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1. If you are dealt 3 cards from a shuffled deck of 52 cards, find the probability that all 3 cards are queens.
2. A fair coin is tossed 8 times in succession. Find the probability of getting at least 4 heads.
3. A die is rolled twice. Find the probability of getting two numbers whose sum exceeds 5.
4. How many different five-letters passwords can be formed from the letters A,B,C,D,E,F,G,H,I,J,K if no repitition is allowed? And if repitition of letters is allowed?
A recent study of cardiovascular risk factors reports that 30% of adults meet the criteria of hypertension. if 15 adults are assessed, what is the probabiliy that?
A busy landscaping supplies company sells wood chips for garden mulch. The mulch is sold by the cubic metre and delivered to households in a small truck.
Given this information, what would sampling error be if sample including seven values in top row were used to calculate sample mean?
Define validity and reliability. How can we insure our data is both reliable and valid? Which of these two do you think is the more important?
If we know that the length of time it takes a college student to find out a parking spot in library parking lot follows a normal distribution with a mean of 3.5 minutes and a standard deviation of 1 minute
A final exam in Math 157 is normally distributed and has a mean of 75 with a standard deviation of 12. If 36 students are randomly selected, find the probability that the mean of their test scores is greater than 70.
A cereal manufacturer seeks to test their newest product against a competitor's. A group of 100 children was asked to evaluate each brand, and then to express a preference. To guard against bias, neither the children, nor the technicians serving t..
The lifetime (hours) of an electronic device is a random variable with the exponential probability density function:
The ELISA test for AIDS was used in the screening of blood donations in the 1990s. As with most medical diagnostic tests, the ELISA test is not infallible.
Each year approximately 160 colleges compete in national concrete canoe competion. Each team should design a seaworthy canoe from a substance not known for its capacity to float. T
Use a 0.05 significance level to test the claim that unfiltered king-size cigarettes have a mean tar content greater than that of filtered 100 mm cigarettes.
Calculate the standard error. With 95% confidence, find out the margin of error?
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