12. Which of the following would indicate that a dataset is not bell- a) The range is larger than the interquartile range. b) The range is equal to 5 standard deviations. c) There are no outliers. d) The mean is much smaller than the median.
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- A national opinion poll found that 44% of all American adults agree that parents should be given vouchers that can be applied toward their children's education at any public or private school of their choice. The result was based on a small sample. A)How large an SRS is required to obtain a margin of error of at most 0.03 in a 99% confidence interval? B) Answer the question in part A again but this time By using Phat=0.5. By how much do the two sample size differ?The Marist Poll published a report stating that 66% of adults nationally think licensed drivers should be required to retake their road test once they reach 65 years of age. It was also reported that interviews were conducted on 1,018 American adults, and that the margin of error was 3% using a 95% confidence level. (a) How large the size of a sample needs to be if we want to a 90% confidence level with a margin of error no more than 1.5%?(b) Conduct a hypothesis testing of whether over 60% of the population thought that licensed drivers should be required to retake their road test once they turn 65? That is, test the hypotheses H0: p = 0.6 and Ha: p > 0.6, where p is proportion of American adults that thought licensed drivers should be required to retake their road test once they turn 65. Please report the test statistic and the P-value, and make a conclusion using a 0.01 significance level.1. Does the data provide convincing evidence that the true mean body temperature in all healthy 18-40 year-olds is not 98.6 F? 2. A 95% confidence interval for the population mean is 98.123 F to 98.377 F. Explain how the confidence interval is consistent with, but gives more information than, the significance test in the previous question.
- 3.Michael wants to make a confidence interval estimate for the proportion of community members in favor of a tax increase for more local school funding. If he wants the margin of error to be no more than 0.025 at a 90% confidence level, a)What is the required sample size required to obtain the desired margin of errorFor a two-tailed hypothesis test at the significance level α,the null hypothesis H0: μ=μ0 will be rejected in favor of the alternative hypothesis Ha: μ≠μ0 if and only if μ0 lies outside the (1−α)-level confidence interval for μ. Illustrate the preceding relationship by obtaining the appropriate one-mean t-interval for the summary statistics provided. Complete parts (a) and (b). According to a survey, the average person watched 4.35 hours of television per day in 2005. A random sample of 20 people were asked for the number of hours of television watched per day for last year. At the 10% significance level, the data do not provide sufficient evidence to conclude that the amount of television watched per day last year by the average person differed from that in 2005. (Note: x=4.752 hours and= s=2.384 hours.) The confidence interval is (Round to three decimal places as needed.) According to a national study the average consumer unit spent $1739 on apparel and services…The National Weight Control Registry tries to mine secrets of success from people who lost at least 30 pounds and kept it off for at least a year. It reports that out of 2,720 registrants, 439 were on a low-carbohydrate diet (less than 90 grams a day). a. Develop a 95% confidence interval for the proportion of people on a low-carbohydrate diet.b. Is it possible that the population percentage is 16%? c. How large a sample is needed to estimate the proportion within 0.55%?
- The Okeechobee County Economic Development Board needs to estimate the proportion of all county residents who have earned at least a bachelor's degree. A random sample conducted by the Okeechobee County Economic Development Board found that 10.5% of all county residents held at least a bachelor's degree.Find three different confidence intervals - one with sample size 180, one with sample size 451, and one with sample size 621. Assume that 10.5% of the county residents in each sample have earned at least a bachelor's degree. Notice how the sample size affects the margin of error and the width of the interval.Report confidence interval solutions using interval notation. Report all solutions in percent form, rounded to two decimal places, if necessary. When n=180n=180, the margin of error for a 95% confidence interval is given by .When n=180n=180, a 95% confidence interval is given by . When n=451n=451, the margin of error for a 95% confidence interval is given by .When n=451n=451, a…22 this question has part a and b Since ? = 100 ---Select--- falls or does not fall in the confidence interval, it is ---Select--- unlikely or likely that the mean DL reading for current smokers is greater than or equal to 100 DL. This ---Select--- disagrees or agrees with the conclusion from part (a).21 this question has part a,b, and c Based on the confidence interval, the quality control department ---Select--- should or should not be concerned. Since 1 is ---Select--- contained in, below, above the interval, the interval ---Select--- suggests or does not suggest that ? is different from 1.
- If 25 falls inside the confidence interval, then you would fail to reject the null hypothesis and conclude there is insufficient evidence that true mean time spent on the graduation projects is significantly different than 25 hours?2. A marketing research company desires to know the mean consumption of milk per week among males over age 27. They believe that the milk consumption has a mean of 3.3 liters and want to construct a 80% confidence interval with a maximum error of 0.08 liters. Assuming a standard deviation of 0.9 liters, what is the minimum number of males over age 27 they must include in their sample? Round your answer up to the next integer.A 90 percent confidence interval is to be created to estimate the proportion of television viewers in a certain areawho favor moving the broadcast of the late weeknight news to an hour earlier than it is currently. Initially, theconfidence interval will be created using a simple random sample of 9,000 viewers in the area. Assuming that thesample proportion does not change, what would be the relationship between the width of the original confidenceinterval and the width of a second 90 percent confidence interval that is created based on a sample of only 1,000viewers in the area?(A) The second confidence interval would be 9 times as wide as the original confidence interval.(B) The second confidence interval would be 3 times as wide as the original confidence interval.(C) The width of the second confidence interval would be equal to the width of the original confidence interval.(D) The second confidence interval would be 1/3 as wide as the original confidence interval.(E) The second…