Suppose an advertising company wants to determine the current percentage of customers who read print magazines. How many customers should the company survey in order to be 98% confident that the estimated (sample) proportion is within 5percentage points of the true population proportion of customers who read print magazines? z0.10 z0.05 z0.025 z0.01 z0.005 1.282 1.645 1.960 2.326 2.576

Suppose an advertising company wants to determine the current percentage of customers who read print magazines. How many customers should the company survey in order to be 98% confident that the estimated (sample) proportion is within 5percentage points of the true population proportion of customers who read print magazines? z0.10 z0.05 z0.025 z0.01 z0.005 1.282 1.645 1.960 2.326 2.576

Holt Mcdougal Larson Pre-algebra: Student Edition 2012

1st Edition

ISBN:9780547587776

Author:HOLT MCDOUGAL

Publisher:HOLT MCDOUGAL

Chapter11: Data Analysis And Probability

Section: Chapter Questions

Problem 7CR

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z0.10	z0.05	z0.025	z0.01	z0.005
1.282	1.645	1.960	2.326	2.576

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A 2016 Pew Research poll found that 18% of cell phone owners use their phone for conducting transactions with their bank. Let’s assume that 0.18 is the true proportion (in 2016) of all cell phone owners who use their cell phone for banking. (a) You take a random sample of 150 current cell phone owners and find that 38 of them use their cell phone for banking. Is this convincing evidence that since 2016 there has been an increase from 0.18 in the proportion of cell phone owners who use their cell phone for banking? Use  = 0.05. (b) Suppose the question you asked the people in your sample was, “People on the go use their cell phone for everything. Do you ever use yours to conduct your banking business?” Comment on the potential bias arising from the way this question was asked and its’ impact on your conclusion.
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A study is to be made to estimate the proportion of residents of a certain city and its suburbs who favor the construction of a nuclear power plant near the city. How large a sample is needed if one wishes to be at least 90% confident that the estimate is within 0.03 of the true proportion of residents who favor the construction of the nuclear power plant?
A study is to be made to estimate the proportion of residents of a certain city and its suburbs who favor the construction of a nuclear power plant near the city. How large a sample is needed if one wishes to be at least 90% confident that the estimate is within 0.06 of the true proportion of residents who favor the construction of the nuclear power plant?
Suppose a cable network wants to determine the current percentage of customers who are under the age of twenty. How many customers should the network survey in order to be 90% confident that the estimated (sample) proportion is within 3 percentage points of the true population proportion of customers who are under the age of twenty? z0.10 z0.05 z0.025 z0.01 z0.005 1.282 1.645 1.960 2.326 2.576
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A researcher wants to estimate the prevalence of breast cancer among women who are between 35 and 45 years of age living in Western Visayas. How many women must be involved in the study to ensure that the estimate is precise? If national data suggest that 1 in 235 women are diagnosed with breast cancer by age 40, this translates to a proportion of 0.0043 (0.43%) or prevalence of 43 per 10,000 women. Suppose the researcher wants the estimate to be within 10 per 10,000 women with 95% confidence. What would be the sample size? Show your solution including the formula you used.
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