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A sample of 1500 men, ages 18-64, was randomly chosen from the population of a large metropolitan area. The researcher wanted to investigate the influence of diet, specifically the role of saturated fat in the diet, on the development of a myocardial infarction (heart attack).
Myocardial InfarctionStimulus Variable Yes No TotalHigh Saturated Fat Diet ( >30% of daily calories from saturated fat) 600 100 700Low Saturated Fat Diet (<30% of daily calories from saturated fat) 100 700 800Total 700 800 1500
1. What is the sample and population in this study?
2. What are the variables in this study?
Multiple choice question using Forecasting techniques. Which among of the following models are best suited to forecast a time series with a stable seasonality component.
Explain the difference between testing a single mean, testing the difference between two means from an "independent sample" and testing mean differences from a "dependent sample".
Does lovastatin reduce the risk of heart attack? Researchers gave lovastatin to 2,325 people and an placebo to 2,081 people. the average age of both groups in 58 years.
Estimated sales resulting from a $15,000 investment in inventory and an advertising budget of $10,000. Interpret b1 and b2 in this estimated regression equation.
The average height of american woman is distributed normally, with a mean of 63.5 inches and a standard deviation 2.5 inches. Approximately what percentage of american women are taller than 58.5 inches,
Write the hypothesis statement. What distribution are you using?
The booked passengers actually arrive for the flight. Estimate the probability that if the company books 278 persons. not enough seats will be available.
In a sample of 88 children selected randomly from one town, it is found that 8 of them suffer from asthma. Find the P value for a test of the claim that the proportion of all children in the town who suffer from asthma is equal to 11%.
If a simple random sample of 80 seniors is taken, what is the probability that at most 64 of them will be accepted into college.
Use drinking as an excuse for outrageous behavior. including public nudity and dancing on tables. Find the standard error of this estimate. and interpret.
A recent study of 50 self-service gasoline stations in the Greater Cincinnati' Northern Kentucky metropolitan area revealed that the mean price of unleaded gas was $2.029 per gallon. The sample standard deviation was $0.03 per gallon.
One sample has a variance of s2=6 and a second sample has a variance of s2=8. If the two samples are the same size (n1=n2), then what is the pooled variance for the two samples?
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