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Prove that if X1 and X2 are jointly normally distributed random variables whose correlation coefficient vanishes then X1 and X2 are independent.
Adults is approximately normal with a mean of 191 lbs. and a standard deviation of 20 lbs. Using the 68-95-99.7 rule. What percent of males weigh more than 211 lbs?
Calculate the mean and standard deviation of the following data sets, then produce a five number summary and box plot of data.
Find an example of a randomized experiment in the news. Answer the following questions about it. Be sure to include the news article with your response.
Find an interest rate that gives a net present value of 0. The interest rate for which NPV = 0 is often called the internal rate of return.
a normal population has m 50 and s 8. a random sample of n 4 scores from this population has a mean of 54. what is
a) 95% of confidence intervals generated will include the sample mean X. b) 5% of the confidence intervals generated will include the true mean μ
Each of the following quotes is taken from an article titled, "Education seems to help in selecting husbands" (Sacramento Bee, December 4, 1998, p. A21), which reported on new data in the Statistical Abstract of the United States. Draw an appropri..
Estimate the true proportion of unemployed workers and place bounds on the error of estimation. How many persons must be sampled to reduce the bound on the error of estimation to .02?
Cash withdrawals (in multiples of $20) at an on-campus ATM for a random sample of 30 Fridays and 30 Mondays are shown below.
If Subway wanted to have 90% confidence in being within 3 percentage points of the population percentage who are pleased, how many of the new franchisees would have to be included in the sample?
Assuming that the observations come from a normal distribution with mean µ, test H0: µ = .5 against HA: µ > .5 using a level .1 test. Compute a P-value?
Determine whether each of the following variables would best be modeled as continuous or discrete.
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