Answered: In families with several children, the…

Name: In families with several children, the first-born tend to be more rese
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Description: In families with several children, the first-born tend to be more reserved and serious, whereas the last-born tend to be more outgoing and happy-go-lucky. A psychologist is using a standardized personality inventory to measure the magnitude of this d

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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In families with several children, the first-born tend to be more reserved and serious, whereas the last-born tend to be more outgoing and happy-go-lucky. A psychologist is using a standardized personality inventory to measure the magnitude of this difference. Two samples are used: 8 first-born children and 8 last-born children. Each child is given the personality test. The results are as follows:

First-born	Last-born
M = 11.4	M = 13.9
SS = 26	SS = 30

Calculate the test statistic and state your conclusion using a two-tailed test at the .05 level of significance. Be sure to state your conclusion.
Calculate the confidence interval at 80%. (Hint: You will need to calculate the pooled variance and estimated standard error)

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