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A physical fitness asociation is including the mile run in its secondary -school fitness test .The time for this event for boys in secondary is known to posses a normal distribution with a mean of 450 seconds and a standard deviation of 50 seconds .Find the probability that a randomly selected boy in secondary school can run the mile in less than 335 seconds.
When trying to understand the stroke data, what would be the advantage of looking at a histogram instead of this frequency distribution?
Her results (in hours until turning a particular shade of brown) are in the table below. At ∞= .01, did she see a difference between the two treatments?
A college believes that 28% of applicants to that school have parents who have remarried. How large a sample is needed to estimate the true proportion of students who have parents who have remarried to within 5 percentage points with 95% confidenc..
Each patient also submits the blood sample and their glucose tolerance status is determined. Determine the sensitivity of screening test?
Let X1 and X2 denote the proportion of two different chemicals found in a sample mixture of chemicals and used as an insecticide. Suppose X1 and X2 have the joint probability density function given by:
When a fisherman catches a fish, it is a young one with a probability of 0.23 and is returned to the water. On the other hand, an adult fish is kept to be eaten later.
The scores of college-bound senior men on the math part of the SAT followed a normal distribution with mean 527 and standard deviation 116.
If probability of getting sample mean x less than unreported sample mean is 0.025, determine value of the unreported sample mean?
A random sample of 20 single men was asked if they would welcome a woman taking the initiative in asking for a date. What is the probability that:
A pollster calls 500 randomly selected people and all 500 respond to her first question. Because the subjects agreed to respond, is the sample a voluntary response sample?
Suppose a sample of 35 surveys shows a sample mean of 17 minutes. Use = 4 minutes. Is the premium rate justified? Formulate the null and alternative hypotheses for this application.
Explain these results to a person who understands the t test for a single sample but knows nothing about the t test for independent means.
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