Comments on: Unpaired T-Test https://www.datanovia.com/en/lessons/types-of-t-test/unpaired-t-test/ Data Mining and Statistics for Decision Support Fri, 22 May 2020 10:17:04 +0000 hourly 1 https://wordpress.org/?v=6.8.2 By: kassambara https://www.datanovia.com/en/lessons/types-of-t-test/unpaired-t-test/#comment-19886 Fri, 22 May 2020 10:17:04 +0000 https://www.datanovia.com/en/?post_type=dt_lessons&p=11650#comment-19886 In reply to Hafsteinn Ragnarsson.

Thank you for pointing this out, updated now! Correct sentences are:

1) “if you want to test whether the average women’s weight (group 1) is less than the average men’s weight (group 2), type this : [alternative = “less”]

2) “Or, if you want to test whether the average women’s weight (group 1) is greater than the average men’s weight (group 2), type this”: [alternative = “greater”]

]]> By: Hafsteinn Ragnarsson https://www.datanovia.com/en/lessons/types-of-t-test/unpaired-t-test/#comment-19882 Thu, 21 May 2020 11:56:00 +0000 https://www.datanovia.com/en/?post_type=dt_lessons&p=11650#comment-19882 Great lesson overall!

Just one thing I noticed. When you explain the one-tailed variants of the t-tests you say:

“If you want to test whether the average men’s weight is less than the average women’s weight, type this: [alternative = “less”]”
AND
“Or, if you want to test whether the average men’s weight is greater than the average women’s weight, type this: [alternative = “greater”]”

In the example the women’s weight is less than the men’s weight. I get the former one-tailed t-test as significant while the latter is not significant. Isn’t there a mistake in the description?

At least on my system, “alternative = “less”” examines whether the average women’s weight is less than the average men’s weight, and vice versa. Am I understanding it correctly?

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