Answered: Assume that we want to construct a…

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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Assume that we want to construct a confidence interval. Do one of the following, as appropriate: (a) find the critical value

tα/2,

(b) find the critical value

zα/2,

or (c) state that neither the normal distribution nor the t distribution applies.

Here are summary statistics for randomly selected weights of newborn girls:

n=166,

x=32.8

hg,

s=6.2

hg. The confidence level is

90%.

Select the correct choice below and, if necessary, fill in the answer box to complete your choice.

Assume that we want to construct a confidence interval. Do one of the following, as appropriate: (a) find the critical value $ t_{\alpha/2} $, (b) find the critical value $ z_{\alpha/2} $, or (c) state that neither the normal distribution nor the t distribution applies.

Here are summary statistics for randomly selected weights of newborn girls: $ n = 166 $, $ \bar{x} = 32.8 $ hg, $ s = 6.2 $ hg. The confidence level is 90%.

Select the correct choice below and, if necessary, fill in the answer box to complete your choice.

A. $ t_{\alpha/2} = $ [ ]
(Round to two decimal places as needed.)

B. $ z_{\alpha/2} = $ [ ]
(Round to two decimal places as needed.)

C. Neither the normal distribution nor the t distribution applies.

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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