Name:Statistics1. An investigative reporter contacts a random sample of hotels, and finds a 95% confidenceinterval for the proportion of hotels in the United States that have reported having bedbugs is(0.04, 0.11).a. Interpret this confidence interval in context.F380b. A national hospitality organization had reported that only 5% of hotels have experiencedproblems with bedbugs. Does this reporter have compelling evidence that the trueproportion is really higher? Explain.c. How could the reporter estimate this proportion with a smaller margin of error?a. Identify the parameter, p,2. To estimate how often someone runs a red light in Cyber City, a student watched traffic for awhile at several randomly selected intersections. Drivers ran the red light during 43 of 240light changes she observed.QOPeriod:Quiz (ch 16+17)F49F5Page 1 / 2cF68+F7Date::DIIF8DDF9

The objective of the question is to interpret the confidence interval, evaluate the evidence against…

Answered: Name: Statistics 1. An investigative…

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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Need asap. A magazine article conducted a survey of 1000 people in Washington State and found that 26% of the population believe that Mount Saint Helens will have a repeat erruption this year. In the accompanying dialogue, the article states, we are 90% confident that the true proportion of people in Washington State who believe that Mount Saint Helens will have a repeat erruption this year lies between 23% and 29% . What does 90% represent in the article?A. a confidence intervalB. a confidence levelC. a margin of errorD. a statisticE. a parameter
In a survey, 1000 Grade 7 students were asked if they read storybooks. There were 318 who said Yes. Use 95% confidence interval to determine the population proportion p of all Grade 7 students who read storybooks.a. 29%-35%b. 28%-36%c. 30%-34%
1. You have recently had a debate with a friend about who uses smartphones the most. Your friend believes that men use smartphones more than women. After conducting a research study you find that out of 973 randomly sampled men, 379 use smartphones. Out of 1,304 randomly sampled women, 404 used smartphones. Based on a 95% confidence level, after hypothesis testing, what would you tell your friend? a. Which test will you use to test for this statistical analysis? b.State the null and alternative hypothesis: i.H0: ii.Ha c.What is the value of the test statistic?
According to a recent random survey of 3,728 US adults, 1,939 report using their cell phones to play online games. Construct and interpret a 95% confidence interval for the proportion of US adults who use their cell phones to play online games. State: confidence interval for the true proportion of US adults who use their cell phones to play online games. Plan: ; Random: Random survey; 10%: 3,728 is less than 10% of all US adults; Large Counts: 1,939 successes and 1,789 failures ≥ 10. Do: Conclude: We are 95% confident that the interval from includes the true proportion of all US adults to play online games.
Estimate the 95% confidence interval for the proportion of iPhone (Apple Inc.) users in your sample of 370 students. Briefly interpret your answer. Sample Proportion (in percentage form) Apple 72.70% Samsung 16.76% LG 1.35% Basic mobile phone 0.54% Other smartphone 8.65% Do not use mobile phone 0%
B. Identify the value of the margin of error E C. Construct the confidence interval There are 3 part to this question. Other two questions are above.
Mental health. The General Social Survey asked the question: “For how many days during the past30 days was your mental health, which includes stress, depression, and problems with emotions, not good?”Based on responses from 1,151 US residents, the survey reported a 95% confidence interval of 3.40 to 4.24days in 2010.(a) Interpret this interval in context of the data.(b) What does “95% confident” mean? Explain in the context of the application.(c) Suppose the researchers think a 99% confidence level would be more appropriate for this interval. Willthis new interval be smaller or wider than the 95% confidence interval?(d) If a new survey were to be done with 500 Americans, do you think the standard error of the estimatebe larger, smaller, or about the same.
Construct a 95% confidence interval for p1 - p2 for a survey that finds 30% of 240 males and 41% of 200 females are opposed to the death penalty. Group of answer choices a.(-0.200, -0.021) b.(-1.532, 1.342) c.(-1.324, 1.512) d.(-0.561, 0.651)
Suppose you want to construct an 80% confidence interval for the proportion of businesses that provide incentives to their workers. Ifyou want a marginof error of 3.5%, how many business entities must you survey?
A random sample of 40 12th-grade students was asked how long it took to get to school. The sample mean was 15.5 minutes and the sample standard deviation was 12.7 minutes. a. Find a 95% confidence interval for the population mean time it takes 12th-grade students to get to school. b. Would a 90% confidence interval based on this sample data be wider or narrower than the 95% confidence interval? Explain. Check your answer by constructing a 90% confidence interval and comparing the width of the interval with the width of the 95% confidence interval you found in part (a). a. The 95% confidence interval is from minutes to minutes. (Round to two decimal places as needed. Use ascending order.) b. Would a 90% confidence interval based on this sample be wider or narrower than the 95% confidence interval? O A. The 90% interval is wider because it has a lower confidence level, and therefore uses a smaller critical value, which creates a wider interval. O B. The 90% interval is wider because it…
Find the confidence level and α for a. a 90% confidence interval. b. a 99% confidence interval.
A political scientist claims that 38% of first-year college students characterize themselves as being “moderate” or “middle of the road” as far as their political affiliation is concerned. Believing this claimed value is too high, you survey a random sample of 400 first-year college students and find that 120 characterize themselves as being “moderate” or “middle of the road.” Based on this information, what will the test statistic be? Choose the answer below that is closest to what you calculate, and try not to do a lot of rounding until you get to the very end of your calculations. 1. -0.3 2. -1.2 3. -2.6 4. -3.3 5. None of the other answer options are correct because the test statistic should be positive, not negative.

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