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A survey of 117,156 women who were free of heart disease showed that 31,101 had at least one parent who had suffered a heart attack before age 60. Four years later, 133 of those with a positive family history of heart attack themselves had signs of heart disease, compared with 141 of those whose parent had not suffered a heart attack. (a) State the hypotheses for a one-tailed test to see if positive family history is associated with increased risk. (b) Obtain a test statistic and p-value. Interpret the results. (c) Is normality assured? (d) Is the difference large enough to be important?
Suppose that, from a population of 75 bank accounts, we want to take a random sample of six accounts in order to learn about the population. How many different random samples of six accounts are possible?
We want to test the hypothesis that the population variances are equal.
Calculate the paired sample t statistic for these mood scores and How has the relation between the mean and the median changed? What does this suggest about the distribution of the transformed data?
An experimenter is randomly sampling 5 objects in order from among 49 objects. What is the total number of samples in the sample space?
Determine the probability that a randomly selected teacher earns more than $525 per week?
How would you use the concept of probabilities to apply to profiles for hiring more satisfied individuals?
A student scores 81 on a chemistry test and 75 on a history test. For the chemistry test, the mean was 70 and the standard deviation was 20. For the history test, the mean was 65 and the standard deviation was 8.
You are given the following data. Test the claim that there is a difference in the means of the two groups. Use = 0.01. State the null and alternate hypotheses
Write a statistical laboratory report using the guidelines in the assigned article, "How to Write a Statistical Report."
For the following data set, indicate whether the shape of the distribution is normal, positively skewed, or negatively skewed. Provide evidence for your answer by calculating the mean, mode, and median.
A bonding company want to insure a construction projects completion. If the project is cancelled due to the contractor's lack of performance
A standard die has its faces painted different colors. Faces3,4,6 are red, faces 2 and 5 are black and face 1 is white.
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