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A random variable x has mean mu and standard deviation sigma. Suppose n independent observations of x are taken and the average xbar of these n observations is computed.
Which of the following best describes what the "95% confidence" means in a 95% confidence interval for mu of (10, 20)?
Given X~N(0,2) where ?=2, what is the 25th percentile of this distribution?
Suppose that the distribution of keyboarding speeds for students who have completed a two- week keyboarding course is approximately normal with a mean of 82 words per minute (wpm) and standard devia
An MP3 player is loaded with 60 musical selections: 24 rock tunes, 21 jazz tunes, and 15 blues tunes. The player is set on "random play", so selections are played randomly and can be repeated (selec
Jack's game preserve is stocked with 30% moose, 25% elk, and 45% deer. Five years later, a sample of animals yields 90 moose, 75 elk, and 170 deer. At the 5% level, did the distribution of animals i
In a states pick 3 lottery game you pay 1.42 to select a sequence of three digits (from 0 to 9) such as 411. if you select the same sequence of three digits that are drawn you win and collect $439.1
Which of the following is not a requirement for regression analysis?
Almost all of the acidity of soda pop comes from the phosphoric acid which is added to give them a sharper flavor. The correlation between acidity and phosphoric acid is -0.991. Use this correlation
Suppose that A and B are events defined on a common sample space and that the following probabilities are known. Find P(A or B). (Give your answer correct to two decimal places.) P(A) = 0.35, P(B) =
A random sample of records of electricity usage of homes gives the amount of electricity used in July and size (in square feet) of 135 homes. A regression was done to predict the amount of electrici
What are the null and alternative hypotheses? What is the P-value? Reject or do not reject null hypothesis?
Listed below are measured amounts of lead in the air. The EPA has established an air quality standard for lead of 1.5 mg/m3. The measurements shown below were recorded at a building on different day
In the annual report, a major food chain stated that the distribution of daily sales at its Detroit stores is known to be bell-shaped, and that 95 percent of all daily sales fell between $19,200 an
It is estimated that 10% of the athletes competing in a large tournament are users of an illegal drug to enhance performance. The test for this drug is 90% accurate. Use a decision tree to determin
On a psychology exam with m = 76 and s = 12, Tom scored 9 points below the mean, Mary had a score of X = 70, and Bill had a z-score of z = -1.00. Place these three students in order from lowest to h
You are permitted to draw two marbles from an urn. you do so and the result is two black marbles. what is the probablity that the urn you drew from is that with no blue marbles.
Your name and that of a friend is included in a raffle drawing. For the raffle, two tickets will be drawn, and those whose names are on the tickets win a prize. Compute the following probabilities.
What is the linear correlation coefficient between square footage and asking price? r=?
Does his data suggest that insurance type and number of doctor's visits per year are related, using a 0.05 level of significance? Show your work.
Suppose random poll of 632 likely voters in Alabama found that 373 feel that daylight savings time should be abolished. What is a 90% confidence interval for the percentage of voters in Alabama who
In a sample of 270 households in a certian citym 210 had high speed internet access. can you conclude that more than 70% of the households in this city have high speed internet acces? round p to fo
In 2008, the per capita consumption in Country A was reported to be 8.3 kh or 18.23 pounds. Assume that the per capita consumption of coffee in Country A is approximately distrubited as a normal ran