Find the z scores that separate the middle
Find the z scores that separate the middle 48% of the distribution from the area in the tails of the standard normal distribution
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The mean commute time in the US seems to be increasing. The current mean is 25.1 minutes and suppose you know ? = 12. If you are testing at the 1% level of significance, Find the power to find an increase of 1.5 minutes for a sample of 200.
How many strings of ten digits length can be formed using only the digits 1,2,3,4,5? Digits may be used more than once in the same string.
Assume that the hay fever rate in each age group has an approximately normal distribution. Does the data indicate that the age group over 50 has a lower rate of hay fever? alpha is 0.05. Show formulas, H0 and H1 too.
What is the value called that separates the region of rejection from the region of non rejection?
A multiple-choice test contains n questions. If answers are randomly selected, the correct answer will be selected with probability p. What is the probability that X, the number of questions that the student answers correctly, equals x?
For Binomial distribution with n = 10 and probability of success p = 0.4 find probability of less than 3 successes (x < 3) (3 is not included).
According to an airline, a particular flight is on time 85% of the time. Suppose 13 flights are randomly selected and the number of on time flights is recorded. Use technology to find the probabilities. (a) Determine whether this is a binomial exe
To evaluate the performance of a certain brand of alkaline battery, researchers at a consumer testing laboratory measure the lifetime of 160 1.5-volt batteries.
What percentage of subway riders must re-swipe the card because they were outside the acceptable range? (Round your answer to 2 decimal places.)
The following problem should be answered in R. Any answers (partial or complete) would be greaty appreicated! Generate 50 normal distributions with mean= 15 and standard deviation= 3 with a sample size of 30 each. For each of these data sets, calcu
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