### Segments in this Video

#### Outline: Independent T-Tests: Lecture 8(01:38)

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In this lecture, Prof. Naomi Lowe will explain the types of T-tests; hypothesis, distribution of mean differences, and calculations of independent T-tests; effect size; and issues with T.

#### Types of T-Tests(02:21)

Types include: one-sample, dependent (paired) T, and independent (two sample) T.

#### Independent T: Hypothesis Testing(11:09)

Compare two samples using sample information from both populations; scores are independent from each other. The types of variables for these T-tests are nominal two-level and continuous. See examples using S.I. and exam scores, and two identical populations.

#### Independent T: Distribution of Mean Differences(07:57)

Use information from previous calculations. If the null is true, both populations have equal means; the T-distribution will center around zero. See an example involving students reading their names in a story.

#### Independent T: Spread of SD of Mean Differences(10:56)

Calculating standard error takes several stepsâ€”comparison distribution, population variances, pooled variances, pooled distribution of means, variance distribution of means, and standard distribution of the differences of means (S.E.). See examples of each step.

#### Independent T: Calculations Using Pooled Standard Error(07:10)

Calculate the T-score and examine the cut-off on the T-distribution. Plot calculations on the diagram and determine whether to accept or reject the null.

#### Independent T: Assumptions(02:12)

T-test assumptions are that the populations are normally distributed and the variance is equalâ€”homogeneity of variance (HOV).

#### Effect Size(01:31)

Effect size for the sampling of independent T-testing requires number substitution; it measures the size of the difference between groups. See the formula for estimating effect size.

#### Issues With T(02:36)

Cut-offs in the T-table assume one is performing a single T-test. Running multiple tests with the same data can result in a false rejection of the null.

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# Independent T-Tests: Lecture 8

Part of the Series : Statistics With Naomi Lowe
 DVD (Chaptered) Price: \$129.95 DVD + 3-Year Streaming Price: \$194.93 3-Year Streaming Price: \$129.95

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### Description

In this video lecture, Professor Naomi Lowe explains Independent T-Tests.

Length: 48 minutes

Item#: BVL150108

ISBN: 978-1-64347-560-8