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Name: A psychologist claims that the mean age at which children start walkin
Uploaded: 2024-03-20T07:07:12.000Z
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Description: A psychologist claims that the mean age at which children start walking is 12.5 months. Carol wanted to check if the claim is true. She took a random sample of 18 children and found that the mean age at which these children started walking was 12.9 m

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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A psychologist claims that the mean age at which children start walking is 12.5 months. Carol wanted to check if the claim is true. She took a random sample of 18 children and found that the mean age at which these children started walking was 12.9 months with a standard deviation of 0.8 months. It was known that the ages at which all children start walking are approximately normally distributed. Test Carol's claiming using a 2% level of significance.

With this problem, I am specifically confused on the very first part - of writing this statement symbolically, and in knowing how to formulate H0 and H1.

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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