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A sample of 500 evening students revealed that their annual incomes were normally distributed with the mean income of $30,000 and standard deviation of $3,000. Determine the income which separates top 25% from lower 75% of incomes?
He surveys a sample of 40 students and finds that for the most recent semester their average cost was $430 with a standard deviation of $80. What is the test value for this hypothesis test?
Identify a research question from your professional life, research interests, or everyday experience that could be addressed by this analysis.
High precision titanium spheres are popular components in manufacturing of ball bearings. A factory has ordered a shipment of 5000 titanium spheres from aboard. It is found that the shipment has a mean radius of 1.5 cm with a standard deviation ..
2 laptops are chosen at random without replacement, what is the probability that both are high priced?
Assume that two samples are independent simple random samples selected from normally distributed populations. Use a 0.05 significance level to test the claim that male and female biology students speak the same mean number of words in a day.
Can the binomial distribution be used to model the number of rare events that occur over a given time period?
Develop a probability for the number of students in the sample who watch soap operas.
Determine relative frequency of X=4? Generate the cumulative frequencies.
You create a 95% confidence interval for your average score and it is (76.347, 79.133). Given this information, what is the best conclusion?
According to an article, 19% of the entire US population have high-speed access to the Internet. Random samples of size 200 are selected from the US population.
Determine percent of the garages take between 29 hours and 34 hours to erect? Determine percent of garages take 28.7 hours or less to erect?
According to a recent study, 38% of all women will suffer a hip fracture because of osteoporosis by the age of 85. If six women aged 85 are randomly selected, what is the probability that a) None of them will suffer (or has suffered) a hip fractur..
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