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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?
When performing a chi-square test for independence, explain how the "cell frequencies under the independence assumption" are calculated.
According to the historical data, the life expectancy in Argentina is equal to the life expectancy in Bolivia. A new study has been made to see whether this has changed.
Using a present value table, your calculator, or a computer program present value function, answer the following questions. Assistance is needed with the formula to calculate the problems:
What would be the most appropriate graphical representation to show the dispersion of new home prices in a particular area? Why?
In fitting the simple linear regression model Yi ~ N (α + β xi, σ 2 ) to the following data:
Spinning a coin, unlike tossing it, may not give heads and tails equal probabilities. I spun a penny 200 times and got 83 heads. How significant is this evidence against equal probabilities?
A suburban hotel derives its gross income from its hotel and restaurant operations. The owners are interested in the relationship between the number of rooms occupied on a nightly basis and the revenue per day in the restaurant.
Benz-Merc Cars produces four classes of cars: subcompact, compact, intermediate and luxury. BM also produces trucks and vans. Vendor capacities limit total production capacity to at most 1.2 million vehicles per year.
Which of the given properties doesn't apply to theoretical normal distribution?
From these statistics she calculates a 90% confidence interval of [20.9 grams, 25.1 grams]. What can the researcher do to decrease the width of the confidence interval?
What standard deviation (within 0.001 inch) minimizes the annual cost of producuign elevator rails. You do not need to try standard deviations in excess of 0.02 inches.
If the probability of no accidents during a 24 hour period is 0.1353, what is the mean number of accidents per 24 hour period?
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