1. A researcher is interested in the relationship between IQ and longevity. A sample of n = 200 obituaries is selected from the newspaper and old school records are consulted to determine the individuals' IQ scores when they were between the ages of 10 and 20. The individuals were then classified into two IQ groups and three age groups at the time of death. The data are as follows. Show your work and use the back of the page if necessary. Age at the time of death < 60 60 to 75 > 75 IQ < 110 41 63 36 140 IQ > 110 9. 27 24 60 50 90 60 N = 200 a) At alpha = .05, what is the chi-square critical value? b) Please perform the appropriate statistical analyses and report the results and decide whether or not it is significant. c) Make a general conclusion (Use regular words to describe what is going on) and describe the nature (if any) of the relationship found.

1. A researcher is interested in the relationship between IQ and longevity. A sample of n = 200 obituaries is selected from the newspaper and old school records are consulted to determine the individuals' IQ scores when they were between the ages of 10 and 20. The individuals were then classified into two IQ groups and three age groups at the time of death. The data are as follows. Show your work and use the back of the page if necessary. Age at the time of death < 60 60 to 75 > 75 IQ < 110 41 63 36 140 IQ > 110 9. 27 24 60 50 90 60 N = 200 a) At alpha = .05, what is the chi-square critical value? b) Please perform the appropriate statistical analyses and report the results and decide whether or not it is significant. c) Make a general conclusion (Use regular words to describe what is going on) and describe the nature (if any) of the relationship found.

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

1. A researcher is interested in the relationship between IQ and longevity. A sample of n = 200
obituaries is selected from the newspaper and old school records are consulted to determine the
individuals' IQ scores when they were between the ages of 10 and 20. The individuals were
then classified into two IQ groups and three age groups at the time of death. The data are as
follows. Show your work and use the back of the page if necessary.
Age at the time of death
< 60
60 to 75
> 75
IQ < 110
IQ > 110
41
63
36
140
27
24
60
50
90
60
N = 200
a) At alpha = .05, what is the chi-square critical value?
b) Please perform the appropriate statistical analyses and report the results and decide
whether or not it is significant.
c) Make a general conclusion (Use regular words to describe what is going on) and describe
the nature (if any) of the relationship found.

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