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Consider a population that consists of 600 lives aged 50 and 520 lives aged 60. Probability: one aged 50 lives to 80 p=0.43732 probability: one aged 60 lives to 80 p=0.47806 and all lives have independent future lifetime random variables.
Calculate the standard deviation of the total number of survivors to age 80.
In a BMT class test the scores of 8 students are: 11; 10; 6; 3; 11; 10; 9; 11. Assume the sores are a simple random sample from a normally distributed population. What is the point estimate of the standard deviation?
Find the mean, median, range and standard deviation for the 2005 returns and estimate with 99% confidence the average order in the city.
a doctor is trying to determine whether her patients prefer a male nurse or a female nurse. after asking 25 male
Construct a confidence interval for a level of confidence equal to 95%, we use z values that leave out, in the lower and the upper tails of the normal distribution, an area equal to?
Below is a normal plot of residuals from a regression. Does the plot indicate any problems with the assumption that the residuals are Normally distributed
Superior Medical System's 2005 balance sheet showed total common equity of $2,050,000. The company had 100,000 shares of stock outstanding which sold at a price of $57.25 per share.
Determine which groups differ in average shelf life. Give test statistic, hypothesis, decision rule and hypothesis
It is estimated that 2% of the athletes competing in a large tournament are users of an illegal drug to enhance performance. The test for this drug is 95% accurate. What is the probability that an athlete who tests positive is actually a user?
an anatomy teacher hypothesizes that the final grades in her class are distributed as 10 as 23 bs 45 cs 14 ds and 8 fs.
consider that the population is normally distributed construct a 95 confidence interval estimate for the population
You find that a random sample of five microwave ovens has a mean repair cost of $75 and a standard deviation of $12.50. At α = 0.01, do you have enough evidence to support the repairer's claim?
test the claim that the population of earthquakes has a mean magnitude greater than 1.00. use a 0.01 significance level
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