A mayor claims that the unemployment rate in his city is 5 %. Many people think...
A mayor claims that the unemployment rate in his city is 5 %. Many people think that the unemployment rate is higher. So, 85 residents of the city are contacted and it is found that 7 of them are unemployed. Can the mayor’s claim be supported to a level of significance of α = .03, test the hypothesis.
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A mayor claims that the unemployment rate in his city is 5 %.
Many people think...
The mayor of a large city claims that 25% of the families in the city earn...
The mayor of a large city claims that 25% of the families in the city earn more than $ 100,000 per year; 55% earn between $ 30,000 and $ 100,000 (inclusive); 20 % earn less than $ 30,000 per year. In order to test the mayor's claim, 285 families from the city are surveyed and it is found that: 80 of the families earn more than $ 100,000 per year; 140 of the families earn between $ 30,000 and $...
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A survey of 1385 people who took trips revealed that 117 of them included a visit...
A survey of 1385 people who took trips revealed that 117 of them included a visit to a theme park. Based on those survey results, a management consultant claims that less than 9 % of trips include a theme park visit. Test this claim using the α=0.05 significance level. I have found the test statistic value (-.718221) but I'm not sure how to calculate critical value on paper or with a calculator.
The accuracy of a census report on a city in southern California was questioned by some...
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The CEO of a large electric utility claims that 80 percent of his 1,000,000 customers are very satisfied with the service they receive. To test this claim, the local newspaper surveyed 100 customers using simple random sampling to determine if the proportion differs from 80%. Among the sampled customers, 73 say they are very satisfied. Based on these findings, can we reject the CEO's hypothesis that 80% of the customers are very satisfied? Use a 0.05 level of significance. a)...
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Suppose across all cities in Florida, the proportion of people young adults (ages 20 to 30) who have attended a roller derby match is 0.28. Tyree believes that the proportion of young adults in his city who have attended a roller derby match is greater than the state population proportion. He decides to test this idea using a one-sample z-test for a population proportion using a significance level of α-0. 1 0 He conducts a survey of 225 randomly selected...
5. I took a random sample of people from the 2000 U.S. Census and recorded the...
5. I took a random sample of people from the 2000 U.S. Census and recorded the incomes. The sample size was n = 30 (with replacement). The average of the sample was $23606 and the standard deviation of the sample was $24757. Answer these questions using the statistics that I found from my sample. a) Find a 95% confidence interval for the mean income of the population. b) What assumptions must you make? c) Your confidence interval is of the...
The mayor of a large city claims that 25% of the families in the city earn more than $ 100,000 per year; 55% earn between $ 30,000 and $ 100,000 (inclusive); 20 % earn less than $ 30,000 per year. In order to test the mayor's claim, 285 families from the city are surveyed and it is found that: 80 of the families earn more than $ 100,000 per year; 140 of the families earn between $ 30,000 and $...
Suppose across all cities in Florida, the proportion of people young adults (ages 20 to 30) who have attended a roller derby match is 0.28. Tyree believes that the proportion of young adults in his city who have attended a roller derby match is greater than the state population proportion. He decides to test this idea using a one-sample z-test for a population proportion using a significance level of α-0. 1 0 He conducts a survey of 225 randomly selected...
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