Answered: a. The t-values are the proportions of…

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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100%

a. The t-values are the proportions of the areas in two tails of the t-curve are also called __________.
critical values
critical region
point estimate
confidence interval

b. The expression σ/√n (sigma over square root of n) is referred to as:
standard deviation ofthe raw score distribution
mean of the sampling distribution of proportions
mean of the sampling distribution
standard error of the sampling distribution of means

c. Assuming that the samples come from normal distributions, find the margin of error E given the following: n=27, x(mean) = 92.8, s=2.6, 99% confidence
1.19
1.18
1.39
1.38

d. A sample of 60 Grade 11 student's ages was obtained to estimate the mean age of all Grade 11. The mean X(bar) =17.5 years and the population variance is 16. What is the point estimate for μ?
16
17
17.5
none of these

e. A sample of 60 Grade 11 student's ages was obtained to estimate the mean age of all Grade 11. The mean X(bar) =17.5 years and the population variance is 16. What is the 99% confidence interval for μ?
12.17 - 22.83
12 - 23
12.18 - 22.82
none of these

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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