1. provide the process of establishing confidence interval step by step. 2. According to past experience, 20% of students took public transportation. Test if the situation changed. Solve step by step
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A: Here use confidence interval for population proportion
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A: Level of significance ɑ=0.25
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Q: Find the confidence level and a for an 88% confidence interval.
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1. provide the process of establishing confidence interval step by step. 2. According to past experience, 20% of students took public transportation. Test if the situation changed. Solve step by step
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- Treating the 2015 Tobacco rate data as a sample, construct a 95% confidence interval for the mean tobacco rate for males and for females. Interpret each interval. Does it appear that males use tobacco at a higher rate than females? Justify your answer, using the confidence intervals in your explanation. Construct the same confidence interval for males at the 99% confidence level. Compare to the male 95% confidence interval from the previous question. What happened to the interval when the confidence level increased? Explain why. Prevalence of smoking any tobacco product among persons aged >= 15 years Male 2015 Prevalence of smoking any tobacco product among persons aged >= 15 years Female 2015 51.2 7.6 37.2 27.8 29.5 18.4 52.3 1.5 16.7 13.1 35.5 34.8 46.5 0.4 48.8 7.6 39.8 0.7 13.1 0.9 46.2 10.6 26.5 20 17.7 1 30.5 17.1 47.2 30 19.3 11.3 29.3 3.1 42.4 28.2 36 4.5 22.2 3.5 44.1 2.8…As a manager you want to know how likely is it that somebody who enters the store will purchase something. You asked one of your employees to check how many of the people who come to the store buy something. During one afternoon out of 280 people who entered the store 70 actually bought something. Find the sample probability of purchase. b. Find 90% confidence interval for the sample probability of purchase. Find 95% confidence interval for the sample probability of purchase. d. Find 99% confidence interval for the sample probability of purchase. e. Which of those confidence intervals is the widest and why? f. a. C. What if the lower bound of the confidence interval in this case would be below 0? TorWorksheet 1 Test and Cl for One Proportion Morgan Thomas Method p: event proportion Normal approximation method is used for this analysis. Descriptive Statistics N 10000 Worksheet 1 Test and Cl for One Proportion Morgan Thomas Method p: event proportion Normal approximation method is used for this analysis. Descriptive Statistics N 10000 Event 7549 Descriptive Statistics N 10000 Event 7549 Worksheet 1 Test and Cl for One Proportion Morgan Thomas Method p: event proportion Normal approximation method is used for this analysis. Event 7549 Sample p 0.754900 90% Cl for p (0.747825, 0.761975) Sample p 95% Cl for p 0.754900 (0.746469, 0.763331) Sample p 0.754900 99% Cl for p (0.743820, 0.765980)
- In a survey of 2343 adults, 700 say they believe in UFOs. Construct a 90%confidence interval for the population proportion of adults who believe in UFOs. Part 1 A 90% confidence interval for the population proportion is ( __, __ ) Interpret your results. Choose the correct answer below. A. The endpoints of the given confidence interval shows that 90% of adults believe in UFOs. B. With 90% confidence, it can be said that the population proportion of adults who believe in UFOs is between the endpoints of the given confidence interval. C. With 90% confidence, it can be said that the sample proportion of adults who believe in UFOs is between the endpoints of the given confidence interval. D. With 90% probability, the population proportion of adults who do not believe in UFOs is between the endpoints of the given confidence interval.A confidence interval for a population mean has length 24. a. Determine the margin of error. b. If the sample mean is 50, obtain the confidence interval. c. Construct a graph that illustrates your results.In a survey of 3078 adults, 1410 say they have started paying bills online in the last year. Construct a 99% confidence interval for the population proportion. Interpret the results. Interpret your results. Choose the correct answer below. A. The endpoints of the given confidence interval show that adults pay bills online 99% of the time. B. With 99% confidence, it can be said that the sample proportion of adults who say they have started paying bills online in the last year is between the endpoints of the given confidence interval. C. With 99% confidence, it can be said that the population proportion of adults who say they have started paying bills online in the last year is between the endpoints of the given confidence interval.
- Siblings Mary and David are each attempting to estimate the proportion of families in their neighborhood who have five or more children. Mary selects a random sample of 50 families to survey, and she observes a sample proportion of 0.10. David selects a random sample of 100 families to survey, and he also observes a sample proportion of 0.10. Mary and David each use their sample data to construct a 95% confidence interval. Who will have the more narrow confidence interval? A. Both intervals will have the same width since the sample proportions are the same. B. Both intervals will have the same width since the level of confidence is the same for each interval. C. Both intervals will have the same width since the sample proportions are the same and the level of confidence is the same for each interval. D. Mary's interval will be more narrow than David's interval. E. David's interval will be more narrow than Mary's interval.Debbie and Ethan are going to construct confidence intervals from the same simple random sample. Debbie's confidence interval will have a 98% confidence interval and Ethan's will have a 95% confidence interval. A. Which confidence interval, if there is a difference will have a larger margin of error? B. Which confidence interval is more likely to cover the population mean, if there is a difference I am using a Ti84 and need to know how to get the answer.Suppose you construct a 90% confidence interval for the true population mean GPA of students at Taft College. If all of the sample values remained constant and you decreased the confidence level, what would happen to the width of your confidence interval? Edit View Incort
- View both photos attached and answer the question below. Estimate the net sale in future promotions, 95% confidence intervals for the population means were constructed. See output below. Explain and compare the confidence interval for net sales for Promotional and Regular customers. Make sure to clearly describe the confidence intervals in the context of the problem.A. Suppose we wish to make an estimate of the proportion of the population that has ever been arrested. We take a random sample of 500 people. In this sample, 10% of the respondents report having ever been arrested. Construct a 95% confidence interval for the proportion of people in the population who have been arrested. 2. Interpret, in words, the meaning of this interval.Offline Activity: Solve the following. Interpret the resulting data. 1. A consumer watch group interviewed a random sample of 1000 consumers and asked them if they are optimistic about the economy or not. There were 612 who said Yes. Use a 95% confidence level to estimate the population proportions. 2. A nutritionist wants to know the population proportion of Grade 1 learners who eat vegetables. Pegged at a confidence of 95%, a survey among 1200 respondents was conducted and 200 said that they eat vegetables.
