Suppose for 40 observations the variance is 50. If all the observations are increased by 20, the variance of these increased observations will be A. 2.5 B. 50 C. 70

Q: If the population mean and variance are 154 and 36 respectively, then the sample size that makes a…

A: Population mean = 154Variance = 36Standard error of the sample mean = 0.50

Q: Given a normally distributed population with a mean of 100 and variance 100, find ) P(90 sxs 115) 9)…

A: As per our company guidelines we are supposed to answer only first 3 sub-parts. Kindly repost other…

Q: If X is distributed as N(0,2), and Y = 3 + 2X. (a) What is the mean of Y? (b) What is the variance…

A: Normal Distribution: A continuous random variable X is said to follow Normal distribution with…

Q: 1) Calculate the variance to try throwing a dice once? 2) If the following letters are (A B C D E M…

A: Disclaimer: Since you have posted multiple questions, we will solve first question for you. If you…

Q: What is the Variance of a geometric distribution having parameter p-0.24? Select one: a. 4.167 b.…

A: We have find variance distribution...

Q: If   n =41  and    p=0.6  then the variance of the binomial distribution is

A: X~B(n,p)P(X=x)=nxpx(1-p)n-x                     x=0,1,2,3,...,nE(x)=mean=npvariance=np(1-p)

Q: A sample of n = 4 scores has SS = 60. Which is the variance for this sample? Group of answer choices…

A: Given N=4 SS=60

Q: Let X and Y be identically distributed with mean 3 and variance 25. (a) If X and Y are uncorrelated,…

A: Let X and Y be identically distributed with mean 3 and variance 25 . Therefore, EX=3,  EY=3, VarX=25…

Q: If a student scored 70 points on a test where the mean was 66 and the student's z-score was 0.42,…

A:

Q: If the mean of the Poisson distribution is 2, then the variance is .A 2 (1 – 22) .B 1 .C .D

A: Let X be a random variable following the Poisson distribution with the parameter λ. The probability…

Q: 7. If the original data are measured in pounds, the variance is (a) also measured in pounds. (b)…

A: Variance: Variance is the mean of the squares of deviations from the mean. Variance is the square of…

Q: If a sample size is equal to the population variance, then the standard error is equal to  σM = 1.…

A: The sample size is equal to population variance.

Q: Suppose X ~ a) Find the expected value of the cost per loss, E [Y,]. b) Find the Variance of the…

A: Given X~Parα=4, θ=300 with d=20

Q: The numbers of absent days a student had in the last five months are {0, 4, 2, 0, 3}. What is the…

A:

Q: Let X and Y be identically distributed with mean 4 and variance 25.(a) If X and Y are uncorrelated,…

A: a) If X and Y are uncorrelated then Cov(X,Y)=0, given V(X)=V(Y)=25 Answer(a): 50

Q: The mean of a data set is 12.5 cm, and the variance is 4.0 cm2 . What is the z-score of 9.5?…

A: Standardized z-score:   The standardized z-score represents the number of standard deviations the…

Q: the variance of a Bar examination is 900, how large a sample is needed to estimate the true mean…

A:

Q: 1 The variance of 15 observations is 4. If each observation is increased by 9, the variance of the…

A: The correct option is c  4

Q: Which of the following better approximates the variance of the sample means? b. 4. VN-n N-1 a. 4 vn

A: Varince is the measure of dispersion. It used to understand the variance of each observation from…

Q: If the variance of a binomial variate is 4, then the standard deviation of the variate is а. 2 O b.…

A: We know that, Standard deviation=√ Variance

Q: Given a normally distributed population with a mean of 100 and variance 100, find f) P(90 Sx S 115)…

A: Let X be the random variable from normal distribution with mean (μ) = 100, variance (σ2)= 100 Then,…

Q: Suppose P(X E {1,2,3})=1 and E(X) =2.5. What is the smallest and largest possible values for the…

A: P(x=i) =pi where i = 1,2,3 Since P(X belongs to {1,2,3}),  p1+p2+p3 = 1…

Q: The battery life of the new iPad Mini introduced Apple is uniformly distributed between 8.5 and 12…

A: Formula is:

Q: Solve the following problem without using excel That is, solve step by step Calculates the variance…

A: Given data is xi 6 16 26 36 46 Fai 3 10 15 30 45

Q: The speeds of motorists passing a particular point on a motorway are found to be normally…

A: Given that, The percentage of motorists whose speed exceed 120 km/h is,

Q: Given data points (2, -1), (2. 1). (3,2),(0, -1), and (3, -1), find the total variance of the data.

