Infants, even newborns, prefer to look at attractive faces compared to less attractive faces (Slater et al., 1998). Inthe study, infants from 1 to 6 days old were shown two photographs of women's faces. Previously, a group of adultshad rated one of the faces as significantly more attractive than the other. The babies were positioned in front of ascreen on which the photographs were presented. The pair of faces remained on the screen until the babyaccumulated a total of 20 seconds of looking at one or the other. The number of seconds looking at the attractiveface was recorded for each infant. Suppose that the study used a sample of n = 9 infants and the data produced anaverage of M = 13 seconds for the attractive face with SS72. Note that all the available information comes fromthe sample. Specifically, we do not know the population mean or the population standard deviation. What is the null hypothesis?Ho:Use a two-tailed test with a = .05 to evaluate the hypothesis. (Show three decimal places.)t-criticalThe results indicate:Rejection of the null hypothesis; there is a significant preference.Failure to reject the null hypothesis; there is a significant preference.Failure to reject the null hypothesis; there is not a significant preference.Rejection of the null hypothesis; there is not a significant preference.

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Description: Infants, even newborns, prefer to look at attractive faces compared to less attractive faces (Slater et al., 1998). Inthe study, infants from 1 to 6 days old were shown two photographs of women's faces. Previously, a group of adultshad rated one of

Null and alternate hypotheses: The investigator is interested to test whether the mean number of…

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Infants, even newborns, prefer to look at attractive faces compared to less attractive faces (Slater et al., 1998). In the study, infants from 1 to 6 days old were shown two photographs of women's faces. Previously, a group of adults had rated one of the faces as significantly more attractive than the other. The babies were positioned in front of a screen on which the photographs were presented. The pair of faces remained on the screen until the baby accumulated a total of 20 seconds of looking at one or the other. The number of seconds looking at the attractive face was recorded for each infant. Suppose that the study used a sample of n = 9 infants and the data produced an 72

Infants, even newborns, prefer to look at attractive faces compared to less attractive faces (Slater et al., 1998). In the study, infants from 1 to 6 days old were shown two photographs of women's faces. Previously, a group of adults had rated one of the faces as significantly more attractive than the other. The babies were positioned in front of a screen on which the photographs were presented. The pair of faces remained on the screen until the baby accumulated a total of 20 seconds of looking at one or the other. The number of seconds looking at the attractive face was recorded for each infant. Suppose that the study used a sample of n = 9 infants and the data produced an 72

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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