In a 1992 article in the Journal of the American Medical Association, researchers reported that a more accurate average body temperature for adults is 98.2°F with a standard deviation of 0.7°F. Assume that a Normal model is appropriate N(98.2, 0.7). The middle 60% of N(0,1) is between -0.842 and 0.842 What adult body temperature is at the 80th percentile?

Q: Scores on the GRE (Graduate Record Examination) are normally distributed with a mean of 530 and a…

A: The objective of the question is to find the percentage of people taking the GRE who score within…

Q: A random sample of 82 eighth grade​ students' scores on a national mathematics assessment test has a…

A: From given data we have : n=82 μ=280,σ=37

Q: A sample of n=25 scores has a mean of 68. Find the z-score for this sample. If it was obtained from…

A:

Q: The head of institutional research at a university believed that the mean age of full-time students…

A: The random variable age follows normal distribution. The population mean is 27.4 years. We have to…

Q: A random sample of 26 local sociology graduates scored an average of 458 on the GRE advancef…

A:

Q: Age at onset of dementia was determined in the general population to be 70 and standard deviation…

A: Given Information: Age at onset of dementia was determined in the general population to be mean 70…

Q: ccording to 2014 data from the Centers for Disease Control and Prevention, the average life…

A: Given: n=45 X=45.2σ=16.5

Q: In a 2005 study, researchers reported that the average weight of adults aged 20 years and older is…

A:

Q: In a random sample of 8 cell​ phones, the mean full retail price was ​$521.70 and the standard…

A: A random sample of 8 cell​ phones, the mean full retail price was ​$521.70 and the standard…

Q: A population of scores has μ = 80. In this population, a score of X= 92 corresponds to z = 5. what…

A: Given: μ = 80 z = 5 X= 92

Q: A population has a standard deviation of σ = 18. On average, how much difference should exist…

A: Given data, σ = 18 n = 4   The standard error measures the distance expected on an average between…

Q: According to the empirical rule (or the 68-95- 99.7 rule), if a population has a normal distribu-…

A:

Q: Suppose that the hemoglobin levels among healthy females are normally distributed with a mean of…

A: Solution

Q: In a recent study, the Center for Disease Control reported that diastolic blood pressure (in mmHg)…

A:

Q: How many retired people should be sampled if we want to calculate with 92% confidence the true mean…

A: The provided information are: Confidence level = 92% Margin of error (E) = 0.8 Population standard…

Q: 01:09:27 Response time is an important statistic for measuring the effectiveness of a fire…

A:

Q: A simple random sample of 40 items resulted in a sample mean of 25. The population standard…

A: Givensample size(n)=40sample Mean(x)=25standard deviation(σ)=5

Q: The t-value of t = fall between -to.95 and to.95 because to.95

A: given that n = 13  sample mean =  1195 sample standard deviation = 169.3  population mean = 1016

Q: A shareholders' group is lodging a protest against your company. The shareholders group claimed that…

A:

Q: In a 1992 article in the Journal of the American Medical Association, researchers reported that a…

A:

Q: In a random sample of 9 cell phones, the mean full retail price was $522.30 and the standard…

A: Sample size n=9 with sample mean  X̄= $522.30 Standard deviations s=$175.00 Population mean μ=…

Q: A sample of n=25 scores has a mean of 68. Find the z-score for this sample. If it was obtained from…

A:

Q: The standard deviation of the pollution by-products released in the burning of 1 gallon of gas is…

A: Step 1:Determine the given variables n=25, σ=2.3,s=1.8Step 2:Hypotheses Ho​:σ=2.3vs…

Q: Sketch a normal distribution/bell curve with a mean of 60 and a standard deviation of 20.  What…

A: Given that  X~Normal( μ=60 , σ=20 )

Q: For a large metropolitan area, carbon monoxide concentrations in air samples come from a normal…

A: We have to find out answer of given question....

Q: The average of the grades obtained in an exam shows a normal distribution with 56 and a standard…

A: We have to find the lowest grade to pass..

Q: The heights (in inches) of males in the United States are believed to be approximately Normally…

A:

Q: Q scores based on the Wechsler Adult Intelligence Scale (WAIS) are assumed to be normally…

A: Given data,Mean μ=100standard deviation σ=15Score is x=125z-score=?

Q: Assume that adults have IQ scores that are normally distributed with a mean of 100.3 and a standard…

A: Assume that adults have IQ scores that are normally distributed with a mean of 100.3 and a standard…

Q: na random sample of 9 cell phones, the mean full retail price was $509.10 and the standard deviation…

A:

Q: Assume that the heights of a population of adults form a normal distribution with a mean µ =69…

A: It is known that, there are 12 inches in 1 foot.The provided information are:

Q: A shareholders' group is lodging a protest against your company. The shareholders group claimed that…

A: Given, Sample size = 120 Sample mean = 7.3 Sample standard deviation = 5.8   Set up the null and the…

Q: ssume that stress level scores are normally distributed with a population mean of 25 and a…

A: Given data, Mean=25 sd =2.5 If n=9 P(23<X<26)=?

Q: Assume that the number of days from conception to birth is normally distributed with a mean of 271…

A: Given that  Mean = 271, SD = 4 X = 238

Q: For a population with population mean 80 and standard deviation10, what is the z-score corresponding…

A:

Q: In a 1992 article in the Journal of the American Medical Association, researchers reported that a…

A: Given In a 1992 article in the Journal of the American Medical Association, researchers reported…

Q: A report from 2010 indicates that Americans between the ages of 8 and 18 spend an average of μ = 7.5…

A: Given: Americans between the ages of 8 and 18 spend an average of μ = 7.5 hours per day distribution…