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An investor has invested in nine different investments.The dollar returns on the different Investments are probabilistically independent, and each return follows a normal distribution with mean $50,000 and standard deviation $10,000.
a. There is a 1% chance that the total return on the nine investments is less than what value?
b. What is the probability that the investor's total return is between $400,000 and $520,000?
Students need a score of 60 points to pass the exam. What is the probability that a randomly selected student will pas the exam? (P(X ≥ 60))
Individual loss amounts (ground up) this year follow an inverse Weibull distribution with τ= 3 and expected value 1000. Next year you con?fidently expect loss amounts to in?ate by 10% uniformly across the board.
A sample of 10 observations is selected from a normal population for which the population standard deviation is known to be 4. The sample mean is 23. (Round your answers to 3 decimal places.) (a) The standard error of the mean is_____?
a company manufactures a batteries in batches of 20 and there is a 3 rate of defects find the mean and standard
a sample of 65 night-school students ages is obtained in order to estimate the mean age of night-school students. x
A pharmaceutical company has determined that if a new cholesterol-reducing drug is manufactured (introduced to the market) the following probability distribution will describe this drug's contribution to the company profits during the next six mon..
Look at the shape of the binomial distribution for various combinations of n and p. Speci?cally, 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 affec..
One objective of this course is learning how to correctly interpret statistical measures.
an investigator wants to test if there is a difference in endotoxin levels in children who are exposed to endotoxin as
A survey of 800 women shoppers found that 17% of them shop on impulse. What is the 98% confidence interval for the true proportion of women shoppers who shop on impulse?
Our analysis table gives a p-value of 0.01 for Pressure -- all other effects have large pvalues -- larger than 0.25. What does this all mean?
Calculate the appropriate test statistic (i.e., z-test, t-test) using the descriptive statistics below. Note: you should check your work using the SPSS printout below. If your answer does not match either you 1) made a mistake in your calculations..
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