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Look at the shape of the binomial distribution for various combinations of n and p.
Specifically, let n = 5 and try p = 0.2, 0.5, and 0.8. Repeat the same for other values of n. Can you say something about how the skewness of the distribution is affected by p and n?
you are dealt a hand of three cards from a standard deck of cards one at a time. what is the probability that the first
A ten year old survey found that the average income of sole proprietor CPA's was $74,914. To update this information, a new survey of 112 proprietor CPA's was taken and it showed a mean of $74,695.
The standard hemoglobin reading for normal males of adult age is 15 g/100 ml. The standard deviation is about 2.5 g/100 ml. For a group of 36 male con- struction workers, the sample mean was 16 g/100 ml. Construct a 95% confidence interval fo..
Trophies are awarded to the two persons receiving the highest and second-highest number of votes. In how many different ways can the trophies be awarded?
suppose the participants for jury duty are picked from a large pool of county residents with equal numbers of men and
We wish to construct a 90% confidence interval on the mean of a population known to be normally distributed based on a sample of 20 observations having a sample mean of 8 and a sample standard deviation of 2. What is the standard error?
What is the probability that tomorrow's return on your investment in ABC is somewhere between -1% and +.5%?
Taking care to control for weather conditions and other variables as much as possible. Define the null hypothesis.
The mean lifetime was 3.2 hours with a standard deviation of 0.1 hours. The lifetimes are approximately bell-shaped. Estimate the number of batteries with lifetimes between 3.0 hours and 3.4 hours.
After every score in a sample has been multiplied by 4, the mean is found to be M =48 and the standard deviation is s =12. What were the values for the mean and standard deviation for the original sample?
Cheap-As-Dirt Rental Company advertises that the average cost of a rental they find forundergraduate students at the University of Oregon is $540 with a standard deviation of$75 (Let us assume the rents are approximately Normally distributed.) The..
A marble is selected at random from a jar containing 6 red marbles, 5 yellow marbles, and 4 green marbles. What is the probability that the marble is red
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