Answered: Researchers studying starfish collected…

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

Researchers studying starfish collected two independent random samples of 40 starfish. One sample came from an ocean area in the north, and the other sample came from an ocean area in the south. Of the 40 starfish from the north, 6 were found to be over 8 inches in length. Of the 40 starfish from the south, 11 were found to be over 8 inches in length.

Which of the following is the test statistic for the appropriate test to investigate whether there is a difference in proportion of starfish over 8 inches in length in the two ocean areas (north minus south) ?

6−11640+1140√

A
6−110.1540+0.27540√

B
0.15−0.275(0.15)(0.275)(140+140)√

C
0.15−0.275(0.2125)(0.7875)(140+140)√

D
0.15−0.275(0.2125)(0.7875)140+140√

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