The article “Evaluation of Criteria for Setting Speed Limits on Gravel Roads” (S. Dissanayake, Journal of Transportation Engineering, 2011:57–63) counted the numbers of vehicles of various types on several roads in the state of Kansas. In Riley County, 13 out of 67 vehicles on Walsburg Road were heavy vehicles, while 32 out of 91 on North 52nd Street were heavy vehicles. Find a 90% confidence interval for the difference between the percentages of heavy vehicles on the two roads.

Q: 6) A survey of 500 non-fatal accidents showed that 201 involved the use of a cell phone. Construct a…

A: Here we need to construct a 99% confidence interval for the population proportion.

Q: In a study of the accuracy of fast food drive-through orders, McDonald’s had 35 orders that were not…

A: x be the number of number of orders that were not accurate from McDonald's and Burger king x1=35…

Q: if Two Populations 9) To compare the performance of students in private and public schools, samples…

A: For finding the Critical t-value. Since this is a two-tailed test with a significance level of 1%…

Q: According to the website www.collegedrinkingprevention.gov, "About 25 percent of college students…

A: Sample size (n) = 71Sample mean (x̅) = 3.93Standard deviations (s) = 3.78 Confidence level (c) =…

Q: 12) A sociologist develops a test to measure attitudes towards public transportation, and 27…

A:

Q: A poll of 827 students at Alpha state college found that 61% of those polled preferred a quarter…

A: It is given that the proportion of the students who preferred a quarter system to a trimester…

Q: In a Pew Research poll, 287 out of 522 randomly selected U.S. men were able to identify Egypt when…

A: Given that,287 out of 522 randomly selected U.S. men were able to identify Egypt.Whereas, 233 out of…

Q: ind a 95% confidence interval for the difference between the two proportions.   b) Is there a…

A: Let p1 and p2 be the two population proportions of people who said that it is serious.Given…

Q: A survey of 45,535 adults showed that 20,901 were very concerned abut climate change. What is the…

A: It is given asFavourable cases, x = 20901Sample size, n = 45535Confidence level = 99%

Q: Suppose we take a SRS of high school seniors and get a 95% confidence interval that 250 to 278…

A:

Q: A random sample of 5005 adults in a country includes 755 who do not use the Internet. Construct a…

A:

Q: study of 420,008 cell phone users found that 137 of them developed cancer of the brain or nervous…

A:

Q: 6) An Internet service provider sampled 590 customers and found that 85 of them experienced an…

A: According to the given information, we have Total number of customers = 590 85 of them experienced…

Q: A survey found that 39 of 66 people who don't drink coffee often have trouble sleeping and 44 of 88…

A: Solution: Let X1 be the number of noncoffee drinkers who have trouble sleeping, n1 be the sample…

Q: 2. Listed below are recorded speeds (in km/hr) of randomly selected cars travelling on a section of…

A: Null Hypothesis: A hypothesis which is tested for plausible rejection is called the Null Hypothesis…

Q: find the 99% confidence interval of the mean number of miles driven per day by all truckers

A: It is given that  Average = 540 Population standard deviation = 40 Sample size = 90

Q: A recent GSS reported that the 600 females had a mean of 7.5 close friends (a=8,4) and the 575 male…

A: The null and alternative hypotheses are   The test statistic is given by   p-value = 0.0131…

Q: In a survey conducted by a reputable marketing agency, 231 of 1000 adults 19 years of age or older…

A: Given Data Sample Size, n = 1000 Number of successes, x = 231.0 Significance…

Q: Listed below are student evaluation ratings of courses, where a rating of 5 is for "excellent." The…

A: The data is given as-x3.83.14.34.52.84.43.34.44.24.14.43.73.54.13.6

Q: A headline in USA Today proclaimed "Men and Women are equal talkers. Given below are the results of…

A: a)To test:H0:μ1=μ2H1:μ1≠μ2

Q: The pH of rain, measured at a weather station in Michigan, was observed for 39 consecutive rain…

A:

Q: An actuary is interested in estimating the proportion of young adults who plan to have children…

A: We need to construct the 99% confidence interval for the population proportion. We have been…

Q: a) Three confidence intervals were constructed using the same sample. Place these intervals in order…

A: The objective of the question is to understand the relationship between the width of a confidence…

Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.