You want to estimate the mean fuel efficiency of a brand of automobiles with 99% confidence and a margin of error of no more than 2 miles per gallon. Preliminary data suggests that 12.4 miles per gallon is a reasonable estimate of the standard deviation for all cars of this make and model. How large a sample do you need? O 92 O 148 O 256 324

Q: A population has a mean u=87 and a standard deviation o = 12. Find the mean and standard deviation…

A:

Q: Use the Empirical Rule. The mean speed of a sample of vehicles along a stretch of highway is 69…

A: Solution:The empirical rule for any normal distribution is given below.68% of the observations fall…

Q: Calculate the sample standard deviation using this data for how long it takes a client to buy your…

A: In this problem, we are aksed to calculate the sample standard deviation for the time it takes a…

Q: Based on the data below, answer the following question:  What is the sample standard deviations of…

A: Measure of central tendency measures the central or average value of a dataset. Measured of…

Q: The average dog at a dog facility takes 25 trials in order to learn how to sit, with a standard…

A: The normal distribution is a continuous probability distribution that has wide applications. X…

Q: In which interval are there more men: 220-240 or 280-3407 There are more men in the interval (Choose…

A:

Q: Twenty-nine college students were polled and indicated their total cost of textbooks spent on the…

A: Given The data is as follows: 91, 472, 485, 238, 592, 394, 188, 341, 266, 199, 142, 273, 189, 130,…

Q: 8. Use any method to calculate the sample mean, median, and standard deviation of the following…

A: Note: According to Bartleby guidelines expert solve only one question and rest can be reposted. Data…

Q: A normally distributed set of population scores has a mean of 65 and a standard deviation of 10.2.,…

A: Given: mean (X¯)=65   standard deviation (σ)=10.2 Sample Size (n)=46

Q: Calculate the sample standard deviation for this data set: 65, 48, 70. The formula for the sample…

A:

Q: n the 1992 presidential election, Alaska's 40 election districts averaged 1951 votes per district…

A: 1951 can be considered as a population mean because it is calculated from the whole population,…

Q: The margin of error is 6, with a sample standard deviation of 20 and 92% level of confidence. Step…

A: As the population mean is estimated on the basis of sample mean, there must be some error in…

Q: A golf association requires that golf balls have a diameter that is 1.68 inches. To determine if…

A:

Q: A population has mean 35 and standard deviationa-19. Find and o- for samples of sze 100. Round your…

A: Introduction: Denote X as a randomly selected observation from the population of interest. It is…

Q: Dr. Hill, a physical therapist, compared the average length of office visits for his male and female…

A: Here, mean1 is 5.9 and mean2 is 6.3. Standard deviations are 2.2 and 1.7. Sample numbers are 7 for…

Q: With your sample of 25 inmates, you want to test if the population mean age is different from 40 at…

A: for more information ping me    happy learning

Q: Given that the mean of a set of data is 40 and the standard deviation is 2, what is the coefficient…

A: Given,standard deviation(σ)=2mean(μ)=40

Q: Average speed on a freeway is  80  mph.   Among all vehicles 65% drive 8 miles above the speed limit…

A:

Q: A population has a mean p = 81 and a standard deviation o = 25. Find the mean and standard deviation…

A: We have ro find value of mean of sampling distribution.

Q: Calculate the standard deviation for the following sample of 4 observations. Individual Income 1. 62…

A: Below is the answer

Q: The average dog at a dog training facility takes 25 trials in order to learn how to sit, with a…

A: Given Information: Mean μ=25 Standard deviation σ=5.25 Required: To find the percentile for a dog…

Q: The Shake Out Earthquake Scenario is based on a magnitude 7.8 earthquake and serve as the basis for…

A: Given that the magnitude is 7.8 Mean is μ=2.5723 standard deviation, σ=0.6505

Q: A golf association requires that golf balls have a diameter that is 1.68 inches. To determine if…

A: One sample t-test: The one -sample t -test is used to determine whether the mean of sample differs…

Q: A population has a mean μ = 72 and a standard deviation o=27. Find the mean and standard deviation…

A: Population mean=72Population standard deviation=27Sample size n=81

Q: How high must a vehicle's gas mileage be to fall in the top 15% of all vehicles?

A: Given,  Mean μ=23 miles per gallon(mpg) Standard deviation σ=4.9 (mpg)Let x be the mileage above…

Q: Identify the data value corresponding to the indicated percentile. The amount of sleep an adult gets…

A: The normal distribution:A continuous random variable X is said to follow normal distribution with…

Q: The following table gives you the horsepower for each of the seven vacuum cleaners tested. Determine…

A: Given data is2.75,2.25,1.75,1.25,1.75sample size(n)=5

Q: Use the following information to answer the next three questions. An unknown distribution has the…

A: For the unknown population distribution, the distribution parameters are given as:The population…

Q: Find the sample size required to estimate the percentage of statistics students who take their…

A: The margin of error (E) is 0.02. The confidence level is 0.95.

Q: A quantitative data set has size 50. At least how many observations lie within three standard…

A: The size of the data set is 50.

Q: 23 30 37 53 62 ange = ample standard deviation = 88 93 95 95 98 (Please enter an exact answer.)…

A: The given data is 23,30,37,53,62,88,93,95,95,98

Q: 4.7, 5.0, 5.5, 4.2, 5.5, 5.9, 4.7, 5.4, 3.8 - samples of % peroxide in samples taken. determine the…

A: