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At a computer manufacturing company, the actual size of computer chips is normally distributed with a mean of 1 centimeter and a standard deviation of 0.2 centimeter. A random sample of 16 computer chips is taken. What is the standard error for the sample mean?
Assuming XA ~ N(200, 202) and XB ~ N(100, 402). Find the following: Compute P90A value for fields A defined as P[XA > P90A] = 0.9
Assuming that the standard deviation and the normal shape are unchanged, to what level must the mean reduce so that 20 gallons per week is the third quartile rather than the mean?
Draw the complete decision tree and determine whether the product should be launched or not.
At the .05 significance level, can we conclude that the guideline is still reasonable?
Determine the sample size for the estimate of µ for the following. E=2.6, s=13.10, confidence level=99%.
A coin-operated coffee vending machine dispenses, on the average, 6 oz of coffee per cup. Can this statement be true of a vending machine that occasionally dispenses only enough to fill the cup half full (say, 4 oz)?
Define random variables X and Y as follows: X(H) = 1, X(T) = 2, Y(H) = 2, Y(T)=1. Find CDF's of X and Y.Are X and Y equal in distribution? What is P(X=Y)?
In a class where the exam averages are normally distributed the mean score us 75 and the standard deviation is 15. If you want to find out the probability
Facebook reports that 70% of their users are from outside the United States and that 50% of their users log on to Facebook every day. Suppose that 20% of their users are United States users who log on every day.
The researcher found that Abraham Lincoln's educational score did not correlate highly with the expected variable. What is wrong?
Easy-Fly Airline took a random sample of 25 flights to determine if the mean time it takes for luggage to reach the travelers departing from a flight is less than 15 minutes. The sample mean was found to be 13.8 minutes with a standard deviation o..
Construct a 95?% confidence interval for the population proportion of nonprofits that indicate turnover as the biggest employment challenge
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