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Question: Tweet, tweet! What proportion of students at your school use Twitter? To find out, you survey a simple random sample of students from the school roster.
(a) Will your sample result be exactly the same as the true population proportion? Explain.
(b) Which would be more likely to get your sample result closer to the true population value: an SRS of 50 students or an SRS of 100 students? Explain.
(a) What is the 90% confidence interval estimate for the true mean monthly wages paid to farm workers? (b) What is the 99% confidence interval estimate for the true mean monthly wages paid to farm workers? (c) Compare and comment on the results of (a..
Steve Goodman, production foreman for the Florida Gold Fruit Company, estimates that the average sale of oranges is 4,700 and the standard deviation is 500 oranges. Sales follow a normal distribution.
What is the difference between hypothesis and theory? If there is a difference between the two, what comes first - hypothesis or theory?
Let s classify the eruptions as long or short, depending upon whether or not they last at least 3 minutes. Describe what you see in the comparative boxplots.
A diet is being developed which must contain at least 100 mg of vitamin C. Two fruits are used in this diet. Bananas contain 30 mg of vitamin C and Apples contain 20 mg of vitamin C. The diet must contain at least 100 mg of vitamin C. Which of the..
Discuss the properties of a normal distribution. Why are there infinite possible normal distributions? Why should one assume that sample data represents a population distribution?
what are the three most important things you learned about sampling? write 5 sentences
A study was conducted to estimate the mean amount spent on birthday gifts for a typical family having two children. A sample of 195 was taken, and the mean amount spent was $210.97.
A certain poultry farmer finds that 8% of his eggs are underweight and that 12% weigh over 70 grams. Estimate the mean and standard deviation of his eggs.
The McNemar test is a test on a 2x2 classification table when you want to test the difference between paired proportions. Chi-square test for 2X2 tables compares the tallies or counts of categorical responses between two (or more) independent grou..
Simulate both one-and two-teller systems, calculate waiting time, average queue length, and percentage utilization for each system.
How is the rejection region defined and how is that related to the z-score and the p value? When do you reject or fail to reject the null hypothesis?
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