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An olympic archer is able to hit bull's-eye 80% of the time. assume each shot is independent of the others. if she shoots 6 arrows, what's the probability of each of these results?
she gets at least 4 bull's-eyes?she gets at most 4 bull's-eyes?how many bull's-eyes do you expect her to get?with what standard deviation?if she keeps shooting arrows until she hits the bull's-eye, how long do you expect it will take?
How would you explain to another student the difference between compound interest and continuous compound interest to a friend?
Describe the distribution of sample means (shape, expected value, and standard error) for samples of n=36 selected from a population with a mean of µ=100 and a standard deviation of σ=12.
Compute β-error of test in part (a) if true difference in mean burning rate is 2.5 centimeters per second.
Flaws in a certain type of drapery material appear on the average of one in 150 square feet. If we assume the Poisson distribution, give the probability of at most one flaw in 225 square feet.
According to state government, the monthly incomes of college graduates have a standard deviation of $650. A county official believes that the standard deviation of monthly incomes is higher in her county.
Assume that a random variable, x, is distributed according to a normal distribution with mean 12 and standard deviation 2. Find the z-value if:
The U.S. government recently reported that the proportion of people feeling negative about the economy was only 30%. However, a recent poll by CNN/Gallup found that in a sample of 1000 people 450 of them felt negative about the economy.
To do this, he selects 16 bags of tortilla chips of this brand at random and determines the net weight of each. He finds a sample mean of 13.88 oz. with a standard deviation of s = 0.24 oz.
What percent of healthy young adults has osteoporosis by the WHO criterion? Suppose that the standard deviation is the same as for young adults. What percent of this older population has osteoporosis?
Could rejecting the null hypothesis actually be a positive thing in an experiment or test? Please provide and example with your thoughts. Could you think of a situation where rejecting the null hypothesis does not mean the alternative hypothesis is ..
Find the 90% confidence interval for the mean, variance, and standard deviation for the price in dollars of an adult single-day ski lift ticket.
Find the mean and standard deviation for the numbers of boys in groups of 51. b) Is the result of 39 boys unusual? Does it suggest that the gender-selection method appears to be effective?
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