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Commute times. The US census collects data on time it takes Americans to commute to work, among many other variables. The histogram below shows the distribution of average commute times in 3,143 US counties in 2010. Also shown below is a spatial intensity map of the same data.
(a) Describe the numerical distribution and comment on whether or not a log transformation may be advisable for these data.
(b) Describe the spatial distribution of commuting times using the map below.
Based on the sample data, can the cable company conclude that there is a relationship between the age of the customer and the payment method used?
Jeremiah has basketball practice two days a week. Ninety percent of the time, he attends both practices. Eight percent of the time, he attends one practice.
What is an independent sample and what is a related sample? When should researchers use varying hypothesis tests for the different types of samples?
Construct a scatterplot and verify that estimating a simple linear regression is appropriate in this problem.
if you assume returns follow a normal distribution, which investment has a better chance of giving you $40 million in returns.
In a nationwide survey of n = 1,030 adults, 6% answered yes to the question "During the last year did anyone break into or somehow illegally get into your home or apartment?"
An observer at a lake notices that when fish are caught, only 1 out of 9 trout is caught after another trout, with no other fish between.
Which error is more costly?- In the absence of any further information, which standard value will you recommend for α?
AT&T earnings in billions of dollars are estimated using GNP (gross national product). The regression equation is Y=.078+.06X where GNP is measured
Assuming the population standard deviation of the amount spent per owner is $12, construct and interpret a 95% confidence interval for the mean amount spent per owner for an obedience class.
Summary of results from a study of people who refused to answer survey questions.
Are sex and party affiliation related? Report the appropriate null and research hypotheses and the critical value (alpha = 0.05). In addition, provide your statistical conclusion, including calculation of test statistic and what the data suggests in ..
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