The standard deviation of test scores on a certain achievement test is 10.5. A random sample of 100 scores on this test had a mean of 76.7. Based on this sample, find a 99% confidence interval for the true mean of all scores. Then give its lower limit and upper limit. Carry your intermediate computations to at least three decimal places. Round your answers to one decimal place. Lower Limit ____ Upper Limit _____

Q: A standardized​ exam's scores are normally distributed. In a recent​ year, the mean test score was…

A: The mean test score is 1463 and standard deviation is 315. The z-score for 1860 is,…

Q: nd mean and standard deviation if n and p are 10 and 0.2 respectively.

A:

Q: Suppose a randomly selected sample of n = 50 men has a mean foot length of X = 28.1 cm, and the…

A: given data sample size (n) = 50sample mean ( x¯ ) = 28.1sample standard deviation (s) = 495% ci for…

Q: The scores on the Accuplacer test and High School GPAs are normally distributed. The Accuplacer test…

A: It is given that: For the Accuplacer test, Meanμ1=40 Standard deviationσ1=9 For the GPAs,…

Q: The scores on the Accuplacer test and High School GPAs are normally distributed. The Accuplacer test…

A: The mean of the Accuplacer test,  The standard deviation of the Accuplacer test, The mean of High…

Q: The college president asks the statistics teacher to estimate the average age of the students at…

A: From the provided information, Confidence level = 99% Margin of error (E) = 1 Standard deviation (σ)…

Q: A standardized exam's scores are normally distributed. In a recent year, the mean test score was…

A: Unusual value: The Z-value is said to be Unusual if the Z is greater than 2 or less than –2. From…

Q: An IQ test is designed so that the mean is 100 and the standard deviation is 16 for the population…

A: The following information has been provided: x¯=100σ=16

Q: An IQ test is designed so that the mean is 100 and the standard deviation is 18 for the population…

A:

Q: Assume that the readings at freezing on a batch of thermometers are normally distributed with a mean…

A: Let X be a random variable such that X: the readings at freezing on a batch of thermometers X~N0,1

Q: An IQ test is designed so that the mean is 100 and the standard deviation is 12 for the population…

A: Given : Margin of error, ME = 8.0 population standard deviation, σ = 12.0…

Q: 5 students were given a test. The average and standard deviation of the 5 scores were found to be…

A:

Q: A sample of 3000 observations has a mean of 88 and a standard deviation of 13. The distribution is…

A: Solution :  Given:   n   = 3000 samples              x¯   = 88               s   = 13 For bell…

Q: The scores on the Accuplacer test and High School GPAs are normally distributed. The Accuplacer test…

A: The distirbutions of the Accuplacer test and High School GPAs are given.

Q: Assume that adults have IQ scores that are normally distributed with a mean of 100.5 and a standard…

A: Solution: Let X be the adults IQ score has normally distributed with mean μ=100.5 and standard…

Q: An IQ test is designed so that the mean is 100 and the standard deviation is 12 for the population…

A: Given dataσ = 1299% CI, E = 3n =?for 99% CI,P(-z<μ<z) = 0.99∴z=2.576  (∵z table)

Q: Assume that the readings at freezing on a batch of thermometers are normally distributed with a mean…

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

Q: A standardized exam's scores are normally distributed. In a recent year, the mean test score was…

A:

Q: The scores on the Accuplacer test and High School GPAs are normally distributed. The Accuplacer test…

A:

Q: Assume that the readings at freezing on a batch of thermometers are normally distributed with a mean…

A: Given that, The readings at freezing on a batch of thermometers are normally distributed with a mean…

Q: A standardized​ exam's scores are normally distributed. In a recent​ year, the mean test score was…

A: Given data: the mean test score was 1550 and the standard deviation was 310. The test scores of four…

Q: The scores on the Accuplacer test and High School GPAs are normally distributed. The Accuplacer test…

A: The mean of the Accuplacer test, The standard deviation of the Accuplacer test, The mean of the High…

Q: SAT scores have a mean of 1026 and a standard deviation of 209. ACT scores have a mean of 20.8 and a…

A:

Q: A final exam in Reindeer Research Studies has a mean of 60 and a standard deviation of 5. If 25…

A: It is given that the mean is 60, the standard deviation is 5 and the sample size is 25.

Q: The scores on the Accuplacer test and High School GPAs are normally distributed. The Accuplacer test…

A: Given information: Accuplacer μ=40, σ=8 High school μ=2.6, σ=0.20

Q: Assume that adults have IQ scores that are normally distributed with a mean of 98.4 and a standard…

A: X:adults IQ scores X has normally distributed X~N(μ,σ) Mean(μ)=98.4 and Standard deviation(σ)=20.3…

Q: A standardized exam's scores are normally distributed. In a recent year, the mean test score was…

A:

Q: the mean is 146, and standard deviation is 35. A score of 181 is how many z-scores above the mean?

A:

Q: An IQ test is designed so that the mean is 100 and the standard deviation is 23 for the population…

A: Given information- Population standard deviation, σ = 23 Confidence interval = 0.95 Significance…

Q: An IQ test is designed so that the mean is 100 and the standard deviation is 18 for the population…

A: Given Information : An IQ test is designed so that the mean is 100 and the standard deviation is 18…

Q: Assume the data set described is normally distributed with the given mean and standard deviation,…

A: Given, μ = -14.3σ = 1.7n = 140    To find, P (-17.7 < X < -10.9) = ?

Q: The mean is 146 and the standard deviation is 35. A score of 41 is how many z-scores below the mean?

A:

Q: Find the 95% confidence interval for the population mean if the sample is × = 70.4 and the sample…

A: Given that  Sample size n= 24 Sample mean=70.4 Standard deviation =5