Listed below are six randomly selected heights of women and men from a recent epidemiological study . Men u_{1} Women 160 168 167 153 160 177 190 170180 180 177 179 u_{2} Use a 5% significance level to test the claim that women have heights with a mean that is the same as the mean height of men. If you find evidence that the claim is true, follow up with an appropriate confidence interval and interpretation.
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Listed below are six randomly selected heights of women and men from a recent epidemiological study . Men u_{1} Women 160 168 167 153 160 177 190 170180 180 177 179 u_{2} Use a 5% significance level to test the claim that women have heights with a
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- What percentage of Contra Costa County adults supports a ban on assault-style weapons? Suppose that we survey a random sample of 100 adults living in Contra Costa County and find that 62% support a ban on assault-style weapons.According to a 2015 study by the Pew Research Center, 57% of U.S. adults favor a ban on assault-style weapons. Assuming that the variability in random samples will be the same in Contra Costa County as in the U.S., find the 95% confidence interval to estimate the proportion of CCC g.Are we confident that the percentage of Contra Costa County residents that supports a ban is greater than the percentage nationwide as reported by the Pew Research Center? Why or why not?What percentage of Contra Costa County adults supports a ban on assault-style weapons? Suppose that we survey a random sample of 100 adults living in Contra Costa County and find that 62% support a ban on assault-style weapons. According to a 2015 study by the Pew Research Center, 57% of U.S. adults favor a ban on assault-style weapons. Assuming that the variability in random samples will be the same in Contra Costa County as in the U.S., find the 95% confidence interval to estimate the proportion of CCC adults that favor a ban on assault-style weapons. g. Are we confident that the percentage of Contra Costa County residents that supports a ban is greater than the percentage nationwide as reported by the Pew Research Center? Why or why not?What percentage of Contra Costa County adults supports a ban on assault-style weapons? Suppose that we survey a random sample of 100 adults living in Contra Costa County and find that 62% support a ban on assault-style weapons. According to a 2015 study by the Pew Research Center, 57% of U.S. adults favor a ban on assault-style weapons. Assuming that the variability in random samples will be the same in Contra Costa County as in the U.S., find the 95% confidence interval to estimate the proportion of CCC adults that favor a ban on assault-style weapons. d.Find the 95% confidence interval for Contra Costa e.Write a sentence to interpret the interval f.Are we confident that the majority of Contra Costa County residents support a ban on assault-styleweapons? Why or why not? g.Are we confident that the percentage of Contra Costa County residents that supports a ban is greater than the percentage nationwide as reported by the Pew Research Center? Why or why not?
- In a survey of 1600 U.S. adults, 1280 said that it is acceptable to check personal e-mail while at work. Using the conventional method (i.e. one-sample z procedure), what is the 90% confidence interval for the population proportion of the U.S. adults who say that it is acceptable to check personal e-mail while at work? Choose from available letters. a. (0.63, 0.67) b. (0.78, 0.82) c. (0.75, 0.95)A gardener is testing a new type of carrot. From a sample of 15 carrots, she calculates a mean length of 7.2 inches and standard deviation of 1.23 inches. Find a 95% confidence interval for the mean length of this new type of carrot.Results from the National Health and Nutrition Examination Survey (NHANES) conducted thirty years ago revealed that out of 378 randomly selected adults in the United States 57 were considered to be obese. In this year’s National Health and Nutrition Examination Survey, out of 426randomly selected adults in the United States 135 were considered to be obese. Use the results of the National Health and Nutrition Examination Survey and a 99% confidence interval to estimate the difference between the percentages of adults in the United States that are obese this year and thirty years ago. Express the estimate both symbolically and verbally.
- A company director investigated whether there is a difference in the mean number of overtime hours worked each week by employees assigned to two different managers. Each manager, A and B, manages 100 employees. Random samples of 35 employees from manager A and 40 employees from manager B were selected. The number of overtime hours worked was recorded for the 75 employees each week. Have the conditions been met for inference with a confidence interval for the difference in the population means? Yes, all conditions have been met. No, because the data were not collected using a random method. No, because the size of at least one of the samples is greater than 10 percent of the population. No, because the sample sizes are not large enough to assume the distribution of the difference in sample means is normal. No, because the sample sizes are not the same.A company director investigated whether there is a difference in the mean number of overtime hours worked each week by employees assigned to two different managers. Each manager, A and B, manages 100 employees. Random samples of 35 employees from manager A and 40 employees from manager B were selected. The number of overtime hours worked was recorded for the 75 employees each week. Have the conditions been met for inference with a confidence interval for the difference in the population means? Yes, all conditions have been met. A No, because the data were not collected using a random method. B No, because the size of at least one of the samples is greater than 10 percent of the population. C No, because the sample sizes are not large enough to assume the distribution of the difference in sample means is normal. D No, because the sample sizes are not the same. EA lamp manufacturer company tests the 2 new models of LED spotlights for commercial use trying to decide between 2 models.At the moment, the shelf life tests are carried out as shown in the table.Perform a one-sample one-way ANOVA test to compare lifespan between focus models with a 95% confidence level.
- According to a study of political prisoners, the mean duration of imprisonment for 31 prisoners with chronic post-traumatic stress disorder (PTSD) was 33.3 months. Assuming that σ=44 months, determine a 90% confidence interval for the mean duration of imprisonment, μ, of all political prisoners with chronic PTSD.An opinion poll asks an SRS of 100 college seniors how they view their job prospects. In all, 54 say “Good.” Calculate a large-sample 95% confidence interval for estimating the proportion of all college seniors who think their job prospects are good.A sample of 82 Oscar-winning actresses had a mean age of 35.9 years when they won the award. s = 11.1 years. Use a 0.01 significance level to test the claim that the mean age of actresses when they win an Oscar is greater than 33 years. Once you have your conclusion, find the 99% confidence interval of the mean age and compare your results.