advance.a. What sample size do you recommend that they use in all their future surveys to achieve at least theb. What sample size do you recommend if you can assume that the true proportion is between 0.20c. What sample size do you recommend if you can assume that the true proportion is between 0.60and 0.85?6.5 The production employees at a garment factory have been surveyed several times to determine theproportion of employees who are opposed to a union. The estimates of this proportion ranged from60% to 80%. The management agrees that they want a 90% confidence interval estimate with ahalf-width of 2%. What sample size should they use?91

By Using the margin of error to calculate the required sample size

Answered: and 0.85? 6.5 The production employees…

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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You want to survey students to see what proportion of them have taken Statistics 101. This survey hasn't been previously completed, so no estimate is known. How large of a sample size is necessary if we want the margin of error to be within 4% with a 95% confidence interval?
2. A Bootstrap Dotplot with 1000 samples for the correlation between commute time and commute distance in Atlanta is shown below. Find a 99% confidence interval by hand, using the percentiles method. 40 30 20 10 0 0.65 Left Tall Two Tailight Tail a. How many 0.70 0.75 0.80 dots did you count in each tail? b. Give your confidence interval here: c. Interpret the confidence interval in context. 0.85 samples-1000 0.90
A recent poll of 960 Facebook users posed the following question: "Thinking just about your Facebook profile, how many friends do you currently have in your network?" The pie chart below represents their responses. The margin of error is 3.2% 1. What is the population represented here? 2. What is the sample? 3. Calculate the confidence interval for those who have 101-250 friends. 4. Interpret the confidence interval for this poll in a meaningful sentence for those who have 101 - 250 friends. Remember to include the margin of error provided is 95% certain. 5. Calculate the confidence interval for those who have 1 - 100 friends. 6. Interpret the confidence interval for this poll in a meaningful sentence for those who have 1 - 100 friends. Remember to include the margin of error provided is 95% certain.
Suppose the Statistics Department at TAMU wants to create a confidence interval for the proportion of students that get an A in Stat 303 this semester. In past semesters, the proportion has been around 0.50 (50%). The department wants an interval with a confidence level of 99% and a margin of error of 0.05. What sample size should they use? 1557 798 1121 664 It is impossible to determine.
9 Next TWO questions are related to the following sample data: Jane, a statistics student, wants to build a confidence interval with a 95% confidence level for the mean commuting distance of all IUPUI students. She selects a random sample of students and obtains the following commuting distance data. The data show the distance from the student residence to the campus in miles). b C d 11 b 8:19 1 d Done 12 8.6 23 8.3 9.1 22.6 8.2 14 12.3 14.9 9.4 16.5 12.7 14.9 0.395 0.359 0.326 19 48 10.2 10.7 4.7 14.4 20.1 28.5 29.6 18 7.5 13.1 16 12.4 17.3 16.7 11.9 61 71 83 97 The standard error of the mean is, 0.434 14.93 14.59 E270 T5 Armour, Tori.xlsx 14.24 13.67 29 38 31 39 10.8 20.9 13.5 17.9 11.1 35.4 34.1 33.0 31.9 13 13.2 10.1 14.1 12.6 11.5 12.2 13.2 14.7 19.7 19.3 38 26 30 12.9 14.7 17.4 13.1 12.8 10.9 10.3 21.2 7.6 8.2 The confidence interval with a 95% confidence level is 26.1 27.4 10 The interval estimate is, 11.83 12.18 12.52 13.10 Next two questions are related to the following sample…
2.10 You and your friend declde to construct 95% confidence intervals for a given population mean. You wind up taking a sample of 49 random observations while your friend's sample Is made up of 36 random observations. Which of the following is true? a. The total width of your confidence interval estimate is wider b. Your friend's interval has a greater degree of confidence C. The total width of your confidence interval estimate is narrower d. Your interval has a greater degree of confidence Calculations: 2.11 The width of a confidence Interval for a proportion will be: a. wider for a sample of size 100 than for a sample of size 50 b. wider for 90% confidence than for 95% confidence C. narrower for 99% confidence than for 95% confidence d. wider when the sample proportion is 0.50 than when the sample proportion is 0.20 Calculations 2.12 A sample of 50 students was taken from the local university. These students spent an average of R170 on books this semester, with a standard devation of…
The mean number of sick days an employee takes per year is believed to be about ten. Members of a personnel department do not believe this figure. They randomly survey eight employees. The number of sick days they took for the past year are as follows: 12; 4; 15; 3; 11; 8; 6; 8. Let x = the number of sick days they took for the past year. Construct a 95% confidence interval for the true mean or proportion. Round to the nearest hundredth (2 decimal places).
Tina catches a 14-pound bass. She does not know the population mean or standard deviation. So she takes a sample of five friends and they say the last bass they caught was 9, 12, 13, 10, and 10 pounds. Find the t and calculate a 95% (α = .05) confidence interval.
Need help with this question. Thank you :)
I think the answer to this last part is C
When constructing a 90% confidence interval around a sample mean, how many samples out of 100 would you expect to not include the true population mean within their confidence intervals? a. 5 b. 1 c. 0 d. 10
Which store do you think is more expensive—physical or online? A recent survey found that 45% of people aged 20 to 40 thought that physical stores were more expensive. To conduct a follow-up study that would provide 95% confidence that the point estimate is correct to within 0.05 of the population proportion, how many people aged 20 to 40 need to be sampled? (PHStat) To conduct a follow-up study that would provide 99% confidence that the point estimate is correct to within 0.05 of the population proportion, how many people aged 20 to 40 need to be sampled? (PHStat) Compare the results of (a) and (b).

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