Answered: Here are summary statistics for…

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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Question

Here are summary statistics for randomly selected weights of newborn girls: n=186, x=31.6 hg, s=7.8 hg Construct a confidence interval estimate of the mean. Use a 90% confidence level. Are these results very different from the confidence interval 30.6 hg<μ<33.6 hg with only 18 sample values, x=32.1 hg, and s=3.6 hg? what is the confidence interval for the mean population

are the results between 2 confidence very different

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 + ...

Expert Solution

Step 1

The summary statistics for randomly selected weights of newborn girls:

$n = 186 , \bar{x} = 31.6 h g, s = 7.8 h g$

It is required to construct a 90% confidence interval for mean.

Since the sample size is large, according to Central limit theorem, the sampling distribution of sample mean can be taken as normal distribution. Since the population standard deviation is unknown, we will use t-distribution based confidence interval here.