With 95% confidence the authors of the report are claiming that the true average length of a motor vehicle trip in the United States is between  and  miles.

Q: The CEO of a company wants to estimate the percent of employees that use company computers to go on…

A: From the provided information, Sample size (n) = 150 60 of them logged Facebook that day that is x =…

Q: A survey found that 73% of a random sample of 8344 American adults approved of cloning endangering…

A:

Q: a previous analysis of paper boxes showed that the standard deviation of their lengths is 13…

A: It is given that confidence level is 0.95, standard deviation is 13 and margin of error E is 4.Here,

Q: In 2011 the U.S. Department of Transportation reported with 95% confidence that the average length…

A: Given    alpha=0.05, Xbar=9.72, MOE=0.22

Q: For an educational study, a volunteer must place in the middle 50% on a test. If the mean for the…

A:

Q: To test whether the failure rate of an exam is the same for both males and females, researchers…

A: Based on confidence interval we have to conclude about the difference between means if it's same or…

Q: A firm having 4000 employees took a random sample of 25 in order to estimate their average annual…

A: Note that the population standard deviation is unknown here. Hence, it is appropriate to use t…

Q: In 2011 the U.S. Department of Transportation reported with 95% confidence that the average length…

A: Solution: Given information: x= 9.72 miles Sample mean  Margin of error = E= 0.22 miles

Q: In 2011 the U.S. Department of Transportation reported with 95% confidence that the average length…

A: Given ,Point estimate =  =9.72 Margin of error = 0.22

Q: A doctor wants to estimate the mean HDL cholesterol of all​ 20- to​ 29-year-old females. How many…

A: The formula for the sample size is as follows:

Q: In 2011 the U.S. Department of Transportation reported with 95% confidence that the average length…

A: We have to find confidence Iinterval

Q: A researcher found that a 95% confidence interval for the mean hours per week spent studying by…

A: The 95% confidence interval is given by (13,17)

Q: Data collected by the highway patrol indicates that the average speed on a stretch of interstate is…

A:

Q: A federal report indicated that 17% of children under age 6 live in poverty in Nevada, an increase…

A: Given data, p=17%=0.17 E=2%=0.02 z-value at 99% confidence is Zc=2.576 n=?

Q: Unlike most packaged food products, alcohol beverage container labels are not required to show…

A:

Q: doctor wants to estimate the mean HDL cholesterol of all 20–29-year-old females. How many subjects…

A:

Q: The mean score and the standard deviation in the Statistics test are respectively equal to 80 and…

A: Normal distribution is a continuous distribution which has many real life applications. Normal curve…

Q: wo different researchers measured the weight of two separate samples of ruby-throated hummingbirds…

A: a) Two researchers get different answers.  The researchers have two different samples. 95%…

Q: 2011, the U.S. Department of Transportation reported with 95% confidence that the average length of…

A: Given data, x=9.72 E=0.22

Q: Given the mean of the difference scores is 7.0, standard deviation of the difference scores is 3.5,…

A: Given that, The mean of the difference scores is 7.0 The standard deviation of the difference scores…

Q: A manufacturer of calculator batteries claims that the mean length of life for its battery is 500…

A: The empirical graph is, The random variable X is defined as the length of life for its battery. The…

Q: The mean of a distribution is 291, while the median is 217. Which of these statements is likely to…

A:

Q: experience shows that consumers may patronize restaurants as far as about 3 km. How large a sample…

A:

Q: A poll taken this year asked 1015 adults whether they were fans of a particular sport and 62% said…

A: sample size (n)=1015  Proportion of this year (p) =0.62 Confidence level = 0.95α = 1- confidence…

Q: In 2011 the U.S. Department of Transportation reported with 95% confidence that the average length…

A: The average length of the trip in the United States was 9.72 miles with margin of error as 0.22…

Q: What is the standard error of the point estimate vou calculated for the previous question?

A: We have given that  Sample size n= 1000 Favorable cases x= 89 Sample proportion p^=x/n = 89/1000 =…

Q: A random sample of 4000 U.S.citizens yielded 2280 who are in favor of gun control legislation. Find…

A: Given:A rondom sample of 4000 U.S citizensyielded 2280 who are in favor of guncontrol…

Q: A recent study among 150 street hawkers in Cape Town showed that 48 of them are of the opinion that…

A:

Q: if the variance of the water temperature in a lake is 28°, then for how many days would a researcher…

A: It is given that margin of error (E) is 3 and the confidence level is 99%.

Q: For an individual with a trust in government score of 3, what would their predicted Y be? (Do not…

A:

Q: A Midwest college admissions committee recently conducted a study to determine the relative debt…

A: Let, s1 and σ1 be sample and population sd's of four year graduates respectively s2 and σ2 be sample…

Q: ious example, you learned about a random sample of 60 Redeye Piranha. From that sample, a 99%…

A: a). We know that the formula of confidence interval of mean is as follows: CI=x¯±zsn, where x=sample…

Q: The proportion of junior executives leaving large manufacturing companies within three years is to…

A:

Q: A national survey of 2500adult citizens of a nation found that 25​% dreaded​ Valentine's Day. The…

A: Given that sample size is n=2500. Let p denote the true population proportion of adults those…

Q: In 2011 the U.S. Department of Transportation reported with 95% confidence that the average length…

A: Solution.

Q: The mean of 200 items is 48 and their Standard Deviation is 3. Find : The sum of all the items, (ii)…

A:

Q: A student obtained the mean and standard deviation of 100 observations as 40 and 5 respectively. It…

A:

Q: A lab technician is tested for her consistency by making multiple measurements of the cholesterol…

A: Solution: Given information: n=12 Sample size  σ= 1.2 mg/dL  Population standard deviation  s= 1.5…

Q: Nearly one-half of Americans ages 25 to 29 are unmarried. How large a sample is necessary to…

A: The provided information is The margin of error is E=0.02 α=0.05 The critical value is zc=1.96…

Q: In general,_____% of the values in a data set lie at or below the 94th percential. _______% of the…

A:

Q: The waterworks commission needs to know the mean household usage of water by the residents of a…

A: The maximum error error = 0.13 gallonsThe variance = 2.56 gallonsThe standard deviation = √(2.56) =…

Q: A consumer group reports that a 90% confidence interval for the mean fat content of chicken nuggets…

A: Given that the confidence interval is Lower limit=14 Upper limit=18 Point estimate p=?

Q: n 2011 the U.S. Department of Transportation reported with 95% confidence that the average length of…

A: Given that  Sample mean =9.72 Margin of error =E =0.22

Q: In a group presentation, the average geometric reasoning of Grade 10 students in a Mathematics camp…

A: It is given that the mean is μ=80 and the standard deviation is σ=4 Hence the p value is given by:…

Q: t is believed that 12% of Americans use a traditional antenna to watch network television.  How…

A: There are 12% of Americans who use a traditional antenna to watch network television i.e. p=0.12.…

Q: Suppose a researcher wants to test if the average diastolic blood pressure in African-Americans is…

A: Given data: Rhe average diastolic blood pressure in the general population is 70 mmHG. To find : The…

Q: In most cases of study, the statistical analysis is not giving the precise value of measurement but…

A: It is because in most cases we don't have data on the entire population but only a small part of it…

Q: What percent of our campus is female? If no preliminary study is made to estimate, how large a…

A:

Q: of all​ 20- to​ 29-year-old females. How many subjects are needed to estimate the mean HDL…

A:

Q: A researcher wishes to estimate the proportion of adults who have high speed internet access  what…

A: formula for the sample size needed to estimate a population proportion is