2. It has been hypothesized that children's performance on aparticular test of spatial ability will improve significantlybetween the ages of 10 and 12. To test this hypothesis,eight 10-year-old children are given the spatial ability testand then, two years later as 12-year-olds, are given thesame test a second time. The following data were obtained:10-year-old scoresChildrenyear-old scores1234567 ∞DESSENCE8203226361825301612-XHAXHIN2834274028243421a) Are the children's spatial ability scores as 12-year-olds significantly higher than they were at 10 yearsof age (alpha = .005)? (3 9b) Is the variance of the children's scores as 10-year-olds significantly different from 68.5: the typicalpopulation variance (alpha = .05)? (^^

a) To determine if the children's spatial ability scores at 12-year-olds are significantly higher…

Answered: 2. It has been hypothesized that…

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 graduate student is interested in how viewing different types of scenes affects working memory. For his study, he selects a random sample of 36 adults. The subjects complete a series of working memory tests before and after walking in an urban setting. Before the walk, the mean score on the test of working memory was 9.1. After the walk, the mean score was 1.4 higher. The graduate student has no presupposed assumptions about how viewing different types of scenes affects working memory, so he formulates the null and alternative hypotheses as: H00 : μDD = 0 H11 : μDD ≠ 0 Assume that the data satisfy all of the required assumptions for a repeated-measures t test. The graduate student calculates the following statistics for his hypothesis test: Mean difference (MDD) 1.4 Estimated population standard deviation of the differences (s) 1.6 Estimated standard error of the mean differences (sMDMD) 0.2667 Degrees of freedom (df) 35 The t statistic 5.25 The critical values of t…
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