A particular brand of petrol was used in 80 randomly chosen cars of the same model and age. The petrol consumption, x miles per gallon, was obtained for each car. The results are summarized by 149b-23.7 Ex-1896 and Ex-45959.10 Calculate an approximate 99% confidence interval for the mean petrol consumption of all cars of this model and age.

Q: In a survey funded by the UW school of medicine, 750 of 1000 adult Seattle residents said they did…

A: Givenn=1000x=750p^=xn=7501000=0.75α=1-0.95=0.05α2=0.025zα2=z0.025=1.96

Q: A sociologist is interested in surveying workers in computer-related jobs to estimate the proportion…

A:

Q: According to a report on sleep deprivation by the Centers for Disease Control and Prevention, the…

A:

Q: In Cleveland, a random sample of 73 mail carriers showed that 10 had been bitten by an animal during…

A: Given, n1 = 73 x1 = 10 n2 = 80 x2 = 16 confidence level = 1 - α = 0.95 α = 0.05α2 = 0.025   To find,…

Q: A department store finds that in a random sample of 200 customers, 60% of the sampled customers had…

A:

Q: The data were collected in the men's 100-meter run of 16 secondary school students, and the mean…

A: Introduction: The 100 (1 – α) % confidence interval for the population mean, μ, when the population…

Q: In Cleveland, a random sample of 74 mail carriers showed that 12 had been bitten by an animal during…

A:

Q: In another pre-election poll, a pollster finds that 438 out of 600 people polled favor, Smith.…

A: Given, X = 438 N = 600 The sample proportion is given by:

Q: The manager of a fleet of automobiles is testing two brands of radial tires and assigns one tire of…

A: Given : Sample means: X¯=∑Xin=3078358=38479.375Y¯=∑Yin=3008888=37611   By using Excel first we get…

Q: A random sample of 100 Colorado residents is selected, and it is found that 82% of them have Subaru.…

A:

Q: From a survey of 400 new Wawasan Open University students chosen at random, it was discovered that…

A:

Q: In a simple random sample of 38 bulbs, 25 gives a good glow, What is a 85% score Confidence interval…

A: Given data,n=38x=25sample proportion p=xn=2538=0.66z-value at 85% confidence is Zc=1.44

Q: Generate a 95% confidence interval estimate of the true BMI

A: The descriptive analysis is conducted using EXCEL. The software procedure is given below: Enter the…

Q: In a random sample of 850​ Americans, 385 reported that they work two jobs. Which of the following…

A: The known values are, The sample proportion is,

Q: Similar to humans, it has been shown that dogs have a “handedness", preferring to use either a right…

A:

Q: In 2017, the CDC administered the Youth Risk Behavior Survey (YRBS) to a random sample of 14,795…

A: We have given that,  Favorable cases (X) = 2219 and sample size   (n) = 14795. Then,  We will find…

Q: A sample of size 84 was taken from a very large population. Sample statistics, x¯ and s, were used…

A:

Q: The workers at a certain company took a random sample of 800 manhole covers and found that 40 of…

A:

Q: In a simple random sample of births in Hanover, 434 were boys and 416 were not. Construct a…

A:

Q: A random sample of 300 graduating high school seniors was polled across a particular tristate area,…

A:

Q: The manager of a car company will select a random sample of its customers to create a 99% confidence…

A: From the provided information, Margin of error = 0.07 Confidence level = 99%

Q: The results of the National Health and Nutrition Examination Survey for the year 2011-12 found that…

A:

Q: In a sample of seven cars, each car was tested for nitrogen-oxide emissions (in grams per mile) and…

A:

Q: A study of 420,010 cell phone users found that 0.0319% of them developed cancer of the brain or…

A: Solution: Given information: n= 420010 Sample size  p^=0.0319100= 0.000319 Sample Proportion

Q: A random sample of 250 students at a university finds that these students take a mean of 14.7 credit…

A: Given:

Q: Of 1000 randomly selected cases of lung cancer, 823 resulted in death.  H0: p=0.85 Ha: p does not…

A: Confidence interval: The (1-α) % confidence interval for proportion p is given by,

Q: Alma is estimating the proportion of students in her school district who, in the past month, read at…

A: From the given information, n=50 and x = 32.

