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Description: A researcher wants to perform a hypothesis test to determine whether the mean length of marriages in California differs from the mean length of marriages in Texas. A. Let U1 denote the mean length of marriages in California and let U2 denote the mean

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018

18th Edition

ISBN:9780079039897

Author:Carter

Publisher:Carter

Chapter10: Statistics

Section10.3: Measures Of Spread

Problem 1GP

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A researcher wants to perform a hypothesis test to determine whether the mean length of marriages in California differs from the mean length of marriages in Texas.

A. Let U1 denote the mean length of marriages in California and let U2 denote the mean length of marriages in Texas. The null and alternative hypotheses are H0:U1=U2 and H1:U1 does not equal U2

B. Let X1 denote the mean length of marriages in California and let X2 denote the mean length of marriages in Texas. The null and alternative hypotheses are H0:X1=X2 and H1:X1 does not equal X2

C. Let U1 denote the mean length of marriages in California and let U2 denote the mean length of marriages in Texas. The null and alternative hypotheses are H0:U1 does not equal U2 and H1:U1=U2

D. Let X1 denote the mean length of marriages in California and let X2 denote the mean length of marriages in Texas. The null and alternative hypotheses are H0:X1 does not equal X2 and H1:X1=X2

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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