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Suppose that, as a researcher, you're interested in the possible interplay between age and face recognition. You choose 75 participants, 15 of whom are young children, 15 of whom are teenagers, 15 of whom are in their thirties, 15 of whom are middle-aged, and 15 of whom are senior citizens. You let each participant examine a collection of 35 photographs of faces of college students. You then test the participant by presenting, on a computer display and one at a time, a sequence of 70 faces (some familiar and some new). You ask the participant to identify each presented face as being part of the original collection or not part of the original collection. You record the total time (in seconds) that each participant takes to make all 70 of her responses. These times are summarized here: Group Young children Teenagers In their thirties Middle-aged Senior citizens Sample Sample Sample size mean variance 15 15 15 15 15 68.0 70.8 63,4 68.9 65.1 62.8 28.4 23.3 36.9 52.3 Send data to calculator Suppose that the populations of times for each of the five age groups represented in this experiment are approximately normally distributed and have the same mean and the same variance. Answer the following, carrying your intermediate computations to at least three decimal places and rounding your responses to at least one decimal place. (6) Give an estimate of this common population variance based on the variance of the sample means given (b) Give an estimate of this common population variance by pooling the sample variances given 0 Español no

Suppose that, as a researcher, you're interested in the possible interplay between age and face recognition. You choose 75 participants, 15 of whom are young children, 15 of whom are teenagers, 15 of whom are in their thirties, 15 of whom are middle-aged, and 15 of whom are senior citizens. You let each participant examine a collection of 35 photographs of faces of college students. You then test the participant by presenting, on a computer display and one at a time, a sequence of 70 faces (some familiar and some new). You ask the participant to identify each presented face as being part of the original collection or not part of the original collection. You record the total time (in seconds) that each participant takes to make all 70 of her responses. These times are summarized here: Group Young children Teenagers In their thirties Middle-aged Senior citizens Sample Sample Sample size mean variance 15 15 15 15 15 68.0 70.8 63,4 68.9 65.1 62.8 28.4 23.3 36.9 52.3 Send data to calculator Suppose that the populations of times for each of the five age groups represented in this experiment are approximately normally distributed and have the same mean and the same variance. Answer the following, carrying your intermediate computations to at least three decimal places and rounding your responses to at least one decimal place. (6) Give an estimate of this common population variance based on the variance of the sample means given (b) Give an estimate of this common population variance by pooling the sample variances given 0 Español no

MATLAB: An Introduction with Applications
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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Suppose that, as a researcher, you're interested in the possible interplay between age and face recognition. You choose 75 participants, 15 of whom are young children, 15 of whom are teenagers, 15 of whom are in their thirties, 15 of whom are middle-aged, and 15 of whom are senior citizens. You let each participant examine a collection of 35 photographs of faces of college students. You then test the participant by presenting, on a computer display and one at a time, a sequence of 70 faces (some familiar and some new). You ask the participant to identify each presented face as being part of the original collection or not part of the original collection. You record the total time (in seconds) that each participant takes to make all 70 of her responses. These times are summarized here: Group Young children Teenagers In their thirties Middle-aged Senior citizens Sample size 15 15 Continue 15 15 15 Sample Sample mean variance 68.0 62.8 70.8 63,4 65.1 28.4 23.3 36.9 52.3 Send data to calculator Suppose that the populations of times for each of the five age groups represented in this experiment are approximately normally distributed and have the same mean and the same variance. Answer the following, carrying your intermediate computations to at least three decimal places and rounding your responses to at least one decimal place. (a) Give an estimate of this common population variance based on the variance of the sample means given (b) Give an estimate of this common population variance by pooling the sample variances given. 0 Español had
Transcribed Image Text:Suppose that, as a researcher, you're interested in the possible interplay between age and face recognition. You choose 75 participants, 15 of whom are young children, 15 of whom are teenagers, 15 of whom are in their thirties, 15 of whom are middle-aged, and 15 of whom are senior citizens. You let each participant examine a collection of 35 photographs of faces of college students. You then test the participant by presenting, on a computer display and one at a time, a sequence of 70 faces (some familiar and some new). You ask the participant to identify each presented face as being part of the original collection or not part of the original collection. You record the total time (in seconds) that each participant takes to make all 70 of her responses. These times are summarized here: Group Young children Teenagers In their thirties Middle-aged Senior citizens Sample size 15 15 Continue 15 15 15 Sample Sample mean variance 68.0 62.8 70.8 63,4 65.1 28.4 23.3 36.9 52.3 Send data to calculator Suppose that the populations of times for each of the five age groups represented in this experiment are approximately normally distributed and have the same mean and the same variance. Answer the following, carrying your intermediate computations to at least three decimal places and rounding your responses to at least one decimal place. (a) Give an estimate of this common population variance based on the variance of the sample means given (b) Give an estimate of this common population variance by pooling the sample variances given. 0 Español had
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