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A study of internet usage indicated a month average of 36 internet sessions per user from home. A random sample of 24 teenages yielded a mean of 42.1 sessions with a standard deviation of 5.3. (a=.
Suppose he attempts 20 3-point goals for the first 4 games of next year. What is the mean number of shots that he will make? What is the standard deviation in te number of shots he will make? What i
Determine the correlation coefficient, the t-value and p-value for a linear regression t-test. State the null hypothesis, accept or reject, summarize the results.
Do an appropriate hypothesis test to determine the proportions of colors differ from the general population. State the null hypothesis and accept or reject. Summarize the rsults.
Find the variance and standard deviation of this data set: 20, 29, 25, 25, 22, 11, 16, 24 (show work)
If X has a normal probability distribution what is the population mean and standard deviation. How musch would the estimate need to be changed so that there is a 50% chance of an overrun.
Suppose according to a 1990 demographic report the average U.S. household spends $90 per day. Suppose you recently took a sample of 30 households in Huntsille and the results revealed a mean of $84.
The average magnesium concentration in ground water around Metro City is u=65.6 parts per million(ppm) with a standard deviation of o=10. The table below shows the ground-water magnesium concentrati
Breaking strength (in kg) of the front part of a new vehicle is normally distributed. In 10 trials the breaking strengths were found to be 578, 572, 570, 568, 572, 570, 570, 572, 596, 584. Find a 95
Lengths of pins (in mm) produced by a machine follow a N (mu, sigma 2) distribution. Find the maximum likelihood estimators of mu and sigma 2 based on a random sample of size 10 with observations:
The combined weights of passengers and their luggage (in kg) are uniformly distributed on the interval (a, b). The weights observed for a random sample of 9 passengers were: 90, 135, 120, 127, 115,
Assuming that intakes at different meals arc independent of one another, what is the approximate probability that the average calorie intake per day over the next year (365 days) is at most 3410?
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