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In a factory the time it takes to assemble given equipment varies from worker to worker, but it is known that the distribution of assembly time is normal with the mean of 100 minutes and with the standard deviation of 10 minutes.
The old management gave a bonus to the workers whose assembly time was at most 85 minutes. What proportion of workers got the bonus?
Do I do (85-100)/10=-1.5 so the p-value is 0.0668
Is that the answer?
A certain statistics author's golf scores follow the normal distribution with a mean of 92 and a standard deviation of 4. What is the probability that, during his next round of golf, his score will be ...
Problem: A student was asked to find a 99% confidence interval for the proportion of students who take notes using data from a random sample of size n = 88. Which of the following is a correct interpretation of the interval 0.13
a. Use the Hildreth-Lu procedure to obtain a point estimate of the autocorrelation parameter. Do a search at the values p = .1, .2, ... , 1.0 and select from these the value of p that minimizes SSE.
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Suppose that lifetimes of light bulbs produced by a certain company are normal random variables with mean 1000 hours and standard deviation 100 hours
What are the expected mean and standard deviation for your sample, assuming the distributor's claim is true? (Show your work)
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Find and interpret a 95% confidence interval for the mean amount stolen. Find and interpret a 95% confidence interval for the mean number of bank staff present at the time of robberies.
The publisher of popular financial periodical has decided to undertake a campaign in an effort to attract new subscribers.
Conduct a one-tailed test aimed at proving that the percentage of popular recommendation of physicians is larger in small towns than in large metropolitan.
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