# statistics and probabilities - 68927

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## teddyj0406

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• From: Mathematics,
• Due on: Sun 13 Jul, 2014 (06:22pm)
• Asked on: Sun 13 Jul, 2014
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Exercise Set 7.2 (42 & 46)
Exercise Set 7.3 (22)
Exercise Set 7.4 (22)
Exercise Set 7.5 (18)

7.2  (42 and 46)

7.2
42) Cell Phones-find the minimum sample size required to estimate a population proportion or percentage
As the newly hired manager of a company that provides cell phone service, you want to determine the perentage 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 4 percentage points of the true population percentage
A) Assume that nothing is known about the percentage of adults who live in a household with cell phones and no landline phones.
B) Assume that a recent survey suggests that about 8 percent of adults live in a household with cell phones and no landline phones.

All other questions and excel docs needed are attached

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