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Question: Samples from the mine show the following percentages of gold:
1.1, 0.3, 1.5, 0.4, 0.8, 2.2, 0.7, 1.4, 0.2, 4.5, 0.2, 0.8
a. Compute and interpret the sample standard deviation.
b. Compute and interpret the coefficient of variation.
c. Which data value has the largest positive deviation? Why is this location special to you?
d. How many standard deviations above the mean is the data value with the largest positive deviation?
What sample size would allow us to increase our confidence level to 95% while reducing the margin of error to only 3 hours? Round up to the nearest whole number
if the distribution is approximately normal the t-test is a more powerful test about the central tendecy of the
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A researcher is interested in estimating noise levels in decibels at area urban hospitals. She wants to be 90% confident that her estimate is correct. If the standard deviation is 4.13, how large a sample is required to get the desired information..
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Survey was mailed to a total of 400 students; 100 were randomly selected from each of the freshman, sophomore, junior and senior classes last semester. What sampling method was used?
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