The utility company wishes to estimate the percentage of people in the US who use electricity to heat their homes.Past data indicate that 22% of customers surveyed used electricity to heat their homes. If the company wishes to be95% confident to within 3%, how large a sample would be neededesc1732733827520alt9aN$%JAAAA8A086452W→SX#3eCdCrfVt6.0Ollgb4yh&7OnujO3ik94OValtOрVctrl{[?||}backsp1

Given thatProportion (p)=0.22Margin of error (E)= 0.03At 95% confidence interval we have to find…

Answered: The utility company wishes to estimate…

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 you plan to conduct among 2,500 Grade 12 students enrolled in the stem Track. How many respondents are needed if your study is at 95% level of confidence?
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The state education commission wants to estimate the fraction of tenth grade students that have reading skills at or below the eighth grade level. Step 1 of 2: Suppose a sample of 333 tenth graders is drawn. Of the students sampled, 260 read above the eighth grade level. Using the data, estimate the proportion of tenth graders reading at or below the eighth grade level. Enter your answer as a fraction or a decimal number rounded to three decimal places. Step 2 of 2: Suppose a sample of 333 tenth graders is drawn. Of the students sampled, 260 read above the eighth grade level. Using the data, construct the 80% confidence interval for the population proportion of tenth graders reading at or below the eighth grade level. Round your answers to three decimal places.
According to an article in Newsweek, the natural ratio of girls to boys is 100:108. In Turkey, the birth ratio is 100: 118 (45.8% girls). Suppose you do not believe the reported figures of the percent of girls born in Turkey. You conduct a study. In this study, you count the number of girls and boys born in 140 randomly chosen recent births. There are 50 girls and 90 boys born of the 140. Based on your study, do you believe that the percent of girls born in Turkey is 45.8?
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