Page 1 Page 2 Standard Normal Distribution
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
Related questions
Question
 alt="Area
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Area
Standard Normal Distribution
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0,02
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0.04
0.05
0.06
0.07
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0.09
Standard Normal Distribution
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Transcribed Image Text:Area
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Area
Standard Normal Distribution
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0.05
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0.09
Standard Normal Distribution
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0.2676
0.3015
0.1736
0.2005
0.2296
0.2611
0.2946
0.1685
0.1940
0.2236
0.2546
0.2877
0.1660
0.1922
02206
02514
02843
2.5
2.6
2.7
0.9938
0.9953
0.9965
0.9074
0,9981
0.9940
0.9955
0.9966
0,9975
0.9982
0.9941
0.9956
0.9967
0.9976
0.9982
0.9943
0.9957
0.9968
0.9945
0.9959
0.9969
0.9977
0.9984
0.9946
0.9960
0.9970
0.9978
0,9984
0.9948
0.9961
0.9971
0,9979
0.9985
0.9949
0.9962
0.9972
0.9979
0.9985
0.9951
0.9963
0,9973
0,9952
0.9964
0.9974
0.1635
0.1894
0.1762
0.2033
0.2327
0.2643
0.2981
0.1711
0.1977
0.2266
0.1611
0.1867
02148
0.2451
0.2776
-0.9
-08
0.9977
0.9983
0.9080
0,9986
0.9981
0.9986
28
0.2177
0.2483
0.2810
-0.7
2.9
0.2578
0.2912
-0.6
0.9089
0,9992
0.9994
0.9996
0.9997
-0.5
3.0
0.9987
0.9987
0,9987
0.9988
0.9988
0.9992
0.9994
0,9989
0.9992
0,9994
0.9989
0.9992
0.9995
0,9990
0,9993
0,9995
0.9990
3.1
3.2
0.9993
0.9995
0.9997
0.9998
0.9990
0,9991
0,9991
0,9991
0.3446
0.3821
0.4207
0.4602
0.5000
0.3409
0.3783
04168
0.3372
0.3745
0.4129
04522
04920
0.3336
0.3707
0.4090
0.4483
0.4880
0.3300
0.3669
0.4052
0.4443
0.4840
0.3264
0.3632
0.4013
0.4404
-04
-0.3
-0.2
-0.1
-0.0
0.3228
0.3594
0.3192
0.3557
0.3156
0.3520
0.3897
0.3121
0,3483
0.3859
0,4247
0.4641
0,9993
0.9995
0.9997
0,9903
0,9994
0.9995
0.9997
0.9994
0.9995
0.9997
0.9996
0.9997
0.3974
0.3936
3.3
0.9996
0.9996
0.9996
0.9996
3.4
0.9997
0.9997
0.9997
0.9997
04562
0.4960
0.4364
0.4761
0.4325
04721
04286
0.4801
0.4681
0,00
0.01
0,02
0.03
0.04
0.05
0.06
0.07
0.08
0.09
0,00
0.01
0,02
0,03
0,04
0,05
0,06
0,07
0,08
0.09

Transcribed Image Text:According to a study, the proportion of people who are satisfied with the way things are going in their lives is 0.88. Suppose that a random sample of 100 people is obtained. Complete parts (a) through (e) below.
Click here to view the standard normal distribution table (page 1).
Click here to view the standard normal distribution table (page 2).
(c) Describe the sampling distribution of p, the proportion of people who are satisfied with the way things are going in their life. Be sure to verify the model requirements.
Since the sample size is no more than 5% of the population size and np(1 - p) = 10.56 2 10, the distribution of p is approximately normal with Ha = 0.880 and o. = 0.032
(Round to three decimal places as needed.)
(d) In the sample obtained in part (a), what is the probability that the proportion who are satisfied with the way things are going in their life exceeds 0.91?
The probability that proportion who are satisfied with the way things are going in their life exceeds 0.91 is 0.1736
(Round to four decimal places as needed.)
(e) Using the distribution from part (c), would it be unusual for a survey of 100 people to reveal that 80 or fewer people in the sample are satisfied with their lives?
The probability that 80 or fewer people in the sample are satisfied is
which
unusual because this probability
less than
%.
(Round to four decimal places as needed.)
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