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Question - Is the number of tornadoes increasing? In Exercise 10.19 (page 512), data on the number of tornadoes in the United States between 1953 and 2009 were analyzed to see if there was a linear trend over time. Many argue that the probability of sighting a tornado has increased over time because there are more people living in the United States. Let's investigate this by including the U.S. census count as an additional explanatory variable.
(a) Using numerical and graphical summaries, describe the relationship between each pair of variables.
(b) Perform a multiple regression using both year and population count as explanatory variables. Write down the fitted model.
(c) Obtain the residuals from part (b). Plot them versus the two explanatory variables and generate a Normal quantile plot. What do you conclude?
(d) Test the hypothesis that there is a linear increase over time. State the null and alternative hypotheses, test statistic, and P-value. What is your conclusion?
A recent study of minimum wage earners found that 51.3% of them are 16 to 24. suppose a sample of 600 minimum wage earners is selected. is it appropriate to use the normal approximation to the binomial distribution.
general instructionsuse the spss data file produced from the national child development study ncds to answer the
In the report, the researchers stated, "These results remain significant after adjustment for socioeconomic status." What does this mean? Can we conclude that a television in the bedroom causes a higher body mass index? Explain.
A random sample of the price of gasoline from 20gas stations in a region gives the statistics below. Complete parts a) and b) ybar = $3.59, s = $0.24 a) Find a 95% confidence interval for the mean price of regular gasoline in that region. __, __ (R..
write a hypothesis for the following statementsa. the health department is charged with finding out if the rate
Specify the probability distributions for each chance node, Draw a complete decision tree for GPC. Solve the decision tree using EMV. What should GPC do?
According to the regional bar assoc., 60% of people who take the bar exam pass. Find the approximate probability that at least 61% of 200 randomly selected people taking the bar will pass. Round to three decimal places as needed.
Conduct a two-tailed test of equality of mean stock return in the population of all stocks before and during the antitrust trials using the following data:
The data table below tabulates a pizza parlor's advertising expenditures and sales for 8 consecutive quarters. The marketing manager wants to know how much of an impact current advertising will have on sales two quarters from now.
the 70-year long-term record for weather shows that for new york state the annual precipitation has a mean of 39.81
1. During his career in the NHL, hockey great Wayne Gretzky had the following season-total goals for each of his 20 seasons. Source: The World Almanac and Book of Facts 2000, p. 954.
What is the mean value of a geometric random variable? What is the mean value of N, the number of tosses of a fair coin until the fourth head occurs?
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