Answered: ) Wi-Fi Access A survey of 40 students…

Algebra & Trigonometry with Analytic Geometry

13th Edition

ISBN:9781133382119

Author:Swokowski

Publisher:Swokowski

Chapter10: Sequences, Series, And Probability

Section10.8: Probability

Problem 59E

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1a) Wi-Fi Access A survey of 40 students in grades 4 through 12 found 70%
have classroom Wi-Fi access. Find the 90% confidence interval of the population proportion. Use a graphing calculator and round the answers to at least three decimal places.

___ < p < ___

1b) Home Internet Access According to a study, 78% of adults ages18-29

years had broadband Internet access at home in 2011. A researcher wanted to estimate the proportion of undergraduate college students (18-23 years) with access, so she randomly sampled 180 undergraduates and found that 157 had access. Estimate the true proportion with 90%
confidence. Use a graphing calculator and round the answers to at least three decimal places.

___ < p < ___

1c) A study of life expectancy showed that a random sample of 6 states had a standard deviation of 0.6 deaths per year. Find the 99% confidence intervals of the variance and standard deviation. Assume the variable is normally distributed. Use the chi-square distribution table to find any chi-square values to three decimal places. Round your final answers to one decimal place.

___ < σ² <___

___ < σ <___

This question has three parts, a b and c. Please answer all parts of the question. Thanks

Features Features Normal distribution is characterized by two parameters, mean (µ) and standard deviation (σ). When graphed, the mean represents the center of the bell curve and the graph is perfectly symmetric about the center. The mean, median, and mode are all equal for a normal distribution. The standard deviation measures the data's spread from the center. The higher the standard deviation, the more the data is spread out and the flatter the bell curve looks. Variance is another commonly used measure of the spread of the distribution and is equal to the square of the standard deviation.

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