22. A political poll immediately prior to a congressional election reveals that 145 outof 250 male voters and 105 out of 200 female voters intend to vote for theDemocrat candidate.a) Can we infer at the 5% significance level that the proportion of male and femalevoters who intend to vote for the Democrat candidate differ? Perform 6 stepHypothesis testb) Estimate with 95% confidence the difference in the proportion of male and femalevoters who intend to vote for the Democrat candidate.misk

Given that: For male voters: x1=145n1=250 For female voters: x2=105n2=200 Level of significance,…

Answered: 22. A political poll immediately prior…

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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8. Travel to Outer Space ACBS News/New York Times poll found that 329 out of 763 adults said they would travel to outer space in their lifetime, given the chance. Estimate the true proportion of adults who would like to travel to outer space with 92% confidence.
On election day, a local TV news organization stayed at three polling locations in Fairfield county and asked voters whether they voted for candidate A in the election for the US Senate seat. The ’yes’ responses they got were 520 out of 945, 475 out of 865, and 485 out of 980 in the three different locations. They aggregated the sample data into 1480 out of 2790 and after the 8pm close of the election reported their sample results to viewers. a) Go through the steps of a significance test to determine whether or not candidate A won the election. b) Based on the above sample data, at 8:01pm the news organization reported their estimate of the percentage of votes candidate A received and the margin of error of their poll. Calculate these numbers. They then aired their prediction that candidate A won the election. Discuss any concerns you have with their decision to report their prediction.
he North American Free Trade Agreement (NAFTA) enacted in 1994 is a trilateral trade agreement signed by the United States, Canada and Mexico. This trade agreement has been controversial since its inception and Americans remain split on the issue. In a Gallup Poll conducted February 1-5, 2017, 420 out of 912 randomly selected Americans aged 18 or older stated that they believed that NAFTA was bad for the United States. Find the point estimate for the proportion of Americans who believe that NAFTA was bad for the United States. Round your answer to 4 decimal places. Find the margin of error for a 95% confidence interval. Round your answer to 4 decimal places. Construct the 95% confidence interval for the proportion of Americans who believe that NAFTA was bad for the United States. Enter your answer as an open interval of the form (a,b) and round to 3 decimal places. Can you conclude that more than half of Americans believe that NAFTA was bad for the United States? No conclusions can…
b) A test of 80 youths and 120 adults showed that 18 of the youths and 10 of the adults were careless drivers. Use a 1% level of significance to test the claim that youth percentage of careless drivers is higher than the adult percentage
A researcher asks random samples of residents of two separate counties as to whether they had purchased organically grown food in the last three months. He wants to determine whether the proportion of residents of one county who purchase organically grown food is greater than the proportion of residents of the second county who purchase organically grown food. Choose the appropriate test and name the population(s). a) Two-proportion z-test; one population is all adults who buy organically grown food and the other population is all adults who do not buy organically grown food. b) Two-proportion z-test; one population is all residents of the first county and the other population is residents of the second county. c) One-proportion z-test; the population is all residents of a state. d) One-proportion z-test; the population is all residents of the first county.
The Boeing Company wants to investigate the fuel consumption of all flights of the company. For this purpose, the company selects all flights (of Boeing) from UK to USA. a) Clearly define the population and sample of this study. b) Clearly define an appropriate parameter and statistic for this study. c) Discuss the representativeness of the sample. ***The answer should be very detailed and clear, THANK YOU!!!
5. In a pre-election poll, a pollster finds that 552 out of 1025 people polled favor Smith. Construct the 95% confidence interval for the proportion of people in the whole population who favor Smith.
40. Politics and sex One month before the election, a poll of 630 randomly selected voters showed 54% planning to vote for a certain candidate. A week later, it became known that he had had an extramarital affair, and a new poll showed only 51% of 1010 voters supporting him. Do these results indicate a decrease in voter support for his candidacy? a) Test an appropriate hypothesis and state your conclusion. b) If you concluded there was a difference, estimate that differ- ence with a confidence interval and interpret your interval in context.
To investigate if female executives in a very large fortune 500 company are experiencing pay-discrimination: A researcher samples the incomes of 300 male and 300 female executives from that corporation. 1.) Which statistic would you use to test the income difference between male and female executives? 2.) What additional information do you need to calculate this statistic?
A survey of 2255 randomly selected US adults found that 51% said they know all or most of their neighbors. Does this provide evidence that more than half of US adults know most or all of their neighbors? Use 5% significance level.
Joe Biden (Democrat) will be running for President of the United States in 2020. His campaign is continually, among other things, wanting to estimate the percentage of Americans who will vote for him. a) How many Americans should be sampled to estimate the percentage of those who will vote for Joe Biden if his campaign wants to be 95% confident that the margin of error is no more than 2%? The last poll found that 49% of Americans said they will vote for Biden.
Past studies have indicated that the percentage of smokers was estimated to be about 34%. Given the new smoking cessation programs that have been implemented, you now believe that the percentage of smokers has reduced. You randomly surveyed 1807 people and found that 574 smoke. Use a 0.05 significance level to test the claim that the percentage of smokers has reduced. a) Identify the null and alternative hypotheses? Но: ? H1: ? v b) What type of hypothesis test should you conduct (left-, right-, or two-tailed)? O left-tailed O right-tailed O two-tailed c) Identify the appropriate significance level. d) Calculate your test statistic. Write the result below, and be sure to round your final answer to two decimal places. e) Calculate your p-value. Write the result below, and be sure to round your final answer to four decimal places. f) Do you reject the null hypothesis? O We reject the null hypothesis, since the p-value is less than the significance level. O We reject the null hypothesis,…

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