e) Determine the mean and variance of W = 3X,-2X2+5

Q: The number of employees, wages per employee and the variance of the wages pe vemployee for two…

A:

Q: The weights (in pounds) of 6 vehicles and the variability of their braking distances (in feet) when…

A: The answer and calculation given below

Q: Suppose that X and Y are unknown with E(X) = 10, Var(X) = 4, E(Y) = 12 and Var (Y) = 100. In…

A: Solution: From the given information,

Q: The following table shows the results of an analysis of variance comparing three treatments. What is…

A: Given that the table shows the results of an analysis of variance comparing three treatments.

Q: If X B(7,0.2), the variance of X is

A: It is given that X follows Binomial(n = 7, p = 0.2)

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: in the previous example, the adult weighing 285 pounds decides to not paricipate in the study. what…

A:

Q: If a least squares line were determined for the data set in each scattergram, which would have the…

A: If the least squares line were determined for the data set in each scatter plot  which would have…

Q: If the coefficient of variation = 10% and the mean = 1000, then the variance is O a. 1000 O b. 10000…

A: Option (b) is Correct

Q: We can eliminate some outlier problems by using O a. Interquartile range O b. Range O C. Coefficient…

A: We have to find correct option.

Q: In a project you are managing, if you estimated the optimistic(a), most likely(m) and pessimistic(b)…

A:

Q: and the r = 0.6241. What is the correlation coefficient for this data set? r =

A: We have given that  The regression equation is  y^ = 70.25 + 54.57x and r2 = 0.6241

Q: b) The following table gives the values of mean and variance of heights and weights of the 10th…

A: Mean and variance of the heights and weights of the 10th standard of a school are given.

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: Compute the correlation coefficient. 25416 y 3 61 2 4 Send data to Excel

A: The correlation coefficient formula is: where, The table that shows the necessary calculations is…

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

A:

Q: Then the variance of Y is

A: Given, E(Y/X=x)=2xvar(Y/X=x)=4x2 f(x)=1, 0<x<10, e.w

Q: Compute the correlation co-efficient between the variables X and Y represer following table: X 4 11…

A: Correlation It tells how the variables are linearly related with each other. It represents the…

Q: 1.2. Calculate the correlation of coefficient (r).

A: Here, Two variables are given, X : Income per annum (in R 1000)  Y : Life Insurance (in R 1000) The…

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: We can ellminate some outlier problems by using O A. Variance O B. Coefficient of variation O C.…

A: Since the outliers have the least affect on Inter quartile range,

Q: (d) Guess the correlation coefficients for the following scatter plots. r= ?

A: Correlation: By correlation we mean the association or interdependence between two variables. If two…

Q: Suppose you have the hemoglobin level for 15 children. Based on the values provided, find the…

A:

Q: An insurance company keeps a record of insurance plans sold per day for the past 150 days, as…

A: Solution: x =Number of Insurance plans sold per day  f= Frequency of occurance  x  (f) x2 fx fx2…

Q: Plot the following data points. 4) 1 3 4' 4 2,2 2 3 2.

A:

Q: A sales agent brings in $50,000 in revenue during her first year on the job. If the correlation…

A: The answer to the above question is as follows :

Q: The average scores of the students in a Statistics test is 14.5 and the variance is 36. Find the…

A: Given: The mean scores of students in Statistics is given as:…

Q: Discuss the Skewness and Kurtosis and find the mean and the variance for the following ungrouped…

A: From the given information we want to find skewness, kurtosis and mean variance.

Q: what is the value of SP for the following set of data? x           y 1          4 2          4 9…

A: From the given information,

Q: The average number of matches where the football matches of the Galatasaray football team were…

A: Given : The average number of matches where the football matches of the Galatasaray football team…

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

A:

Q: Suppose that 67% of college students in Australia use more than 1.65 gigabytes of data on their…

A:

Q: the accounting department analyzes the variance of the weekly unit costs reported bytwo production…

A:

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), (3,-1)

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: d) Calculate the coefficient of determination and the coefficient of correlation, by applying the…

A:

Q: is there relationship between the life expectancy for men and the life expectancy for women in a…

A: Given data represents a random sample of non -industrialized countries was selected and the life…

Q: Suppose for 40 observations the variance is 50. If all the observations are increased by 20, the…

A: given If the values of all 40 observations are increased by 20 the mean increases by 20 as well,the…

Q: Calculate variance and co-efficient of variation from the following data: Class Interval : 12-16…

A: Class Frequency 12 - 16 2 16 - 20 8 20 - 24 18 24 - 28 10 28 - 32 6 32 - 36 5

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

A:

Q: For a population that is normally distributed with a very large population size compared to the…

A: From the given information, let X be a random variable which follows normal distribution with mean…

Q: find the variance for the given data 7 7 2 5 1

A: The mean of the data can be calculated as:

Q: The sample correlation coefficient is equal to the covariance of x and y divided by the square root…

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

Q: The following set of data is given 2; 4; 5; 3; 6; 2; 3 Determine the value of coefficient of…

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

Q: We are interested in determining whether or not the variances of the sales at two music stores (A…

A:

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: Complete the organizer for one-way analysis of variance.                   SS df MS F-test…

A:

Q: o the population variance

A: Generally, we obtain the variance based on the sample data but if in the problem there is mention…

Q: A researcher gathers data from a sample that consists of five scores of 5, 7, 2, 7 and 9. a. Find…

A: a) From the data to calculate mean and standard deviation μ= Σxin = 305=6σ= Σ(xi-x¯)2n  = 285  =…