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A law enforcement agency, administering breathalyzer tests to a sample of drivers stopped at a New Year's Eve roadblock, measured the following blood alcohol levels for the 25 drivers who were stopped:
a. Calculate the mean and standard deviation for this sample.
b. Use Chebyshev's theorem to determine the minimum percentage of observations that should fall within k = 1.50 standard deviation units of the mean. Do the sample results support the theorem?
c. Calculate the coefficient of variation for these data.
Let's say I have a new drug that I think helps diabetics. So I perform clinical trials in accordance with the FDA requirements. I give one randomly selected groups of diabetics the drug, and another sample gets a placebo pill.
What results in your departments seem to be correlated or related to other activities? How could you verify this? Create a null and alternate hypothesis for one of these issues. What are the managerial implications of a correlation between these v..
The sample proportion and the sample standard deviation are all unbiased estimators of the corresponding population parameters - variance of the standard normal distribution
If Molly and Kathleen wishes to make a profit of $5,000 for summer, how many pupils do they require to enrol?
Does this sample suggest that women shoppers in Tampa differ from the preferences expressed in the U.S. Shopper Data-base? What is your conclusion based on both the p-value and critical-value approaches? Use α = .01.
construct a 90% confidence interval for the true mean weight. what sample size would be necessary to estimate the true weight with an error +/- 0.03 grams with 90% confidence?
Jointsoft is a great over-the-counter arthritis medication, but who will ever know about it? Unfortunately, many people with arthritis tend to be elderly and rather immobile, so advertisers of arthritis medications face limitations in ways to get ..
How many data points can she use in a regression analysis using the data provided.
Find out whether palliative care improves the mental health of people with advanced HIV.
a random sample of 12 lunch orders at noodles and company showed a mean bill of 12.99 with a standard deviation of 4.6.
(a) Show that if T has an exponential distribution, the failure rate is constant. (b) Show that if T has a Weibull distribution, the failure rate is given by αβt β-1.
a what is the probability that two is the lowest number thrown?b what is the probability that five is the highest
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