According to Thomson Financial, last year the majority of companies reporting profits had beaten estimates. A sample of 149 companies showed that 105 beat estimates, 21 matched estimates, and 23 fell short. (a) What is the point estimate of the proportion that fell short of estimates? (Round your answer to four decimal places.) p = (b) At 95% confidence, determine the margin of error for the proportion that beat estimates. (Round your answer to four decimal places.) Provide a 95% confidence interval for the proportion that beat estimates. (Round your answers to four decimal places.) (c) How large a sample is needed if the desired margin of error is 0.05? (Round your answer up to the next integer.)
According to Thomson Financial, last year the majority of companies reporting profits had beaten estimates. A sample of 149 companies showed that 105 beat estimates, 21 matched estimates, and 23 fell short. (a) What is the point estimate of the proportion that fell short of estimates? (Round your answer to four decimal places.) p = (b) At 95% confidence, determine the margin of error for the proportion that beat estimates. (Round your answer to four decimal places.) Provide a 95% confidence interval for the proportion that beat estimates. (Round your answers to four decimal places.) (c) How large a sample is needed if the desired margin of error is 0.05? (Round your answer up to the next integer.)
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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According to Thomson Financial, last year the majority of companies reporting profits had beaten estimates. A sample of 149 companies showed that 105 beat estimates, 21 matched estimates, and 23 fell short.
(a)
What is the point estimate of the proportion that fell short of estimates? (Round your answer to four decimal places.)
p =
(b)
At 95% confidence, determine the margin of error for the proportion that beat estimates. (Round your answer to four decimal places.)
Provide a 95% confidence interval for the proportion that beat estimates. (Round your answers to four decimal places.)
(c)
How large a sample is needed if the desired margin of error is 0.05? (Round your answer up to the next integer.)
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