Q: A national opinion poll found that 44% of all American adults agree that parents should be given…

A:

Q: In a sample of 600 Ottawa families, it is found that 360 rent their dwellings while 240 own their…

A: It is given that sample size (n) is 360 and x is 240.

Q: A study at a community college shows that, of the 97 randomly selected first year students, 27…

A:

Q: A certain article indicates that in a sample of 1,000 dog owners, 610 said that they take more…

A: Given: Sample size (n) = 1000 Number of owners who take more picture of their dog than their owner =…

Q: a recent survey, 1100 adult Americans were randomly selected and examined for high blood pressure.…

A: Given that  Survey of Americans examined for high blood pressure. A recent survey randomly selected…

Q: population proportion, what is the 95% confidence interval estimating the proportion of businesses…

A: Given : Sample Size, n = 673 Number of successes, x = 384 confidence level,c=0.95

Q: In a random sample of 200 females and 100 males who watched a certain television program, 94 females…

A: For Females : Out of 200 females , X = 94 females indicated they like it Sample proportion 1 =…

Q: In a survey conducted by the Gallup Organization, 1100 adult Americans were asked how many hours…

A: The survey has been conducted in the Gallup organization,  1100 adult Americans and asked them that…

Q: In a random sample of 250 students who enrolled in Science, 150 took notes during classes. Find an…

A: Given that n=250,x =150,alpha =0.05 Find an approximate 95% confidence interval for the population…

Q: Suppose that a safety group surveyed 1,200 drivers. Among those​ surveyed,78​% said that careless or…

A: Obtain the 99% confidence interval estimate for the true proportion in the population of all drivers…

Q: In a preelection poll, a pollster finds that 442 out of 650 people polled favor Smith. Construct the…

A: We need to construct the 95% confidence interval for the population proportion. We have given the…

Q: A sample of 36 breastfed infants found that 2 of them developed iron deficiency by age 5.5 months.…

A: Given: n=36 x=2 Since using the plus-four method, the modified  n'=n+4=36+4=40x'=x+2=2+2=4

Q: From a random sample of 185 children from school G, 108 indicated they wanted to study science in…

A:

Q: After receiving complaints from his customers about the store being closed on Sundays, a storekeeper…

A:

Q: A study of 420 comma 026   cell phone users found that 140   of them developed cancer of the brain…

A: Find z-critical value:

Q: The birth weights of a sample of newborns were recorded for a group born to mothers who did not get…

A: Solution; The 93% confidence interval for the difference in μ1-μ2 is ( -2.12 pounds , -0.89 pounds)…

Q: In a random sample of 1250 adult drivers, 450 said that they would cut their driving by 10% if this…

A:

Q: According to a report on sleep deprivation by the Centers for Disease Control and Prevention, the…

A: Given that  p^1=7.8%=0.078p^2=8.7%=0.087n1=11937n2=4892p^=n1p^1+n2p^2n1+n2=0.0806 Confidence…

Q: A random sample of 188 books purchased at our bookstore showed that 88 books were murder mysteries.…

A:

Q: A random sample of 75 college students of MSU is selected and 16 are found to have motorcycles on…

A: As per our guidelines we are suppose to answer only one question Givensample size(n)=75no.of…

Q: In a trial of 275 patients who received 10-mg doses of a drug daily, 44 reported headache as a side…

A: The known values are, The sample proportion is,

Q: In a recent survey, 80 people were asked if they are married, and 45 responded that they are. Use…

A: Solution: Let X be the number of people who are married and n be the sample number of people. From…

Q: In a survey of 500 potential jurors, one study found that 350 were regular watchers of at least one…

A:

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.