It is claimed that personal vehicle is driven 24500 km per year. Would you agree with this claim if a random sample of 100 vehicle owners were asked to keep the records of their travel and showed that an average of 28000 km with a standard deviation of 3950 km?

Q: A college professor noted that the grades of his students in an introductory statistics class were…

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Q: If a population has a standard deviation σ of 36 units, what is the standard error of the mean if…

A: The population standard deviation is 36.

Q: Suppose a population has a mean of 100 and a standard deviation of 15. If repeated samples of size…

A: Given: n = 25 σ=15μ=100 The standard deviation of the sample means can be calculated as: σX=σn

Q: A job placement director claims that the average starting salary for nurse is $25000. A sample of 15…

A: The null and the alternative hypothesis are based on the population mean: H0 : μ = 25000H1 : μ ≠…

Q: If grades on a certain test are approximately normally distributed with a mean of 75 and a standard…

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Q: Suppose a car driven under specific conditions gets a mean gas mileage of 40 miles per gallon with a…

A: Assuming that the mileage data is normally distributed, we'll calculate the z-statisic and then find…

Q: An automobile insurance company claims that its rates for teenage drivers average $470 less per year…

A: Given: population mean = 470sample size=30sample mean = 435std deviation =65

Q: The speeds of all cars on the tollway was found to be normally distributed with a mean of 63 miles…

A: It is given that that µ=63 mile per hour. Obtain the standard deviation of the speeds of all cars:

Q: If grades on a certain test are approximately normally distributed with a mean of 75 and a standard…

A: The random variable X is defined as the grades on a certain test follows normal distribution with a…

Q: A boxer would like to know the mean diameter of a navel orange. If the standard deviation is 0.3…

A: Given Standard deviations=0.3 Margin of error=0.1 At 95% confidence z=1.96

Q: A tool company claims that the mean number of defective screws they produce per box is 72. The mean…

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Q: Suppose you found that the average sea- faring bird can fly 8,000 km without stopping. The wandering…

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Q: it is claimed that personal vehicle is driven 24500 km per year. would you agree with this claim if…

A:

Q: The average standard deviation of the waiting time for a single queue is 4.7 minutes. The average…

A: The hypotheses for the test are given below: Null hypothesis: H0: σ=4.67. Alternative hypothesis:…

Q: it is claimed that personal vehicle is driven 24500 km per year. would you agree with this claim if…

A:

Q: The producer of a certain medicine claims that their bottling equipment is very accurate and that…

A:

Q: Suppose the average golfer drives the ball around 225.55 yards with a standard deviation of 8.82.…

A: Assume that the random variable x denotes the distance of balls drove by the golfer.

Q: The combined math and verbal scores for students taking a national standardized examination for…

A: GivenMean(μ)=810standard deviation(σ)=280

Q: A study of the Physics and Astronomy department has found that 95% of the graduate students drink…

A: Explanation:Here given the two means and find out the standard deviation of the sample follows the…

Q: A job placement director claims that the average starting salary for nurse is $26000. A sample of 18…

A: Given,sample size(n)=18sample mean(x¯)=25620standard deviation(s)=680α=0.05

Q: The heights of adult men in America are normally distributed, with a mean of 69.7 inches and a…

A: Given data: Mean of men (μ)=69.7 Standard deviation of men (σ)=2.63 To find: z-score=? Formula used:…

Q: Suppose a random sample of 25 measurements was taken from a population with a mean of 74 and a…

A: We know that,  Sample size (n) = 25 and population mean (μ) = 74 and population standard deviation…

Q: A tool company claims that the mean number of defective screws they produce per box is 72. The mean…

A:

Q: A dean at BUC claims that the average age of the students in this college is 25. A random sample of…

A: Note: Thank you for the question. Since it is not mentioned the standard deviation is population…

Q: The scores on a marketing exam were normally distributed with a mean of 67 and a standard deviation…

