Workshop13 - CHEN 3010 Applied Data Analysis Names: Fall...

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CHEN 3010 Applied Data Analysis Fall 2004 Names: __________________________ Workshop #13 Confidence Interval on Mean, Variance Unknown When working with a data sample of a particular measurement taken from a population, you can estimate the mean and variance of that parameter in the population. These estimates are called the sample mean and sample variance (or its square root, the sample standard deviation ). With the estimate, as with individual measurements, there is uncertainty associated with a value. A two- sided confidence interval on the mean gives us a measure of the certainty that the true mean will be within an interval of the calculated sample mean. In this workshop, we will be working with typical data taken from Workshop #6, coffee bag weights. An example set of weights is used here. Directions: 1. Examine the data on the next page. Create a stem-and-leaf chart of your data quickly on your data sheet. Do the data appear to have a central tendency like that shown by a normal distribution? ________ 2. Determine the sample count, mean and variance 1 . Enter these values in the table on the next
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Workshop13 - CHEN 3010 Applied Data Analysis Names: Fall...

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