If in a data set the observation 78 has z-score equal -0.60 and the observation 88 has z- score equal 1.4. Then the standard deviation s for the data set is 4 3 9,

Q: for this set of data, the standard deviation is equal to: 9,8,10,5,5,2,3,6,3

A: Mean:The formula for finding mean is shown below:

Q: for a population with a standard deviation of 5 and mean of 40, draw a bell shaped curve, marking…

A: In statistics, the empirical rule says that for normal distribution, 68%, 95%, and 99.7% of the…

Q: If a set of data has a mean of 12 and a standard deviation of 3, what is the z-score for a value of…

A:

Q: If the scores on a test have a mean of 26 and a standard deviation of 4, what is the z score for a…

A: We want to Z-score

Q: Assume that the mathematics scores on the SAT are normally distributed with a mean of 500 and a…

A:

Q: For any population, the sum of the deviation scores will be always equal to zero. true or false

A: Sum of deviation is given as: ∑i=1n(xi-a) Where, a=any arbitrary constant.

Q: What will be the interpretation if correlation (r) has a value of -.5439? At what percent does the…

A: Correlation coefficient "r" measures linear relationship between between two variables. It lies…

Q: If the mean of a list of numbers is 16.7 and the standard deviation is 0,

A: Mean is a measure of central tendency. It is one of the most important measures to find out around…

Q: If the average number of textbooks in professors' offices is 14, the standard deviation is 5, and…

A: Given that For textbooks, mean = 14, and SD = 5 For age, mean = 42, and SD = 10

Q: Suppose that in a given semester, the MEAN of units taken by students at Delta is 17 and has a…

A:

Q: If on an average 8 ships out of 10 arrive safely at a port, find the mean and standard deviation of…

A:

Q: What is the Z value for a value of X = 60?

A:

Q: If the mean height of bonsai trees is 52 cm with a standard deviation of 10 cm, 95% of the trees are…

A: NOTE : As per our guidelines we have to answer the first question if multiple questions are posted…

Q: If Quiz A has a mean of 7.6 and a standard deviation of 2.0 and Quiz B has a mean of 7.9 and a…

A:

Q: the length of a certain species of fish were found to be normally distributed. the mean length is 72…

A: Any assumption about the parameter or probability function is called a hypothesis. Given data are…

Q: The final grades in a math class has a mean of 77 and a standard deviation of 9.77 if the professor…

A: Here we need to find the cutoff for A grade. Given that the top 10% are given A. We assume that the…

Q: A population has a mean of 50 and a standard deviation of 20. Would a score of X= 70 be considered…

A: If the score X is greater than Q3 + 1.5 (IQR) or lower than Q1 - 1.5 (IQR) then score X is said to…

Q: Suppose that the mean of a set of data is 50.2 and the standard deviation is 4.2.  Assume that the…

A: Given  μ=50.2, σ=4.2, h=5.1  We want to find the new mean and standard deviation.

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

A: The percentage of the population would be between 116 and 144 is obtained below:It is given that the…

Q: Out of a class of 25 students, 24 took an exam in class and got a mean of 74 points and a standard…

A: Given: Total number of students, n = 25            Number of students who gave the test, n' = 24…

Q: Given that mean set is 15, and then z - score for the value x = 24 in this data set is z=1.5 , then…

A: We have to find the standard deviation of this set ...

Q: On a final exam, the mean mark was 68% and the standard deviation was 12%. If John’s mark was 36%…

A: Given that on a final exam, the mean mark was 68% and the standard deviation was 12%. If John’s mark…

Q: If the mean is 8, then the mean absolute deviation of the scores 10 9 3 8 10 is?

A: Given mean (μ) = 8 Then Mean Absolute Deviation is given by  1n∑xi-μ

Q: Suppose that people's heights (in centimeters) are normally distributed, with a mean of 170 and a…

A:

Q: If the standard deviation of a data is 14.50 and if each value of the data is decreased by 5, then…

A: Given : Old standard deviation = 14.50

Q: The arithmetic mean and the standard deviation of a set of 9 items are 43 and 5 respectively . If an…

A:

Q: If the mean height of bonsai trees is 42 cm and 95% of the trees are between 12cm and 72cm. The…

A:

Q: If a variable has a mean of 53, a median of 62, and a standard deviation of 4, What is its skewness?

A: The formula to find skewness is given below:

Q: Suppose a population is known to be normally distributed with a mean, μ, equal to 144 and a standard…

A: Mean = 144 Standard deviation = 27

Q: Suppose the mathematics SAT scores are normally distributed with a mean of 500 and a standard…

A:

Q: In a normally distributed data set a mean of 55 where 95% of the data fall between 47.4 and 62.6,…

A:

Q: for a population with a standard deviation of 10 and mean of 100, draw a bell shaped curve, marking…

A: We have to draw bell shaped curved and marking location of the mean and standard deviation..

Q: Suppose that for a random sample , the mean is 4 and the coefficient of variation is 87.5 % then the…

A:

Q: Suppose that people height (in centimeters) are normally distributed, with a mean of 170 and a…

A:

Q: If the mean I.Q. is 100 and the standard deviation of I.Q. scores is 15, then an I.Q. of 130 will…

A:

Q: A value of 104.2 would be how many standard deviations above the mean, given a mean of 100, and a…

A: Solution: From the given information, µ=100 and a standard deviation σ=5.6.

Q: For a set of data, μ = 71, X=35, z = -0.60. What is the standard deviation of the population?

A: Given that.   X~N( μ , ?^2 )   μ=71   , ?=?  , X=35 , z=-0.60   Z-score =( x - μ )/?

Q: If the standard deviation of a data set was originally 5, and if each value in the data set was…

A: Given that  The Standard deviation is 5

Q: Suppose the weekly rent of international students in Sydney is normally distributed with a mean of…

A: Assume,  X be the random variable which represents the amount of weekly rent in dollars. μ be the…

Q: Assume a mean of 105 papers and a standard deviation of 15 papers. Pays 40¢ for each paper, paper…

A: Given information: μ=105σ=15Cost price for paper=40 centsSelling price for paper=90 cents

Q: The mean grade of in the final examination in Mathematics was 85 and the standard deviation was 7.…

A: Since you have asked multiple questions, we will solve the first question for you. If you want any…

Q: Suppose the scores on a college entrance examination are normally distributed with a mean of 525 and…

A:

Q: In a certain test in Calculus, the mean score of a group of 100 students was 30 and the standard…

A: The mean for calculus is 30 and standard deviation is 8, the mean for physics is 52 and standard…

Q: What is the best approximation of the standard deviation ofthe measures -4, -3.0, 8, and 9?

A: Solution: Let X be the measure. The given data is –4, –3, 8 and 9.

Q: The mean age of clients at a local nail salon is 33.9 years. If 7.21% of the clients are older than…

A:

Q: Suppose that the scores on a statewide standardized test are normally distributed with a mean of 65…

A: Given information- Mean, μ = 65 Standard deviation, σ = 4 a) The percentage of scores that were…

Q: Write down the formulas for the standard deviation of p.

A: Let sample size = n Sample proportion = p̄

Q: for a population with a standard deviation of 4.2 and mean of 32.5, draw a bell shaped curve,…

A:

Q: In a given school year, the ACT test mean score was 21 with a standard deviation of 4.9. The same…

A: Z-score :  The z score measures the number of standard deviations that the values are from the mean…

Q: A mean of 200 and a standard deviation of 50. Find P60, the score which separates the lower 60% form…

A:

Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.