2. A school has 6,000 students with a mean weight of 80lbs, with a standard deviation of 25 Ibs. If you draw a random sample of 50 students, what is the mean µz , variance o²z , and standard deviation az of the sampling distribution of the sample mean? (Show solution to gain point in each correct answer o?x = Ox = Hx =

Q: what is the sample standard deviation?

A:

Q: In a series of 5 observations, the values of mean and variance are 4.4 and 8.24. If three…

A: It is given that the mean and standard deviation are 4.4 and 8.24.

Q: If a population has a standard deviation σ of 36 units, what is the standard error of the mean if…

A: The population standard deviation is 36.

Q: A population has mean µ = 40 and %3D standard deviation o = 20. What should %3D the sample sizen be…

A:

Q: A sample of 90 items has mean 55 and standard deviation 3. A second sample of 110 items has mean 60…

A:

Q: An educational study to be conducted requires a test score in the middle 40% range. If the mean is…

A: Let us assume X=score Given that X follows a normal distribution with mean= 100 and standard…

Q: A simple random sample of 36 observations was taken from a large population. The sample mean and the…

A: The sample mean and the standard deviation are μ = 80 and σ = 12 respectively.Let X denotes the…

Q: Assume that 26% of students at a university wear glasses. Suppose 300 students are randomly…

A:

Q: Assume thAt scores on a standardized test are known to follow a bell shaped distribution with a mean…

A: L

Q: uppose you have a data set of size of 26 with mean 50 and standard deviation 8. If u subtract 8 from…

A:

Q: A population has SS = 100 and variance = 4.  How many scores are in the population?

A: The formula of the population variance is ,

Q: A random sample of 18 light bulbs is drawn from a normally distributed population. The population…

A:

Q: A simple random sample of 64 observations was taken from a large population. The sample mean and the…

A:

Q: You have a sample mean of 11, a population average of 17, and a standard error of the mean of 3.…

A: Givensample Mean(x)=11population average(μ)=17standard error(SE)=3

Q: if the standard deviation of a sample is 0.5 find the variance

A:

Q: Mrs. Santos administered a Science Achievement Test to a random 45 graduating SHS students. In this…

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

Q: Assume you have taken 125 samples of size 81 each from a population. The population variance is 64.…

A:

Q: A population of scores has u=55 and o=15.  if 5 points are subtracted from every score in the…

A: The given data is μ = 55σ = 15 Suppose x1, x2, x3, x4, ..., xn are the data points…

Q: For a sample with a mean if M=63, a score of X=54 corresponds to Z= -0.75. what is the sample…

A: Given,Mean(M)=63a raw score(X)=54Z-score=-0.75

Q: For a random sample of 9 women, the average resting pulse rate is x̅ = 76 beats per minute, and the…

A: Given: Sample size (n) = 9 Sample mean x¯=76 Sample standard deviation (s) = 5

Q: A simple random sample of 64 observations was taken from a large population.  The sample mean and…

A: Solution-: Given: n=64,x¯=320,s=120 We want to find the standard error of the sample mean=?

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: When sampling from a population with mean μ and standard deviation σ, the sampling distribution of…

A: Given that  Population with mean μ and standard deviation σ

Q: A simple random sample of 36 observations was taken from a large population. The sample mean and the…

A:

Q: Calculate the observed z value using a sample mean of 25, a population average of 20, and a standard…

A: Given data: Sample mean = 25 Population  average = 20 Standard error of the mean  = 8

Q: standard deviation of a set of 12 measurements has a numerical value of 3. If one of the…

A: Given a set of observations n=12Given measurements have a numericalone of the given measurements…

Q: The variance of a sample of 100 observations 81. the standard deviation of the sample equals?

A:

Q: How many of the sample of families would fall above 2 standard deviations from the mean? A. 0 B. 1…

A:

Q: A population has a mean of u=50 and a standard deviation of 0=10. If 3 points were added to every…

A: The properties of mean are:E(X + a) = E( X ) + a * E(X+a)=E(X)+aE(aX)=aE(X)The property of variance…

Q: If a data set has 16 values and a standard deviation 9.4, then the variance is

A: Given information: A data set consists of n = 16 values. The value of the standard deviation is, s =…

Q: A random sample of 11 items is drawn from a population whose standard deviation is unknown. The…

A: Given data Random sample 0f 11 items is drawnsample mean is x=920sample standard deviation is s=25

Q: S = 2722 - 16,900/7 7-1

A: The given equation is:

Q: P3. Show that the mle of unknown standard deviation when the mean is known is different from the…

A:

Q: IF THE VARIANCE OF A POPULATION IS 0.75, THE STANDARD DEVIATION MUST BE?

A: It is an important part of statistics . It is widely used .

Q: A population has μ = 50 and σ = 5. If 10 points are added to every score in the population, what are…

A: Consider, (µ) = 50 and (σ) = 5 Let, X be the scores of the population. If 10 points are added to…

Q: A population of scores has a mean of 56. In this population, a raw score of 40 corresponds to a z…

A: Given Information: A population of scores has a mean of 56. μ=56 Raw score X = 40 corresponds to a z…