A: Given : Data :  (2, -1), (2. 1). (3,2),(0, -1), and (3, -1) Using data, For x =2 we have 2 different…

Q: In a binomial distribution, if n =100 and p=0.65 then the variance value of the distribution is 65…

A: From the given information, it is clear that,  In binomial n=100 and p=0.65 We know that the mean of…

Q: 5 The variance of the sample data is, a 58.773     b 57.061     c 55.400     d 53.786

A:

Q: The variance of this population data set 1.4,8.2,3.7,7.1 and 9.1 is : Select one: O A. 10.515 B.…

A:

Q: Which of the following better approximates the variance of the sample means? b. . N-1 a. 4

A:

Q: Give your own problem using the given values on the table and determine the mean, variance, and…

A: We have given that  Probability distribution for discrete.  Variance =E(X2) - [E(X)]2 Standard…

Q: If the coefficient of variation = 10% and the mean = 1000, then the %3D %3D variance is O a. 1000 O…

A:

Q: Which of the following better approximates the variance of the sample means? a. 4 b. 2. VN-n Vn N-1

A: here given, σ = population standard deviation  N= population size  n= sample size

Q: An analysis of variance produces SSb=35,SSw=15 and a F ratio with the df=1,5.What is the F ratio?

A:

Q: Some computer output for an analysis of variance test to compare means is given. Source Groups Error…

A: a) Number of groups in the given study: df for Groups=4 Number of groups-1=4 Number of groups=4+1=5…

Q: The mean is equal to of cellular phones of sold per day is therefore, it means that the average…

A: Given: x p(x) 15 0.3 18 0.2 19 0.2 20 0.15 22 0.15

Q: The estimated variance of the sample mean is,

A: Here use variance formula

Q: Given a binomial variable with a mean of 20 and a variance of 16, find n and p.

A:

Q: The formula in which   is divided by  one less than the number of observations in a sample is…

A: We know that the sample variance is given by; s2=1n-1∑i=1n(xi-x¯)2 where; n=number of…

Q: Given a normally distributed population with a mean of 100 and variance 100, find f) P(90 sx s 115)…

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

Q: Assume a variable has only 3 observations: x1=1, x2=5, x3=6. What is the variance of this variable…

A:

Q: Find the sample mean, sample SD, and sample variance given that the population mean, population SD,…

A: Given,population mean (μ)=18population SD=2n=15

Q: There is a 25% chance that a visitor to an animal shelter will adopt a dog. Out of 20 visits, what…

A: Given,n=20p=0.25X=no.of dogs that would be adopted.X~Binomial(n=20 , p=0.25)P(X=x)=cxn px(1-p)n-x ;…

Q: Calculate the variance of each of these fictitious samples: (a) 12, 6, 7, 3 (b) 9, 13, 8, 10 (c) 21,…

A: (a)   Obtain the value of variance.   The value of variance is obtained below as follows:   Use…

Q: If -7 is added to every observation in a set of data, what will happen to the variance? A. It will…

A: Variance is a statistical measure which tells the variability in that data. The variance has the…

Q: 2.Find the variances if the standard deviation are: .s = 7.3 s2 %3D S- 69

A: a. s=7.3 s2=7.32   =53.29

Q: Ms. Johnson uses a statistics program to analyze all the data collected by her students during a lab…

A: topic- statistics

Q: Let X-1: correct, X=0 : wrong And P= Pr(X=1)=2/5 What is the variance? 32 O.6 O.4

A: The Poisson distribution  is the discrete probability distribution of the number of events occurring…

Q: ppose the average height of all humans is normally distributed with a mean of 72 inches and a…

A: