27. Call me: A sociologist wants to construct a 95% confidence intervalfor the proportion of children aged 8-12 living in New York who owna cell phone.a. A survey by the National Consumers League estimated thenationwide proportion to be 0.56. Using this estimate, what samplesize is needed so that the confidence interval will have a margin oferror of 0.02?b.Estimate the sample size needed if no estimate of p is available.

It is given that margin of error (E) is 0.02 and the confidence level is 95%.Here,

Answered: 27. Call me: A sociologist wants to…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Suppose we wanted to estimate the mean room rate for luxury hotels in the Northeast. Assume that the standard deviation for room rates is $35 and that we want a 95% confidence interval. What is the smallest sample size should we choose if we want a margin of error for our interval of no more than $10? Type your answer here
32. Touch Your Nose With Your Tongue Find the sample size needed to estimate the percentage of adults who can touch their nose with their tongue. Use a margin of error of 2 percentage points and use a confidence level of 90%. a. Assume that p and à are unknown. b. Assume that a previous study showed that 10% of adults can touch their nose with their tongue (based on data from Onedio). c. Does the use of the results from the previous study have much of an effect on the sample size?
39. Create a 95% confidence interval for the data set below. 49 62 54 64 55 49 48 52 65 53 62 ( , ) [three decimal accuracy] [three decimal accuracy]
Directions: 1. Answer the following items. 2. Find the appropriate sample size given the confidence level, standard deviation, and margin of error. 3. Round off to the nearest whole number. 4. Just write the number, no other symbols or variables, no spacing or comma. Problem: E = 0.36 kg, s = 20 kg, 95% confidence level
9. A researcher wants to construct a 99% confidence interval for the proportion of Americans who think that the U.S. invading Iraq was an effective step in combating world terrorism. She has no initial idea of what that proportion is. How large should her sample size be if she wants the margin of error to be at most two percent? Show or explain your thinking.
25. See photo

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