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A meat processing plant has processed an average of 100 tons per day for the last several years. Newer processing machines have been installed recently. The quality control manager would like to know whether this average has improved. She randomly selects 40 days from the computer database and computes the average and standard deviation of n = 40 days to be 105 tons and 8 tons, respectively. Is this an experiment or an observational study and why?
What are the main differences between descriptive and inferential statistics? Give examples of each. When would random sampling not be the best approach to sample selection? Give an example.
Assume that the distribution of heights of adults American normally distributed, with mean 69 inches and standard deviation 2.8 inches.
Determine estimated average starting salary for school with average GMAT of 600 points?
The password of 52 digit sequence is made. It consists of 0 and 1. How various different possibilities exist for networks password.
No estimate of the population proportion is available. How large a sample is required?
First explain what the Gini coefficient is and what hypothetical Gini values of 0 and 1 mean. Sort the data by the Gini coefficient in 2000 and look at the list of countries.
A company is producing cylindrical blocks for a children's toy. The average diameter of a block is 3.5 inches. Sixteen blocks are inspected and the diameters are measured.
What does null hypothesis for repeated-measures hypothesis test state?
You listen to radio station for 1 hour, at arbitrarily selected time, and carefully observe that amount of advertising time is equal to 7 minutes. Compute z-score for this amount of advertising time.
To maximize Andre's probability of landing on the net, how far away from the cannon should he position the nearest edge of the net?
Research question: Are mean crash damages same for these 3 vehicles? Crash1 Crash Damage ($).
At the .01 significance level can we conclude the mean age is more than 8.4 years for the cars of university students? Compute the value of the test statistic.
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