A score that is 3 points lower than the sample mean has a z-score of z = -0.25, and a score of X = 44 has a z-score of –0.75. What is the sample mean?

Q: For a sample of n = 30 scores, a score that is 6 points above the mean has a z-score of z = 1.50.…

A: For a sample of n = 30 scores, a score that is 6 points above the mean has a z-score of z = 1.50.

Q: Suppose you have the population values 50 and 80 and that their corresponding z-scores are -1 and 2.…

A: Given : Suppose population values 50 and 80 and their corresponding Z scores are -1 and 2 ,…

Q: Mean 255, x is 230 and z score is -2 find standard deviation

A:

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 scored 70 on a physics exam where the class mean is 80 and a SD of 9. He scored 60 on a…

A:

Q: A normal distribution has a mean of µ = 80 with σ = 20. What score separates the lowest 30% of the…

A:

Q: A population with a mean of µ = 15 has 40 scores. What is X?

A:

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: 2. What is the z-score of x if x = 2 and the median = 4, the mean = 5 and the standard deviation =…

A: Given Mean μ = 5median = 4Standard deviation σ = 2

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

A: The formula for mean is given as: X¯=1n∑Xi We are given that: n=6X1=X2=X3=X4=X6=X¯+1

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: In a population of scores, X = 83 corresponds to z = 0.50 and X = 93 corresponds to z = +2.00. What…

A: We have to find mean and sd.

Q: what will be the value of X at the z score =-2.5 given, mean=45 and standard deviation =5?

A: Mean = 45 Standard deviation = 5  Z score =-2.5 We have to find X score  for given data...

Q: find the z-score for the value 69, when the mean is 96 and the standard deviation is 5.

A:

Q: Find the​ z-score for the value 55​, when the mean is 79 and the standard deviation is 5.

A: The z score indicates how many standard deviations that a data points away from the mean. It can be…

Q: A population has a mean of 75 and a standard deviation of 15. You randomly sample nine people from…

A: Given information Mean (µ) = 75 Standard deviation (σ) = 15 Sample size = 9 Sample mean = 80 z score…

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 sample of n=7 scores has a mean of M=9. If one new person with a score of X=1 is added to the…

A: Sample of n = 7 scores has a mean of M = 9. We know that, Mean =Sum of observationsTotal number of…

Q: When we compute a standard deviation, we are trying to get a measure of the average distance of…

A: Let us understand better by assuming X1, X2, ...., Xn be n data points. Then,…

Q: If a z-score is 0, it is on the mean. True or False

A:

Q: On average, Americans have lived in 2 places by the time they are 18 years old. Is this average less…

A: Sample size is greater than 30 and the population standard deviation is known. It is appropriate to…

Q: What is the z-score of x when x = 2 and the mean = 5 and standard deviation = 3? а. -3.33 b. -3.0 C.…

A: From the provided information, Mean (µ) = 5 Standard deviation (σ) = 3

Q: What proportion of scores of a normal distribution is less than  z = - 2.15?

A: Obtain the proportion of scores of a normal distribution is less than z = – 2.15. The proportion of…

Q: For a population, a deviation score is computed as X – σ.

A: What is Deviation score ? Deviation score is basically a degree of score from which a raw score is…

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

A:

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: . The distribution of marks in a certain exami- nation was found to be normal with 23% of the…

A:

Q: A sample of n = 10 scores has a mean of M = 3. What is ΣX for this sample?

A: The general formula for the sample mean is given below:

Q: For a sample with s = 12, a score of X = 73 corresponds to z = 1.00. What is the sample mean?

A: According to the provided information, s=12 X=73 z=1

Q: suppose you have the population values 50 and 80 and their corresponding z-scores are -1 and 2, mean…

A: Let, X1=50, X2=80 and Z1=-1, Z2=2

Q: With a μ = 45 and a σ = 10, would a score of X = 50 be considered a central score (near the middle)…

A: Given, μ = 45 and a σ = 10

Q: Hello, how do you calculate this? Thank You!

A: Compute the 90% confidence interval for the population mean.Since the sample size is small and the…

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 have the population values 50 and 80 and that their corresponding z-scores are-1 and 2.…

A: Given : Suppose the population values 50 and 80 and that their corresponding z scores are -1 and 2…

Q: Mean 2, x is 5 and z score is 4 find standard deviation

A: Given ,mean(μ)=2Z-score=4and X=5

Q: The athletic director at a large university compared the proportions of freshmen (1st year students)…

A: The hypothesis is, Null hypothesis: H0: There is no difference between proportions of freshmen and…

Q: Under what circumstances is a score that is 15 points above the mean an extreme score relatively far…

A: Introduction: Consider X as a normally distributed random variable, with mean μ and standard…

Q: Find an approximate z score corresponding to a percentile of 0.33 to its RIGHT.

A: The approximate percentile to the right of 0.33 is 0.67.

Q: For a sample of n = 20 scores, X = 25 corresponds to z = -1.20 and X = 40 corresponds to z = +1.80.…

A:

Q: A sample of n=11 scores has a mean of M=9. If one new person with a score of X=4 is added to the…

A: Given that, A sample of n=11 scores has a mean of M=9. One new person with a score of X=4 is added…

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 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: 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: Find the z-score when x is 5, mean equals 7, and standard deviation 3.

A: Solution: Let X be the random variable. Then, the z-score is calculated by using the formula

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: In a sample distribution, a score of x = 21 corresponds to z = -1.00 and a score of x = 12…

A: The Z-score of a random variable X is defined as follows: Z = (X – µ)/σ. Here, µ and σ  are the mean…

Q: A sample of n = 16 scores is selected from a population with μ = 80 with σ = 20. On average, how…

A: From the provided information, it is known that

Q: The mean is only slightly less than the distribution is left skewed. which suggests the is within…

A: Since you have posted a question with multiple sub-parts, we will solve first three sub-parts for…

Q: Find the P-value in a test of the claim that the mean IQ score of acupuncturists is equal to 100,…

A: From the provided information, The mean IQ score of acupuncturists = 100 The hypotheses can be…

Q: - What percentage of guesses fell between z-scores of -1.0 to +2.0?

A:

Confidence Intervals

When we calculate intervals in probability and statistics, it can be simply termed as finding out a confidence interval. The confidence interval is usually calculated from the data set which is observed. The value of the parameter that needs to be calculated is present here only.