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In a test for effectiveness of garlic for lowering cholesterol, 47 subjects were treated with Garlicin. Cholesterol levels were measured before and after the treatment. The changes in their levels of LDL, cholesterol (in mg/dL) have a mean of 5.5 and standard deviation of of 15.7
Construct a 95% confidence interval estimate of the mean net change of LDL, cholesterol after the Garlicin treatment.
the level of nitrogen oxides nox in the exhaust of cars of a particular model varies normally with mean 0.25 grams per
Compute the 95% confidence interval on the population mean if a sample of 1000 is taken and the sample mean is found to be 15.95 and standard deviation is 4.2.
State the appropriate null and alternative hypothesis for the following case: The examinations in a large freshmen chemistry class are scaled after grading.
Find out the crude death rate, age specific death rate, standard death rate and adjusted death rate.
a professor gives tests that are either hard medium or easy. if she gives a hard test her next test will be either
A Pool Supply sells all types of billiard equipment, and is considering manufacturing their own brand of pool cues. Mysti Farris, the production manager, is currently investigating the production of a standard house pool cue that should be very po..
A poll found that 329 out of 763 adults said they would travel to outer space in their lifetime, given the chance. Estimate the true proportion of adults who would like to travel to outer space with 92% confidence.
Using hypergeometric distribution, determine the probability that the sample of 6 will comprise 2 nonconforming watches?
1 a random sample of 60 college graduates results in a mean time to graduate of 4.58 years with a standard deviation of
Time spent using e-mail per session is normally distributed, with μ = 8 minutes, and σ = 2 minutes. If you select a random sample of 25 sessions,
The standard deviation of the sample is 5. find the best point estimate of the mean. find the 95% condidence interval of the mean score for all golfers.
Test whether the music reduces studying capacity at a .05 level of significance.
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