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Hemoglobin levels in 11-year-old boys vary according to a normal distribution with σ=1.2 g/dL.
a) How large a sample is needed to estimate µ with 95% confidence, so the margin of error is no greater than 0.5 g/dL?
b) How large a sample is needed to estimate µ with margin of error 0.5 g/dL with 99% confidence?
Give an example of how a project manager could run into problems with cash flow, even when he is within budget on the overall project.
Inspection of a random sample of 19 aircraft showed that 6 needed repairs to fix a wiring problem that might compromise safety.
Does the evidence suggest that postpartum women do not get enough sleep? Use =0.05 level of significance. How is the problem set up using the classical and P-value approach.
a. What is the probability an individual weighs more than 95Kg? b. The company has decided that the elevator will have a capacity of 5 people and a maximum load of 475 Kg. What is the probability that load will be exceeded if there are 5 people i..
A tollbooth operator has observed that cars arrive randomly at and average randomly at an average rate of 360 cars per hour. (Hint use a Poisson Distribution).
Let m = N/V denote the average number of bacteria per unit volume. Let the volume v of the test tube be equal to 3 cubic centimeters.
a corporation has 11 manufacturing plants. of these 7 are domestic and 4 are located outside the united states. each
Cheating Gas Pumps When testing gas pumps in Michigan for accuracy, fuel-quality enforcement specialists tested pumps and found that 1299 were not accurate (within 3.3 oz when 5 gal is pumped), and 5686 were accurate.
Find the percentage of sums between 1.5 standard deviations below the mean of the sums and one standard deviation above the mean.
A random sample of 15 customers is selected, and the results are as follows: 8.02 4.08 5.79 8.73 5.47 5.64 8.01 10.49 8.35 5.9 9.66 9.91 3.82 6.68 6.17 a) calculate arithmetic mean, median, mode, first quartile and third quartile.
Suppose the random variable x is best described by a normal distribution with µ = 24 and σ = 2.7. Find the z-score that corresponds to each of the following x values.
Compute the standard error of the mean O(funny o with line) line over x, for sample sizes of 50, 100, 15o, and 200. What can you say about the size of the standard error of the mean as the sample size is increased?
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