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Name: The high price of medicines is a source of major expense for those sen
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Description: The high price of medicines is a source of major expense for those seniors in the United States who have to pay for these medicines themselves. A random sample of 2100 seniors who pay for their medicines showed that they spent an average of $4500 las

Big Ideas Math A Bridge To Success Algebra 1: Student Edition 2015

1st Edition

ISBN:9781680331141

Author:HOUGHTON MIFFLIN HARCOURT

Publisher:HOUGHTON MIFFLIN HARCOURT

Chapter4: Writing Linear Equations

Section4.5: Analyzing Lines Of Fit

Problem 25E

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The high price of medicines is a source of major expense for those seniors in the United States who have to pay for these medicines themselves. A random sample of 2100 seniors who pay for their medicines showed that they spent an average of $4500 last year on medicines with a standard deviation of $700. Make a 95% confidence interval for the corresponding population mean.

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$Enter your answer; confidence interval, lower bound to $Enter your answer; confidence interval, upper bound

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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