What is the standard deviation for these results?

Q: Use z-scores to compare the preformance of a student on two midterms: the first, with a mean of 78…

A: Given Information: The performance of a student on two midterms: First: Mean = 78, standard…

Q: Scores on a Literature test have an average of 80 with a standard deviation of 6. What is the…

A: Solution: Let X be the score on a Literature test. From given information, X has mean µ=80 and a…

Q: When IQ scores are normally distributed with a mean of 100 and a standard deviation of 15. What is…

A:

Q: What percent of the population lies between +1.96 standard deviations above the mean and +2.58…

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

Q: If a set of data is normally distributed with a mean of 50 and a standard deviation of 5, a z-score…

A:

Q: What distribution is used in this chapter to make inferences for one population standard deviation?

A:

Q: If an analysis of variance produces a value of F = 1.00, then all the samples have the same mean.…

A: We know that- The value of F is the ratio of two mean squares. When the value of F = 1, then there…

Q: What is the z score of x=30 if x is three deviations to the left of the mean?

A: From the provided information, x = 30 and it is three deviations to the left of the mean.

Q: Scores on a history test have average of 55 with standard deviation of 10. What is the probability a…

A:

Q: A score that is 12 points below the mean corresponds to a z-score of z= -1.50. What is the standard…

A: Given that, A score that is 12 points below the mean corresponds to a z-score of z= -1.50.

Q: Scores on an endurance test for cardiac patients are normally distributed with mean of 185 and…

A: Given that, Scores on an endurance test for cardiac patients are normally distributed with mean of…

Q: Scores by women on the SAT-1 test are normally distributed with a mean of 988 and a standard…

A: Given Information Now we have to calculate corresponding Z value                         Z = 0.7388…

Q: An analysis of a data set (N = 16) has revealed that its standard deviation (SD) of 2. Then, what is…

A: GivenN=16standard deviation(SD)=2

Q: Show that the standard deviation of z-scores equals 1

A: z score is given by, z score = x-μσ Where, x: Raw score μ: Population mean. σ: Population standard…

Q: The expected annual returns are 15% for investment 1 and 12% for investment 2. The standard…

A: In question, Given that The expected annual returns are 15% for investment 1 and 12% for investment…

Q: Scores on a history test have an average of 80 with a standard deviation of 6. What is the z-score…

A: Let X represent the scores on a history test   Mean=80 SD=6   X~ Normal (80, 62)

Q: When you use the two-standard-deviations F-test, what assumption must be met by the variable under…

A:

Q: What is another name for the standard deviation of the variable x? What is the reason for that name?

A:

Q: Pulse rates of women are normally distributed with a mean of 77.5 beats per minute and a standard…

A: Given dataMean = 77.5Standard deviation = 11.5Formula to calculate z-score is given by

Q: A random variable Y has normal distribution with a mean of 80 and a standard deviation of 15.  What…

A: Mean()=80Standard deviation()=15

Q: What is the z-score of x = 11, if it is 2.5 standard deviations to the left of the mean?

A:

Q: What is the standard error of the mean for a sample that has n=53 people and comes from a population…

A: It is given that n = 53s = 11

Q: Are your results accurate just because they were within 1 standard deviation of the mean?    Are…

A: Not necessarily. The standard deviation is a measure of how spread out the data is around the mean.…

Q: IQ scores can be described by a Normal model with mean 100 and standard deviation 17. (Use 4…

A: Given data,μ=100σ=17

Q: If the population standard deviation is unknown, which should be used in its place?

A: The population standard deviation is unknown.

Q: If a z-score is equal to −2.05, it is 2.05 standard deviations below the mean. True or False

A: The standardized difference, which measures the difference between a random score (i.e., a value…

Q: hat is the probability thata student completes the physical nthess ninutes? less than +0.52% +0.13%…

A: 1)   2) 3)

Q: IQ scores are normally distributed with a mean of 100 and a standard deviation of 15. Using the…

A:

Q: What is the z-score of x = 9, if it is 0.133 standard deviations to the left of the mean?

A: Given X=9,

Q: A random variable is normally distributed with mean 14.2 and standard deviation 18.4. What value is…

A: According to the provided information, mean μ=14.2standard deviation σ=18.4z-score = 3

Q: The patient recovery time from a particular surgical procedure is normally distributed with a mean…

A:

Q: The distribution will be approximately a normal curve with mean_____and standard deviation_____ .

A: It is given that Mean = 104 And SD = 18 Sample size n = 100

Q: The standard deviation of the sample mean is less than the standard deviation of the population.…

A:

Q: uppose you have the population value 50 and 80 and that their corresponding z-scores respectively.…

A: Given Data: Population value=50 and 80   we also know the corresponding z-score

Q: A designer collected information on the price of a random sample of newly designed products and the…

A: Note: Hey there! Thank you for the question. As you have posted a question with multiple sub-parts,…

Q: IQ scores have a bell-shaped distribution with a mean of 100 and a standard deviation of 15.…

A: Introduction: Denote X as the random variable indicating a randomly selected IQ score, which has a…