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A collection of all the test scores for a standardized, post-secondary examination administered in the 1970's across countries along the West African coast, is well-modeled as a random variable X ∼ N (μ, σ2) with μ = 270 and σ = 26. If a score of 300 or higher is required for a "pass- with-distinction" grade, and a score between 260 and 300 is required for a "merit-pass" grade, what percentage of students will receive the "distinction" grade and what percentage will receive the "merit" grade?
The standard deviaiton is 2 pounds. If 15% of the suitcases are overweight, find the maximum weight allowed by the airline. Assume the variable is normally distributed.
a company decides to add a new program that prepares randomly selected sales personnel to increase their number of
Formulate the null and alternative hypothesis to test the claim that one-litre cartons of milk are being underfilled. Conduct a hypothesis test for a single mean using α = 0.05.
The the steps of hypothesis testing b) sketch the distribution involved, and c) explain your answer to someone who is familiar with the t test for a single sample but not with the t sest for independent means.
In order to study any possible relationship between age and change in systolic blood pressure (BP) (mm Hg) in 24 hours in response to a treatment, the following data were obtained from 11 individuals.
suppose you have a coin that lands on heads with probability p 0 lt p lt 1. you dont know the value of p however. so
A survey of 500 non-fatal accidents showed that 226 involved the use of a cell phone. Construct a 99% confidence interval for the proportion of fatal accidents that involved the use of a cell phone.
Locate the results of a recent survey in a newspaper, magazine, or Internet article. Outline the survey data so that your peers can understand the variables and results, and then identify at least one key formula from this Module that you could us..
suppose that two 4-sided dice are rolled that is each die has faces with numbers 1 2 3 amp 4. what is the probability
Biggio's Department Store has six employees available to assign to four departments in the store: home furnishings, china, appliances, and jewelry.
the diameters of a new species of apple have a bell-shaped distribution with a mean of 7.26cm and a standard deviation
Is there evidence that the growth hormone increases the milk production?
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