Answered: 1. At Abraham Lincoln High School an…

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

1. At Abraham Lincoln High School an achievement test is used for college placement. Counselors
selected a simple random sample of 15 students from the school and scored their tests by hand
before sending them in for computer processing. For this sample, ?̅ =525 and ?=24.
Assuming that the test scores are normally distributed, construct a 99% confidence interval for
μ, the population mean score for Abraham Lincoln High School.

a) Are the criteria for approximate normality satisfied? Explain.

b) Determine the sample mean, sample standard deviation, and sample size.

c) Determine the critical value that corresponds to the 99% level of confidence.

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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