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A safety researcher has measured the speed of automobiles passing his vantage point near an interstate highway. He has also recorded the number of occupants and whether the driver was wearing a seat belt. The data are shown in the following table with seat belt users coded as 1, nonusers as 0.
Using a computer statistical package, carry out a multiple regression analysis on these data, interpret the partial regression coefficients, and discuss the results of each significance test.
A sample of 25 concession stand purchases at the October 22 matinee of Bride of Chucky showed a mean purchase of $5.29 with a standard deviation of $3.02 for the October 26 evening showing of the same movie
In 2002, the Cinergy Corporation sold 35,615 million cubic feet of gas to residential customers, an increase of 1.1% over the previous year. Does this information represent descriptive statistics or inferential statistics? Why?
A researcher randomly assigns 12 participants to one of three weight-loss conditions (A-diet, B-exercise, C-medication). The researcher obtains the following data: What is the values of SStotal
What is the value of the test statistic, t? Should you reject or fail to reject the null hypothesis in this test? what is the approximate p-value for this test?
for the population of people who suffer occasionally from migraine headaches suppose that p 0.60 is the proportion
For the headache side effect, compute the risk of experiencing a headache for each drug (separately).- The relative risk of a headache for Drug 1 compared to Drug 2.
assume that a simple random sample has been selected froma normally distributed population and the test given
Two friends are to meet at the library. Each independently and randomly selects an arrival time within the same one-hour period. Each agrees to wait a maximum of ten minutes for the other to arrive. What is the probability that they will meet?
in this problem we explore the effect on the standard deviation of adding the same constant to each data value in a
For the following situation, assume the random variable is normally distributed and use a normal distribution or a t-distribution to construct a 90% confidence interval for the population mean. If convenient, use technology to construct the confid..
write an application that simulates coin tossing. let the program toss the coin each time the user presses the toss
a random sample of 100 computer chips made by a manufacturer were inspected and 8 were found to be defective.a
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