A: Given data normally distributed with mean (μ) =67, standard deviation (σ) =9.Let ‘X’ be a normal…

Q: A trucking company determined that the distance traveled per truck per year is normally​…

A: Given information- Mean weight of the bears, µ = 80 thousand miles Population standard deviation, σ…

Q: A company claims that the time their customers spend waiting in line for service is normally…

A: Given that  The company claims that the time their customers spend waiting in line for service…

Q: Nationally, the per capita monthly fuel oil bill is $110. A random sample of 36 cities in the…

A: Let μ denotes the population mean per capita monthly fuel oil bill. The national per capita monthly…

Q: For a distribution with a mean of 70, if the distribution had a standard deviation of 4, would a…

A: the PDF of normal distribution is = 1/σ * √2π * e ^ -(x-u)^2/ 2σ^2standard normal distribution is a…

Q: A teacher claimed that the average score of students in Math class was 77 with a sample standard…

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Q: If a sample of 144 male weights has a mean of 266 pounds and standard deviation of 32 pounds. The CV…

A: Given data Mean (x̅ ) = 266Standard deviation (s) = 32Coefficient of variation(CV) for sample is…

Q: Suppose that that the average BMI of the patients at Beth Israel Deaconness Medical Center is 30…

A:

Q: The heights of adult men in America are normally distributed, with a mean of 69.8 inches and a…

A: Givendata for adult men Mean(μ)=69.8standard devaition(σ)=2.62data for adult…

Q: Assume that the test scores from a college admissions test are normally distributed, with amean of…

A:

Q: The diameter of a mason jar is 3 inches but can be as large as 3.05 inches and as small as 2.95…

A: From the question we'll find the value of Cpl. While we have given the UCL = 3.05 and LCL = 2.95…

Q: The weight of oranges growing in an orchard is normally distributed with a mean weight of 6 oz. and…

A: It is given that the mean is 6 and the standard deviation is 1.5.

Q: The US department of Agriculture claims that the mean annual consumption of tea by a person in the…

A:

Q: A job placement director claims that the average starting salary for nurse is $25000. A sample of 15…

A:

Q: The heights of adult men in America are normally distributed, with a mean of 69.2 inches and a…

A: The z score indicates how many standard deviations that a data points away from the mean. It can be…

Q: The combined math and verbal scores for students taking a national standardized examination for…

A:

Q: The heights of adult men in America are normally distributed, with a mean of 69.4 inches and a…

A: Solution: Let X be the height of adult mean is America and Y be the height of adult women in…

Q: The average wage for bank managers in a certain city is $91,900 per hour with a standard deviation…

A: Given that  X~N( μ = 91900 , ? = 24300) μ = 91900 , ? = 24300 Z-score =( x - μ )/?

Q: Suppose the distribution of typing speeds in words per minute for experienced typists can be…

A: Solution: Let X be the typing speed in words per minute. From the given information, X follows…

Q: A job placement director claims that the average starting salary for nurse is $26000. A sample of 18…

A: Yes, There is enough evidence to reject the directors claim at 5% l.o.s.

Q: Suppose there is a city where the mean cost per month of a one-bedroor apartment is $1,500, with a…

A: The percentage of one bedroom apartments in the city cost between $750 and $1000 is,

Q: The combined math and verbal scores for students taking a national standardized examination for…

A:

Q: The number of points scored by éäch at the end of the season is normally distributed with a mean of…

A:

Q: A marine biologist claims that a harbor seal's average dive time is at least 5.8 minutes. A random…

A:

Q: According to the Annual survey of drugs expenditure in country X, the annual expenditure…

A: Let X be the random variable such that drugs expenditure in-country  x̅: Sample mean of drugs…

Q: A researcher claims that the amounts of acetaminophen in a certain brand of cold tablets have a…

A: Hypothesis: Hypothesis is an assumption about the parameter of the population which will be made…