A researcher knows that the weights of 6 year olds are normally distributed with m = 20 kg and s = 5.0. She suspects that children in poverty-stricken regions differ from the population. With a sample of n = 25 children, the researcher obtains a mean of 17 kg. Identify and calculate the appropriate test statistic.Make sure to report the degrees of freedom for the statistical test (if appropriate). State your conclusions (use a two-tailed test with a = .05 for all tests).Compute an effect size.

It is given that the weights of 6 years old are follows normal distribution with mean 20 and…

Answered: A researcher knows that the weights of…

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

1st Edition

ISBN:9781680331141

Author:HOUGHTON MIFFLIN HARCOURT

Publisher:HOUGHTON MIFFLIN HARCOURT

Chapter11: Data Analysis And Displays

Section: Chapter Questions

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A researcher knows that the weights of 6 year olds are normally distributed with m = 20 kg and s = 5.0. She suspects that children in poverty-stricken regions differ from the population. With a sample of n = 25 children, the researcher obtains a mean of 17 kg.

Identify and calculate the appropriate test statistic.Make sure to report the degrees of freedom for the statistical test (if appropriate).
State your conclusions (use a two-tailed test with a = .05 for all tests).
Compute an effect size.

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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