A developmental psychologist would like to determine how much fine motor skill improves for children from age 3 to age 4. She takes a random sample of 9 three-year old children and a second sample of 9 four-year old children and measures fine motor skill in each using a manual dexterity test that measures fine motor skill. Higher scores on this test indicate better fine motor skills. Her data are:Three Year Olds: 35, 36, 39, 29, 35, 34, 33, 34, 35Four Year Olds: 40, 35, 38, 39, 40, 50, 40, 38, 42Is there a significant difference in the motor skills from age three to four? Test with an α = 0.01.What type of error is possible based on the outcome?Calculate and interpret the effect size.Report the mean motor skill score for each of the samples. On average, which group had the better fine motor skills?

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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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A developmental psychologist would like to determine how much fine motor skill improves for children from age 3 to age 4. She takes a random sample of 9 three-year old children and a second sample of 9 four-year old children and measures fine motor skill in each using a manual dexterity test that measures fine motor skill. Higher scores on this test indicate better fine motor skills. Her data are:

Three Year Olds: 35, 36, 39, 29, 35, 34, 33, 34, 35

Four Year Olds: 40, 35, 38, 39, 40, 50, 40, 38, 42

1. 1. Is there a significant difference in the motor skills from age three to four? Test with an α = 0.01.
  2. What type of error is possible based on the outcome?
  3. Calculate and interpret the effect size.
  4. Report the mean motor skill score for each of the samples. On average, which group had the better fine motor skills?

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