that the mean score of these 53 students is 147.9. Is this significantly different from the national average (u = 150, o = 15)?

Q: Two groups of students reported mean weights of 162 kgs and 148 kgs respectively. When would the…

A:

Q: what will be the value of X at the z score =-3 given, mean=10 and standard deviation =2?

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 Computer usage for 40 studente showed a sa mphe Mean of 6.2 hours, If we know that J =…

A: Given data, Sample = 40 sample mean = 6.2 population standard deviation = 2.4 Confidence interval =…

Q: A sample of 100 individuals has a mean depression score of  20 with an SD of 2. What is the standard…

A: The formula for calculating the standard error of the sample 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…

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: 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: 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: 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: Do ESL students score lower in English college placement tests than the national average? A…

A:

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: The mean score on the verbal section of the SAT in a certain year was 505 with a standard deviation…

A:

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

A:

Q: The average number of cavities that thirty-year-old Americans have had in their lifetimes is 4. Do…

A: Hey there! Thank you for posting the question. Since your question has more than 3 parts, we are…

Q: What proportion of the scores in a normal distribution falls below z= -1.32?

A: Let X ~ N(0,1). Then, P(X<-1.32)=P(X>1.32)  [ As X is symmetric about…

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

A:

Q: A distribution of scores has a mean of 51.5, a median of 51.2, and a mode of 51. Based on this…

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: 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: Samuel Morse determined that the percentage of a's in the English language in the 1800s was 8%. A…

A: Denote p as the true proportion of a’s in modern newspaper. It is reported that proportion of a’s in…

Q: A matched-subjects experiment produced at statistic with a df of 13. How many subjects participated…

A:

Q: Human body temperatures have a mean of 98.60° F and a standarddeviation of 0.62° F. If Sally’s body…

A: Let X be the human body temperatures that follows normal distribution with mean of 98.60-degree F…

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

A:

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: 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: You are told that the distribution of television weights is normal, with a mean, u of 12.6 kilograms…

A: Given,sample size(n)=8mean(μ)=12.6standard deviation(σ)=2.9

Q: A score that is 20 points above the mean corresponds to a z-score of z – 1.25. What is the standard…

A: Given: z= 1.20 20 points above the mean. that is

Q: Suppose that the blood pressure of the human inhabitants of a certain Pacific island is distributed…

A:

Q: A sample of 30 distance scores measured in yards has a mean of 7, a variance of 16, and a standard…

A: Given statistics:Consider the variable x represents the distance scores in yards.The given…

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 that the mean score of a class of 34 students was 79. The 15 male students in the class had…

A: Given that the mean score of a class of 34 students was 79. The 15 male students in the class had a…

Q: The first four deviations from the mean in a sample of n = 5 reaction times were .3, .9, 1.0, and…

A: It is given that, n=5 and  First four deviations from the mean for reaction time is 0.3,0.9,1.0,1.3…

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: What is the z-score of x=9, if it's 1.5 standard deviations to the left of the mean

A: We have to find z value from given data

Q: The claim is that the proportion of peas with yellow pods is equal to 0.25​ (or 25%). The sample…

A: Given that, x=117,n=450,p=0.25 The sample proportion is,

Q: A sample of N = 9 individuals participates in a repeated measures study that produces a sample mean…

A: The hypotheses are given below: Null hypothesis: H0:μd=0 Alternative hypothesis: H1:μd>0 The…

Q: The mean of 7 consecutive integers is 10. What is the standard deviation?

A:

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: