Use the sample data and confidence level given below to complete parts (a) through (d). In a study of cell phone use and brain hemispheric dominance, an Internet survey was e-mailed to 2444 subjects randomly selected from an online group involved with ears. 1139 surveys were returned. Construct a 95% confidence interval for the proportion of returned surveys. Click the icon to view a table of z scores. a) Find the best point estimate of the population proportion p. (Round to three decimal places as needed.) b) Identify the value of the margin of error E. E=0 (Round to three decimal places as needed.) c) Construct the confidence interval.
Use the sample data and confidence level given below to complete parts (a) through (d). In a study of cell phone use and brain hemispheric dominance, an Internet survey was e-mailed to 2444 subjects randomly selected from an online group involved with ears. 1139 surveys were returned. Construct a 95% confidence interval for the proportion of returned surveys. Click the icon to view a table of z scores. a) Find the best point estimate of the population proportion p. (Round to three decimal places as needed.) b) Identify the value of the margin of error E. E=0 (Round to three decimal places as needed.) c) Construct the confidence interval.
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
100%

Transcribed Image Text:Use
the sample data and confidence level given below to complete parts (a) through (d).
In a study of cell phone use and brain hemispheric dominance, an Internet survey was e-mailed to 2444 subjects randomly selected from an online group involved with
ears. 1139 surveys were returned. Construct a 95% confidence interval for the proportion of returned surveys.
Click the icon to view a table of z scores.
a) Find the best point estimate of the population proportion p.
(Round to three decimal places as needed.)
b) Identify the value of the margin of error E.
E=
(Round to three decimal places as needed.)
c) Construct the confidence interval.
(…)
<p<
(Round to three decimal places as needed.)
d) Write a statement that correctly interprets the confidence interval. Choose the correct answer below.
O A. There is a 95% chance that the true value of the population proportion will fall between the lower bound and the upper bound.
O B. One has 95% confidence that the interval from the lower bound to the upper bound actually does contain the true value of the population proportion.
O C.
One has 95% confidence that the sample proportion is equal to the population proportion.
O D. 95% of sample proportions will fall between the lower bound and the upper bound.

Transcribed Image Text:2
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
1.1
12
13
1.4
1.5
1.6
1.7
1.8
1.9
2.0
21
2.2
2.3
2.4
25
2.6
27
2.8
2.9
3.0
3.1
3.2
3.3
3.4
.00
5000
5398
5793
2
6179
6554
6915
7257
7580
7881
8158
8413
1643
1849
9002
9152
9332
9452
9654
9641
9713
9772
9661
9663
9918
9608
9663
9065
9674
9061
1967
9006
9667
Cumulative Area from the LEFT
.01
5040
5438
5832
6217
9950
7291
7611
7910
8186
3438
2006
9049
9207
9345
9463
9719
9778
9826
9396
9920
9940
.9955
9906
9975
9987
2201
9993
9995
9997
02
5000
5478
5871
6255
6628
6985
7324
7642
7939
8212
3461
8686
9673
9656
3726
9783
098
9622
9641
9956
9676
9904
1996
9667
00
01
NOTE: For of above 3.49, use 0.9999 for the area
POSITIVE Z Scores
8888
9066
9062
1222 3236
9357
9370
5474
9434
02
03
5120
5617
5910
7019
7673
7967
3485
8708
9664
9732
9788
9834
9901
9943
9957
.9977
9994
9666
9997
03
04
5160
5557
5945
6331
6700
7054
.7389
7704
7995
8264
8508
8729
8025
9099
3251
8382
5495 .
9091
9671
9738
9793
9638
3875
9904
9927
9945
9959
9909
9977
3984
9048
9002
9994
9006
9967
04
06
$100
7088
TTM
1073
8531
8749
9115
9394
9506
9744
9798
9642
9946
9970
9978
9994
9997
05
06
5239
5636
5325
6406
6772
71:23
2454
7764
8051
8315
3554
8770
9131
3279
9406
9515
9601
9686
9750
9803
9846
9909
9948
9971
9979
9985
9989
3902
9994
9997
06
07
5279
5675
8064
6443
6808
7157
3486
7794
BOTE
8340
1577
8790
9147
9418
9625
9756
9808
9884
9911
9949
9912
9979
9997
07
08
5319
5714
6103
6480
7190
7823
3106
8365
3599
8810
9162
3306
9429
.9535
9625
9999
3701
9812
9854
3887
991:3
9934
9951
9963
9973
9980
3935
9990
9995
9996
9997
08
09
5350
5753
6141
6617
6879
7224
7549
1852
8133
8389
9015
9177
5019
9441
9645
9767
9617
9690
9916
9964
9074
9961
9000
9998
Common Critical Values
2
0.0
0.1
0.2
0.3
0.4
=====2=223:
0.5
06
0.7
08
0.9
1.0
1.1
1.2
1.4
1.5
1.6
1.7
1.8
1.9
20
2.1
22
23
24
25
26
27
2.8
29
3.0
3.1
32
33
3.4
3.50 and up
2
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