A child psychologist prepares four-letter words to be used in a memory test. How many words can she construct if she does not repeat letters and limits her choices to the letters a, b, d, e, i, l, o, and p? how many of these words begin with the letter a? how many have vowels as the second and fourth letters?

A child psychologist prepares four-letter words to be used in a memory test. How many words can she construct if she does not repeat letters and limits her choices to the letters a, b, d, e, i, l, o, and p? how many of these words begin with the letter a? how many have vowels as the second and fourth letters?

A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

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Cognitive psychologists know that memory for the words in the middle of a list is poorer than memory for the words at the beginning or end of the list. Researchers wanted to see if people with different levels of education remember a different number of items in the middle of a list. They selected two groups of people with n=6 in each group. Group 1 has 12 years of formal education and Group 2 has 20 or more years of formal education. The table below shows the number of words each group remembered from the middle 10 words on the list. Group 1 Group 2 4 5 7 7 2 3 4 8 3 6 6 3 a. Is there a significant difference in the number of words remembered from the middle of the list in the two groups? Use an α = .05. b. Compute r2 to measure effect size.
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Cognitive psychologists know that memory for the words in the middle of a list is poorer than memory for the words at the beginning or end of the list. Researchers wanted to see if people with different levels of education remember a different number of items in the middle of a list. They selected two groups of people with n=6 in each group. Group 1 has 12 years of formal education and Group 2 has 20 or more years of formal education. The table below shows the number of words each group remembered from the middle 10 words on the list. Group 1 Group 2 4 5 7 7 2 3 4 8 3 6 6 3 a. Is there a significant difference in the number of words remembered from the middle of the list in the two groups? Use an α = .05. b. Compute r2 to measure effect size.