Question
In: Statistics and Probability
In a study of cell phone use and brain hemispheric dominance, an Internet survey was e-mailed...
In a study of cell phone use and brain hemispheric dominance, an Internet survey was e-mailed to
2592
subjects randomly selected from an online group involved with ears.
913
surveys were returned. Construct a
99%
confidence interval for the proportion of returned surveys.
Solutions
Expert Solution
We have given,
x=913
n=2592
Estimate for sample proportion=
0.3522
Level of significance is =1-0.99=0.01
Z critical value(using Z table)=2.576
Confidence interval formula is
=(0.3280,0.3764 )
Lower limit for confidence interval=0.328
Upper limit for confidence interval=0.3764
orchestra answered 1 year agoRelated Solutions
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6978 subjects randomly selected from an online group involved
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claim that the return rate is less than 20%. Use the P-value
method and use the normal distribution as an approximation to the
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