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Accidents at a chemical plant occur at a rate of 1.9 per month. Find: The expected number of accidents in a year? The probability of no accidents next month? The probability of fewer than three accidents next month?
Find out the range (R), variance (V) and standard deviation (s) for the given set of values:
Construct a 99% confidence interval for the difference between the true average boot times of the two types of hard drives. Assume the difference will represent (HDD-SSD) and that the population standard deviations are statistically the same.
Now suppose that a finished product is randomly selected. What is the probability that it is defective?
The sample mean is 50, the t-critical value is 1.96, and the standard error of the sample mean is 2.
Correlation based on Scatter Plot - Draw the scatter plot for the variables.
Researchers at the Brigham & Women's Hospital recruited 2,000 participants to study the relation between diet and cholesterol.
Find out whether this is enough evidence to accept or reject manager's null hypothesis, using alpha = .01. Is this test left-tailed, right-tailed or two-tailed?
A survey of 600 non-fatal accidents showed that 111 involved the use of a cell phone. Find a point estimate for p, the population proportion of accidents that involved the use of a cell phone.
We assume that the population is approximately normally distributed. Find the confidence interval: for a confidence level of 95%:
In a pilot study, five kids are given several problems of each type to practice (and then tested on three problems), in one of the three Sequences: D-R-T, T-D-R, OR R-T-D.
Determine a 99% confidence interval for mean pH in rainfall. How would you distinguish interval?
For the most recent year available, the mean annual cost to attend a private university in the United States was $20,182. Assume the distribution of annual costs follows the normal probability distribution and the standard deviation is $4,400.
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