Answered: Given below is a back-to-back…

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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Question

Given below is a back-to-back stem-and-leaf diagram in which common stems are placed at the center of the diagram while the leaves of the two data set are listed at the left- and right-hand side of the given stems. The following back-to-back stem-and-leaf diagram determines the time in seconds for the two groups of participants to solve a puzzle when exposed to different noise level. The first group of participant solves the puzzle in the classroom wherein the noise level is maintained at 60 decibel. For the other group, a decibel level of 45 was maintained while they solved the same problem.

Group 1	Stem	Group 2
	3	4
5	4	3 3 6 7
7 3 1	5	1 4 4 5 6 8
7 3 3 3 2	6	3 4 5
6 3 2 1	7	3
7 1	8

i) How many participants in group 1 need greater than 45 seconds to solve the puzzle?
ii) How many participants in group 2 require 45 seconds to solve the puzzle?
iii) By examining the stem-and-leaf display, which of the two groups of participants seemed to have a greater mean in seconds required in solving the puzzle?

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