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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 isA. 27.75.B. 37.12.C. 154.5.
The standard deviation of grade points was 0.65 and the mean was 2.89. The standard error for the sample was
The world record time (in minutes) in the marathon is plotted versus the year in which the record was set for men and women separately. The plotting symbol o is used for men and x for women. The data include only records set between 1908 and 1988.
Answer the following three questions based on what you know about statistics now.
The weight of the oranges, in pounds (1 pound = 16 ounces) is a random variable with standard deviation
The sample size n, the sample means, and the sample standard deviations for the two groups are given
To determine if this is evidence that students perform worse under uncomfortable conditions, The P-value of a test
What is the probability the average of the sample is more than $38000 and What is the standard deviation of the sample mean
Problems on Sampling Variability and Standard Error and Confidence Intervals
Do students tend to improve their SAT Mathematics (SAT-M) score the second time they take the test? A random sample of four students who took the test twice received the following scores
We want to know if his support has decreased. In computing a test of hypothesis with , what is the estimate of the overall proportion?
Which of the following models satisfies the rules of probability and The event corresponding to the above system functioning properly during one period of operation is
The conservative degrees of freedom for the t distribution are and The standard error, conservative degrees of freedom
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