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PROBLEM 1
A laptop manufacturer finds that the average time it takes an employee to load a laptop with software is 35 minutes with a standard deviation 15 minutes. Suppose you take a random sample of 121 employees. The standard deviation of the sample mean is:
PROBLEM 2
A company that manufactures bookcases finds that the average time it takes an employee to build a bookcase is 10 hours with a standard deviation of 2 hours. A random sample of 64 employees is taken. What is the likelihood that the sample mean will be 9 hours or more?
A brokerage survey reports that 40% of all individual investors have used a discount broker (one that does not charge the full commission).
Could we use a simpler procedure that continues to ?ip the coin until the last two ?ips are different, and then sets X = 0 if the ?nal ?ip is a head, and sets X = 1 if it is a tail?
A population consists of two strata, H and L, of sizes 100,000 and 500,000 and standard deviations 20 and 12, respectively. A stratified sample of size 100.
according to the mendelian theory of inherited charateristics a cross ferilizatiopn of related species of red and white
What is the 99% confidence interval for the true proportion of all e-mail subscribers that opened the e-mail within 24 hours of receiving it?
1. consider a random experiment of tossing a coin three times.a find the sample space s1if we wish to observe the exact
Compute sample mean. Assume that desirable value for this solution has been specified to be 65.0 grams per liter. Compute sample variance and sample standard deviation.
let x the number of flaws on the surface of a randomly selected boiler of a certain type have a poisson distribution
A fair dice is rolled twice and the dots on the top face events defined as: A=First roll gives an odd number C=the sum of two rolls is odd. Find the probability of event C using events A and B.
Chapter 10 Data Set 2 contains the population of scores for the 10 other classes in Mark's university. How did Mark's class do?
to identify the need for services in the coming summer months the mayor wants to identify potential high crime areas of
For a hypothesis comparing two population means, what is the critical value for a one-tailed hypothesis test, using a 5% level of significance level, with both sample sizes equal to 13? Assume the population standard deviations are equal.
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