Probability of calculating a sample proportion
Mars states that the population proportion of blue M&Ms is .240. When approximating the binomial distribution as NORMAL, what is the probability of calculating a sample proportion of .237 or less blue M&Ms from a sample size of n = 70?
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Based on the certain data, a null hypothesis is rejected at the 0.05 level of significance. would it also be rejected at the
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Data with 250 observations are drawn from a bell-shaped distribution with a mean of 50 and a standard deviation of 12. Approximately how many observations are more than 74?
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The average length of stay at a local hospital is 4.9 days. Assuming a population standard deviation of 3.5 days, what is the probability a random sample of 50 patients has an average stay of 5.2 days or less?
In an application to estimate the mean number of miles that employees commute to work roundtrip each day, the following information is given: n = 20; sample mean = 4.33; sample standard deviation of s = 3.50 miles.
Suppose you want to estimate the population proportion of statistics nerds at college. To do so, you take a sample of 100 students and find that 20 of those students were bona-fide, genuine statistics nerds. What is the lower limit of the 90% conf
A large city claims that it provides "free lunch" to more than 30% of its elementary school students. A researcher selects a random sample of 200 students and finds that 72 were getting free lunches. Does the evidence supports the claim at ? = 0.0
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