A sample of n = 9 scores has a mean of M = 20. One of the scores is changed and the new mean is found to be M = 22. If the changed score was originally X = 7, what is its new value?

Q: A sample has a mean of 30 and s=8 would a score of x=36 be considered a central score or an extreme…

A: The z-score for x=36 when mean of 30 and standard deviation of 8 is, z=x-Means=36-308=68=0.75 It is…

Q: A sample of n=5 scores has a mean of x=9. what is Ex for this sample?

A: Mean = 9 n = 5

Q: A student calculates the value of r as +0.72 for a question comprising 5 pairs of observations and…

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Q: A professor has recorded exam grades for 10 students in his class, but one of the grades is no…

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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: Mean of 100 items is found to be 30. If at the time of calculation two items are wrongly taken as 32…

A:

Q: The sum of squares of deviations about a mean of 50 for a collection of measurements is 4750. What…

A: Given data Sum of squares of Deviation = 4750

Q: Suppose that 35% of all adults in a population would say "good" and 65% would say "bad" if they were…

A: Given Data: p=0.35 n=1000

Q: The scores of the students in the final examination in Advanced Algebra are normally distributed…

A:

Q: suppose that you scored 60 on a test that has a population mean of 64 and a standard deviation of 8.…

A: Given: Test Score x=60 μ=64σ=8 Transform in which  μ=50σ=10

Q: A distribution with u = 55 and s= 6 is being standardized so that the new mean and standard…

A: The original distribution has mean of   55 and s = 6. The X-score of original distribution is, 58…

Q: Suppose you have a test with a mean of 66 and a standard deviation of 5. If you first increase…

A: Given Mean =66 Standard deviation=5

Q: A sample of n=8 scores has a mean of M=7. If one score is changed from X =20 to X =4, what is the…

A: Consider the first 7 scores is x1, x2, x3, x4, x5, x6, x7 and the 8th score is, x8=20. The formula…

Q: A normal distribution has a mean of µ = 200 with σ = 20. If a vertical line is drawn through the…

A: Let X be a random variable such that X~N200,202

Q: mean of μ = 78. If your score is X = 70, which standard deviation would give you a better grade: σ…

A: A distribution of exam scores has mean µ=78, and σ2=42 i.e. X~N(µ=78, σ2=42) If exam score is x=70,…

Q: The scores on the 2020 ACT were approximately normal, with a population mean of μ = 22, and a…

A:

Q: Suppose that a researcher is interested in the possible relationship between the amount of screen…

A: List of formulae : Test statistic : t =rn-21-r2 Where , r is correlation coefficient. r =…

Q: A professor has recorded exam grades for 40 students in his​ class, but one of the grades is no…

A: From the provided information, Number of students = 40 The score on the exam was 82. The mean of the…

Q: Suppose that you have a X= 75 on an exam with Ú=70. Which standard deviation would give you a better…

A: Given : Suppose that you have a X= 75 on an exam with Ú=70

Q: typical results show a mean self-esteem score of m=39 with ss=60.2 for a sample of n=10 male…

A: Given:

Q: A researcher calculates the variance of her sample to be s = -6. , what would you tell the…

A: Here's the explanation for this as follows; The sample variance, s², is used to calculate how varied…

Q: A score that is 3 points lower than the sample mean has a z-score of z = -0.25, and a score of X =…

A: Given information: Case-1: z = -0.25  Score (X) = u-3  Sample mean (u) = u  Case-2: z = -0.75  X =…

Q: Suppose the correlation, r, between two variables x and y is -0.44. What would you predict about a y…

A: The correlation, r between two variables x and y is provided as – 0.44. Since, the regression line…

Q: A sample of n = 5 scores has a mean of X-bar = 9. What is ∑X for this sample?

A: From the provided information, Sample size (n) = 5 Mean (x̅) = 9

Q: Suppose that a researcher is interested in the possible relationship between the amount of screen…

A: Given information: X represents the amount of screen time each day. Y represents IQ of school-age…

Q: A sample with a mean of  8 has ∑ x = 72. How many scores are in the sample?

A:

Q: A sample of 9 freshmen takes a reading comprehension test and their scores are a mean of 10 and…

A: Consider that μ defines the population mean score.

Q: A sample of  n= 5  scores has a mean of 12 . If one new score with a value of  x=18 is added to the…

A: Given information- Sample size, n = 5 Sample mean = 12 Since we know that-

Q: Suppose you took a test and your score was reported as a z-score instead of a percentage. If your…

A:

Q: A normal distribution has a mean of µ = 200 with σ = 20. If a vertical line is drawn through the…

A:

Q: if the variance of the water temperature in a lake is 28°, then for how many days would a researcher…

A: It is given that margin of error (E) is 3 and the confidence level is 99%.

Q: On a Physicians Licensure Exam with a population mean of 83 and standard deviation of 8. Jenny…

A: It is given that Mean = 83, Standard deviation 8

Q: An individual is selected from a normal population with a of μ = 80 with σ= 20, and a treatment is…

A: It is given that the mean is 80 and the standard deviation is 20.

Q: In the same class, Idris scored 82% on a test with a z-score of 1.5 while Malik got 54% with a…

A: From the provided information, Idris scored 82% on a test with z score of 1.5 and Malik got 54% with…

Q: A population of N=5 scores has a mean of μ=8. After one score is removed, the mean is found to be…

A: We have to find given missing score.

Q: A distribution of exam scores has a mean of μ = 78. a. If your score is X = 70, which standard…

A: Given: μ=78 More the z score, better grades obtained from the standard deviation. a. The z score  is…

Q: Suppose you are working with a data set that is normally distributed with a mean of 400 and a…

A: The normal distribution: A continuous random variable X is said to follow normal distribution with…

Q: In a population with a mean of μ = 50 and a standard deviation of σ = 10, would a score of X = 58 be…

A: Given in a population with a mean of μ=50, and a standard deviation of σ=10, a score of X=58

Q: A population has µ = 50. Which value of σ would make X = 55 an extreme value out in the tail of the…

A: Given µ = 50 X = 55

Q: In a population distribution a score of x equals 28 corresponds to z equals -1.00 and a score of x -…

A: Given From the given information A score of X=28 Corresponds to z= -1 and a score of X=34…

Q: A sample of n = 5 scores has a mean of M = 12. If one person with a score of X = 8 is added to the…

A: Given n = 5 mean = 12

Q: After 3 points have been added to every score in a sample, the mean is found to be M= 83 and the…

A: After 3 points have been added to every score in a sample, the mean is found to be M= 83. The value…

Q: In a sample ofn = 6 scores, five of the scores are och above the mean by one point. Where is the…

A: Consider that the mean is x and the sixth observation is y.

Q: What percent of our campus is female? If no preliminary study is made to estimate, how large a…

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Q: In a test, the average of the grades is 80 and the standard deviation is 5. John's grade is 70, so…

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Q: If you pick 6 fruits at random, then 16% of the time, their mean weight will be greater than how…

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Q: A set of data with a mean of 45 and a standard deviation of 8.3 is n Find each value, given its…

A: A mean is 45 with standard deviation 8.3 normally distributed. μ=45σ=8.3

Q: Suppose the scores of students on an exam are normally distributed with a mean of 444 and a standard…

A: We have to find limits that include 68% data.

Q: Assume that we have made 10 repeated measurements of a quantity, and as a result the error assigned…

A: We have given that a statement. Assume that we have made 10 repeated measurements of a quantity, and…

Q: A sample of n = 5 scores has a mean of M = 8. if one new score with a value of X = 2 is added to the…

A: