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The life of a semiconductor laser at a constant power is normally distributed with a mean of 7000 hours and a standard deviation of 600 hours.
(a) What is the probability that a laser fails before 5,800 hours?
(b) What is the life in hours that 90% of the lasers exceed?
Major hurricane will strike the U.S. mainland, b) at most one major hurricane will strike the U.S. mainland, and c) more than one major hurricane will strike the U.S. mainland.
Use the following information to tfind the P-value
The borderline between low calcium levels and those not considered low. Carry your intermediate computations to at least four decimal places. Round your answer to at least one decimal place.
At the .10 significance level you will test to determine if there has been an increase in selling time. What is your decision?
The specification that true average penetration be at most 50 mils. They will be used unless it can be demonstrated conclusively that the specification has not been met. What would you conclude?
Find the value of sample covariance in linear regression model
question the associated press reports that the mean trading volume for equity and index options contracts was 3.6
What is the relationship between the sign of the correlation coefficient and the sign of the slope of the regression line?
A doctor believes that the standard deviation of systolic blood pressure is 450. A random sample of 24 patients found a standard deviation of 520. Assume the variable is normally distributed and a = 0.01. What are the critical values?
How much error, on average, would you expect between the sample mean (M) and the population mean for: a sample of n=4 scores, a sample of n=16 scores, and a sample of n=25 scores.
2. we saw in class that a coin-flipping game that pays 2n if the first head appears on the nth that is a random
Construct a 90 percent confidence interval for the proportion of all kernels that would not pop. (b) Check the normality assumption. (c) Try the Very Quick Rule.
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