 16 44 427 45 24 17 28 228 19 26 18 29 199 49 28 19 39 3510 49 26 20 22 12
Two hundred raffle tickets are sold. Your friend has 5 people in her family who each bought two raffle tickets. What is the probability that someone from her family will win the raffle?
A company supplies poultry farmers with hens, advertising that a mature B300 Layer produces eggs with a mean weight of 60.7 grams. Suppose that egg weights follow a Normal model with standard deviation 3.1 grams.
A California lawyer practices law, on the average, for 30 years. Assuming these members remain steady, how many lawyers would you expect California to have in 2050.
Construct a 99% confidence interval for the proportion of customers favoring underground installation.
Past experience at the Crowder Travel Agency indicated that 44% of those persons who wanted the agency to plan a vacation for them wanted to go to Europe.
Ed Norris has developed a Web site for his used textbook business at State University. To sell advertising he needs to forecast the number of site visits he expects in the future. For the last 6 months he has had the following number of site visit..
Let X be the number obtained on the blue die minus the number obtained on the red die. Draw a histogram for its probability function and a graph for its distribution function.
Compute mean yearly value using average gas prices by month found in "Final Project Data Set." Using years as your x-axis and annual mean as your y-axis, design scatterplot and linear regression line.
In the following observational studies, describe changes that could be made to the data collection process that would result in an experiment rather than an observation study. Also, offer suggestions about unseen biases or lurking variables that m..
Change the frequencies to percentages - is there a group more likely to get high salaries.
Market researchers would like to know if customers prefer a well-known brand over a generic brand of soft drink. They give a large sample of people the two drinks to taste in a random order and ask them which one tastes better.
If you have a statistical package that computes binomial probabilities, find the probability that at least five funds outperform the market in all 10 years.
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