1. Student's t test for correlated groups really reduces to _________.a.the sign testb.Student's t test for single samples using difference scoresc.Students t test for independent groupsd.none of the above 2. The z test for independent groups is seldom used because _________.it lacks sensitivityit is too complicatedwe seldom know the population variancesthe sampling distribution of z under H0 is unknown 3. In a t test, when the size of the sample is increased, the confidence interval _________.increasesdecreasesstays the samechanges shapea and d 4. As the df increases, the t distribution _________.gets more symmetricalapproaches the normal distributionstays the samebecomes more skewed

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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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1. Student's t test for correlated groups really reduces to _________.

a.	the sign test
b.	Student's t test for single samples using difference scores
c.	Students t test for independent groups
d.	none of the above

2. The z test for independent groups is seldom used because _________.

it lacks sensitivity
it is too complicated
we seldom know the population variances
the sampling distribution of z under H0 is unknown

3. In a t test, when the size of the sample is increased, the confidence interval _________.

increases
decreases
stays the same
changes shape
a and d

4. As the df increases, the t distribution _________.

gets more symmetrical
approaches the normal distribution
stays the same
becomes more skewed

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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