To estimate the mean number of days that an employee was absent from work last year, Hamilton Manufacturing took a random sample of 600 of its employees. The mean of the sample was 16.3. It is known that the population standard deviation is σ=5.1. The 95% confidence interval was therefore approximately 16.3± m. What is the width of the confidence interval
To estimate the mean number of days that an employee was absent from work last year, Hamilton Manufacturing took a random sample of 600 of its employees. The mean of the sample was 16.3. It is known that the population standard deviation is σ=5.1. The 95% confidence interval was therefore approximately 16.3± m. What is the width of the confidence interval
To estimate the mean number of days that an employee was absent from work last year, Hamilton Manufacturing took a random sample of 600 of its employees. The mean of the sample was 16.3. It is known that the population standard deviation is σ=5.1. The 95% confidence interval was therefore approximately 16.3± m. What is the width of the confidence interval
To estimate the mean number of days that an employee was absent from work last year, Hamilton Manufacturing took a random sample of 600 of its employees. The mean of the sample was 16.3. It is known that the population standard deviation is σ=5.1. The 95% confidence interval was therefore approximately 16.3± m. What is the width of the confidence interval?
Definition Definition Measure of central tendency that is the average of a given data set. The mean value is evaluated as the quotient of the sum of all observations by the sample size. The mean, in contrast to a median, is affected by extreme values. Very large or very small values can distract the mean from the center of the data. Arithmetic mean: The most common type of mean is the arithmetic mean. It is evaluated using the formula: μ = 1 N ∑ i = 1 N x i Other types of means are the geometric mean, logarithmic mean, and harmonic mean. Geometric mean: The nth root of the product of n observations from a data set is defined as the geometric mean of the set: G = x 1 x 2 ... x n n Logarithmic mean: The difference of the natural logarithms of the two numbers, divided by the difference between the numbers is the logarithmic mean of the two numbers. The logarithmic mean is used particularly in heat transfer and mass transfer. ln x 2 − ln x 1 x 2 − x 1 Harmonic mean: The inverse of the arithmetic mean of the inverses of all the numbers in a data set is the harmonic mean of the data. 1 1 x 1 + 1 x 2 + ...
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