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1. A random sample of 26 offshore oil workers took part in a simulated escape exercise, and their times (sec) to complete the escape are recorded. The sample mean is 370.69 sec and the sample standard deviation is 24.36 sec. Construct a 95% confidence interval on the true average escape time. Interpret your interval.
2. A study is to be conducted on the proportion of homeowners who own at least two TV sets. How large a sample is required if we wish to be 90% confident that the error in estimating this quantity is within 1.5%?
3. An investigator wishes to estimate the difference between population mean SAT-M scores of incoming freshmen in the College of Engineering and in the College of Science at Purdue University. The population standard deviations are both roughly 100 points and equal sample sizes are to be selected. What value of the common sample size n will be necessary to estimate the difference to within 10 points with 99% confidence?
The average value observed was 1.2 mg. If the sample variance is 0.04 mg, compute a 99% confidence interval for the mean nicotine content.
Compare and contrast internal and external validity. Describe and give examples of research questions for which external validity is a primary concern.
Why is "rounding-down" the LP solution the suboptimal way to solve Integer programming problems? Can you describe why?
discuss the implications of magnitude from 0 to 1 sign or - and probability versus causality for the correlation
The MacBurger restaurant chain claims that the waiting time of customers for service is normally distributed,
Critically the difference between Paramaeter and Statistics and Critically discuss the concept of operationalize? What are focus groups
One school found that 28.6% of all students are liberal. You wonder whether this percentage is different at your school, but don't know whether it's higher or lower. What hypotheses will you test to see if your school significantly differs from th..
A random sample of 900 workers in a particular city found 342 workers who had full health insurance coverage. Find a 95% confidence interval for the true percent of workers in this city who have full health insurance coverage.
Construction of frequency distribution table for the given continuous data.
a mean guy gave you a nice sample from normal distribution with known variance. so the test should be easy. but he
Calculate the mean, median, and standard deviation for ounces in the bottles and construct a 95% Confidence Interval for the ounces in the bottles.
1.a newspaper conducted a statewide survey concerning the 2000 race for state senator. the newspaper took a random
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