not be true. A simple random sample of 80 hospitals at a moment during the day gives a mean noise level of 47 db. Assume that the standard deviation of noise level for all hospitals is really 9 db. All answers to two places after the decimal. (g) How many hospitals must we examine to have 95% confidence that we have the margin of error to within 0.25 db? (h) How many hospitals must we examine to have 99.9% confidence that we have the margin of error to within 0.25 db?

Q: Suppose a population is known to be normally distributed with a mean, μ, equal to 116 and a standard…

A: From the provided information,The population mean (µ) = 116The population standard deviation (σ) =…

Q: The mean wingspan of a sample of 31 birds of a particular species is 30 inches.  The standard…

A: Sample size n =31 Sample mean=30 Population standard deviation =4

Q: The scores on a mathematics exam have a mean of 71and a standard deviation of 8. Find the x-value…

A: Let X denote the scores on a mathematics exam and it follows normal distribution with mean of…

Q: You have a dataset with a mean of 50 and a standard deviation of 5. What is the coefficient of…

A: From the provided information, Mean (x̄) = 50 Standard deviation (s) = 5

Q: When we compute a standard deviation, we are trying to get a measure of the average distance of…

A: Let us understand better by assuming X1, X2, ...., Xn be n data points. Then,…

Q: how did you find the standard deviation to be 1.2. explain clearly?

A: Here we have to explain the how we get standard deviation is 1.2

Q: Find each of the requested values for a population with a mean of 72 and a standard deviation of 10…

A: PX≥85.0=PX-μσ≥85.0-7210=PZ≥1.3=1-PZ<1.3=1-0.9032 Excel function=NORM.S.DIST1.3,TRUE=0.0968

Q: In a population of exam scores, a score of X = 88 corresponds to z = 2 and a score of X = 79…

A: From the provided information, A score of X = 88 corresponds to z = 2 A score of X = 79 corresponds…

Q: The scores on two standardized tests are normally distributed. The first test had a mean of 50 and a…

A: Let I will need score = k on the second test to equal a score of 62 on the first test.  z score of…

Q: It takes an average of 12.5 minutes for blood to begin clotting after an injury. An EMT wants to see…

A:

Q: A particular fruit's weights are normally distributed, with a mean of 696 grams and a standard…

A:

Q: If you measure a quantity four times, and the standard deviation of the mean is 1.0 % of the average…

A: The goal of this problem is to check whether the confidence interval for the true value is within…

Q: In a certain design, it is important that standard deviation of the current be less than 21 mA. In a…

A:

Q: Chebyshev's Theorem states that for any set of numbers, the fraction that will like within k…

A: Chebyshev's Theorem states that for any set of numbers, the fraction that will like within k…

Q: In a population, the data value 180 has a z score of -0.8. The standard deviation of this population…

A: The question is about z score.Given :Raw value ( x ) = 180z score = -0.8Standard deviation of the…

Q: If the variance of the water temperature in a lake is 27° how many days should the researcher select…

A: Given data,σ2=27σ=5.196E=5Z-value at 95% confidence is Zc=1.96n=?

Q: For data that is not normally distributed we can't use z-scores. However, there is an equation that…

A: As per the Chebychev’s formula

Q: The mean score on a driving exam for a group of drivers education students is 72 points with a…

A: Given information: The mean score on a driving exam for a group of drivers education students is 72…