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1. A study was conducted to explore the relation between alcohol consumption and hypertension. 7400 nurses were surveyed and information about the amount of alcohol consumed per day (on average) and whether or not they suffered from hypertension was collected. The following table summarizes the information that was obtained.
Assuming the nurses surveyed were a random sample from the population of all nurses in the United States, we can use these data to test the null hypothesis H0 that there is no association between the row and column variables in this two-way table. The degrees of freedom for the X2 statistic for testing H0 isA. 3.B. 8.C. 9.19.
2. A study was conducted to explore the relationship between a child's birth order and his or her chances of becoming a juvenile delinquent. The subjects were a random sample of girls enrolled in public high schools in a large city. Each subject filled out a questionnaire that measured whether or not they had shown delinquent behavior, and their birth order. The data are given in the table below.
Under the null hypothesis, the expected number of oldest children with delinquent behavior is
A. 27.75.B. 37.12.C. 154.5.
Construct the 90% confidence interval for the true population proportion of all voters in the state who favor approval.
A study of 20 worldwide financial institutions showed the correlation between their assets and pretax profit to be .86. At the .05 significance level
An automobile manufacturer advertises that the mean petrol consumption of its new hybrid car does not exceed 4.6 litres per 100 km. An independent company decides to test the manufacturer's claim by selecting a random sample of 16 vehicles and mea..
two models of color tv sets designated alpha and beta are produced by allison company. the profit on alpha is 300 and
The goal at U.S. airports handling international flights is to clear these flights within 45 minutes. Let's interpret this to mean that 95 percent of the flights are cleared in 45 minutes
Which trend model do you think is best to make forecasts for the next 3 years? Why? (e) Use each of the three fitted trend equations to make a numerical forecast for 2007.
A sample of 25 undergraduates reported the following dollar amounts of entertainment expenses last year: Use the Empirical Rule to establish an interval which includes about 95 percent of the observations.
A financial adviser is interested in predicting bond yield based on bond terms, i.e., one year, two years, etc. What is the dependent variable?
Suppose that a certain college class contains 54 students. Of these, 34 are sophomores, 35 are psychology majors, and 7 are neither. A student is selected at random from the class.
What is the upper limit of the 95% interval? Give your answer to three decimal places. Which of the following assumptions should be checked before constructing the above confidence interval?
Find a 95% confidence interval for the mean monthly rent for unfurnished one-bedroom apartments available for rent in this community.
The conservative degrees of freedom for the t distribution are and The standard error, conservative degrees of freedom
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