Answered: A researcher found that a cigarette…

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

A researcher found that a cigarette smoker smokes on average 30 cigarettes a day. She feels that this
average is too high. She selected a random sample of 9 smokers and found that the mean number of cigarettes they smoked per
day was 29. The sample standard deviation was 2.3. At a =0.05, is there enough evidence to support her claim? Assume that the
population is approximately normally distributed. Use the critical value method and tables.

h0:

h1:

Features Features Normal distribution is characterized by two parameters, mean (µ) and standard deviation (σ). When graphed, the mean represents the center of the bell curve and the graph is perfectly symmetric about the center. The mean, median, and mode are all equal for a normal distribution. The standard deviation measures the data's spread from the center. The higher the standard deviation, the more the data is spread out and the flatter the bell curve looks. Variance is another commonly used measure of the spread of the distribution and is equal to the square of the standard deviation.

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