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The workers in a large meat packing plant earn annual incomes with mean = $30,000 and standard deviation of $9000. A labor lawyer plans to randomly sample 36 incomes from this population. The lawyer is worried that her sample mean will be misleadingly high. A statistician assures her that it is unlikely that the sample mean will exceed the population mean by more than 10%. Calculate just how unlikely it is
the milton area chamber of commerce wanted to know whether the mean weekly salary of nurses was larger than that of
A South American custom candy producer wants to know if the mean daily consumption of regular sugar sweetened candy eaters is less than that of artificial sweetened candy eaters.
The diameters of grapefruits in certain orchard are normally distributed with mean of 6.95 inches and a standard deviation of 0.75 inches. Show all work.
The sample mean life is 805 hours with 64 hours of the sample standard deviation. Is there enough evidence to conclude that the manufacturer's claim is true at the 5% significance level?
the mean score of a college entrance test is 500 the standard deviation is 75. the scores are normally distributed.
Compute a 95% confidence interval for the mean saline of the tears. You select a random sample of 100 tear drops. The sample has an average salt concentration of 0.1 with a standard deviation of 0.01.
A nationwide standardized test taken by high school juniors and seniors may or may not measure academic potential, but we can nonetheless examine the relationship bewteen scores on such test and performance in college.
How many ships must be included in the sample if the CEO wants the error to be within 0.02 and a confidence level of 95% if: there is no information available that could be used as an estimate of the population proportion?
A population of scores forms a normal distribution with a mean of 40 and a standard deviation of 12. What is the probability of randomly selecting a score less than x=34?
How do I define the the population and select a simple random sample of size n from the population? A random sample of n=12 values taken from a normally distributed population resulted in the following sample value:
A random sample of 72 statistics students was taken to estimate the proportion of students who are also in the Math Club. The 90% confidence interval was 0.438 to 0.642. Using this information, what sample size would be necessary to estimate the t..
x1, x2, x3 are zero mean Gaussian random variables with STD=4. Let x1 and x2 be independent and x3= a*x1+b*x2. Find the constants “a” and “b” such that the correlation between x1 and x3 is 0.3. What is the correlation between x3 and x2?
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