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In: Statistics and Probability

2. As a newly hired manager of a company thatprovides cell phone service, you want to...

2. As a newly hired manager of a company thatprovides cell phone service, you want to determine the percentage of adults in your state who live in a household with cell phones and no land-line phones. How many adults must you survey? Assume that you want to be 90% confident that the sample percentage is within threepercentage points of the true population percentage

if possible include graph

Expert Solution

Solution :

Given that,

= 0.5

1 - = 1 - 0.5 = 0.5

margin of error = E = 3% = 0.03

At 90% confidence level

= 1 - 90%

= 1 - 0.90 =0.10

/2 = 0.05

Z/2 = Z0.05 = 1.645 ( Using z table )

Sample size = n = (Z/2 / E)2 * * (1 - )

= (1.645 / 0.03)2 * 0.5 * 0.5

=751.6736

=752

orchestra answered 2 years ago

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