**Additional Problem:** In a Gallup Social Series Poll on Crime conducted last October with 691 female adults nationwide, it was found that 48% felt that crime in the area in which they live had increased over the last year. The margin of error for this poll was 3 percentage points. Would you claim that fewer than 50% of female adults believed that crime increased in the area in which they lived between October 2019 and October 2020?

Answered: Additional Problem: In a Gallup Social…

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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A credit score is used by credit agencies (such as mortgage companies and banks) to assess the creditworthiness of individuals. Values range from 300 to 850, with a credit score over 700 considered to be a quality credit risk. According to a survey, the mean credit score is 709.3. A credit analyst wondered whether high-income individuals (incomes in excess of $100,000 per year) had higher credit scores. He obtained a random sample of 31 high-income individuals and found the sample mean credit score to be 722 3 with a standard deviation of 81.1. Conduct the appropriate test to determine if high-income individuals have higher credit scores at the α=0.05 level of significance. State the null and alternative hypotheses. но-м 709.3 H₁ μ 709 3 (Type integers or decimals. Do not round.) Identify the t-statistic. = NEMO to = 89 (Round to two decimal places as needed.) Identify the P-value. P-value= (Round to three decimal places as needed.)
A credit score is used by credit agencies (such as mortgage companies and banks) to assess the creditworthiness of individuals. Values range from 300 to 850, with a credit score over 700 considered to be a quality credit risk. According to a survey, the mean credit score is 701.5. A credit analyst wondered whether high-income individuals (incomes in excess of $100,000 per year) had higher credit scores. He obtained a random sample of 38 high-income individuals and found the sample mean credit score to be 721.2 with a standard deviation of 84.5. Conduct the appropriate test to determine if high-income individuals have higher credit scores at the α=0.05 level of significance. State the null and alternative hypotheses. H0:μ ▼ greater than> not equals≠ equals= less than< nothing H1: μ ▼ greater than> less than< not equals≠ equals= ____
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A credit score is used by credit agencies (such as mortgage companies and banks) to assess the creditworthiness of individuals. Values range from 300 to 850, with a credit score over 700 considered to be a quality credit risk. According to a survey, the mean credit score is 703.7. A credit analyst wondered whether high-income individuals (incomes in excess of $100,000 per year) had higher credit scores. He obtained a random sample of 41 high-income individuals and found the sample mean credit score to be 715.6 with a standard deviation of 82.5. Conduct the appropriate test to determine if high-income individuals have higher credit scores at the a= 0.05 level of significance. State the null and alternative hypotheses. Hou H₁: H (Type integers or decimals. Do not round.) Identify the t-statistic. to = (Round to two decimal places as needed.) Identify the P-value.
Labor Day was created by the U.S. labor movement over 100 years ago. It was subsequently adopted by most states as an official holiday. In a poll by Gallup, 1000 randomly selected adults were asked whether they approve of labor unions; 650 said yes. In 1936, about 72% of Americans approved of labor unions. At a 5% level of significance, do the data provide sufficient evidence to conclude that the percentage of Americans who approve of labor unions now has decreased since 1936? Solve using the critical-value approach. Define the parameter we are testing and setup a hypothesis test to see if less than 72% of Americans approve of labor unions currently. Calculate the test statistics for this hypothesis test. What is the critical value for this hypothesis test?
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