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The amount of time (in minutes) devuted to commercials on a TV channel during any half-hour program is a random variable whose mean is 6.6 minutes and whose standard deviation is .866 minutes. If 40
The weight of food packed in certain containers is a random variable with a mean of 16 oz. and a standard deviation of .6 oz. If 36 packages are randomly selected, find the probability that the mean
The standard deviation of a normal random variable is 20. If a sample of 225 is selected out of a large population, what is the standard error of the mean? Round to 3 decimal places.
Scores on the Critical Reading Part of the SAT exam in a recent year were roughly Normal with mean 501 and standard deviation 112. you choose an SRS of 100 Students and average their SAT crigical re
The central limit theorem says that when a simple sample of size n is drawn from any population with mean and standard deviation, then when n is sufficiently large
A quality engineer knows from past data that in a shipment lot, the number of wire cables that have tensile strengths below the lower specification limit follows a Poisson distribution with a mean o
Dole Pineapple Inc. is concerned that the 16 ounce can of sliced pineapple is being overfilled. The quality control department took a random sample of 50 cans and found that the arithmetic mean was
The body mass index (BMI) of an individual is one measure that is used to judge whether an individual is overweight or not. A BMI between 20 and 25 indicates that one is at a normal weight.
A similar one-week study with Mountain Communications showed the Internet to be available on 352 of 400 trials. At the .01 significance level, is there a difference in the percent of time that acces
There are 10 Swedes and 7 Finns. We should choose a committee that consists of 9 people. The committee has a chairman and a vice-chairman, which should be from different nations. Moreover, apart fro
A researcher is interested in the relationship between birth order and personality. A sample of n=100 people is obtained, all of whom grew up in families as one of three children.
Please illustrate positive correlation, negative correlation, and zero correlation with scatter plots.
Using a binomial table, find the binomial probabilities p(x) associated with given n, ratio, and x. a. n=6, ratio = 0.10, p(4) b. n=10, ratio =0.7, p(7) c. n=20, ratio = 0.4, p(3) d. n=8, ratio =0.9
According to most estimates, 10% of the people in the general population are left-handed and 90% are right-handed. A neurological theory of handedness and cerebral dominance predicts that there shou
What does bivariate normal distribution mean? Explain in words or illustrate with a figure.
What is the coefficient of determination? If an r=0.8, what is the coefficient of determination?
In 1988 the mean expenses for college were $8000 with a standard deviation of $800. If 40 students were selected at random, what is the probability that the mean expenditure for this sample would be
You sample 254 students. What is the standard deviation of sampling distribution of their average score?
For a sample of 45 shipment lots, what is the probability that the sample mean for the number of wire cables with tensile strengths below the lower specification limit exceeds 53?