Statistics Expert Q&A
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NB
Nicole Bellorini
about 13 hours ago
The covariance can be negative but the coefficient of correlation cannot.
LM
Leonel Mazariegos
about 13 hours ago
If X and Y are independent variables with V(X)= 23.48 and V(Y)= 36.52,then the standard deviation of W = X + Y is σw = 7.746.
AS
Abhishek Shastri
about 14 hours ago
Bivariate distributions provide probabilities of combinations of two variables.
RF
Rhonda Fritzshall
about 14 hours ago
The variance of the sum always equals the sum of the variances.
CD
Caitlin Delbridge
about 15 hours ago
The Poisson random variable is a:
A) discrete random variable with infinitely many possible values.
B) discrete random variable with finite number of possible values.
C) continuous random variable with infinitely many possible values.
D) continuous random variable with finite number of possible values.
A) discrete random variable with infinitely many possible values.
B) discrete random variable with finite number of possible values.
C) continuous random variable with infinitely many possible values.
D) continuous random variable with finite number of possible values.
MC
Melanie Campos
about 15 hours ago
In a Poisson distribution,the:
A) mean equals the standard deviation.
B) median equals the standard deviation.
C) mean equals the variance.
D) None of these choices.
A) mean equals the standard deviation.
B) median equals the standard deviation.
C) mean equals the variance.
D) None of these choices.
KE
Kimberly Eidson
about 15 hours ago
The sum of the expected values always equals the expected value of the sums.
SG
Spencer Goldberg
about 16 hours ago
In the notation below,X is the random variable,c is a constant,and V refers to the variance.Which of the following laws of variance is not true?
A) V(c) = 0
B) V(X + c) = V(X) + c
C) V(cX) = c2 V(X)
D) None of these choices.
A) V(c) = 0
B) V(X + c) = V(X) + c
C) V(cX) = c2 V(X)
D) None of these choices.
JP
Jessica Price
about 17 hours ago
Which of the following cannot have a Poisson distribution?
A) The length of a movie.
B) The number of telephone calls received by a switchboard in a specified time period.
C) The number of customers arriving at a gas station in Christmas day.
D) The number of bacteria found in a cubic yard of soil.
A) The length of a movie.
B) The number of telephone calls received by a switchboard in a specified time period.
C) The number of customers arriving at a gas station in Christmas day.
D) The number of bacteria found in a cubic yard of soil.
AN
Angie Navarrete
about 17 hours ago
In the notation below,X is the random variable,E and V refer to the expected value and variance,respectively.Which of the following is false?
A) E(3X) = 3E(X)
B) V(2) = 0
C) E(X + 1) = E(X) + 1
D) All of these choices are true.
A) E(3X) = 3E(X)
B) V(2) = 0
C) E(X + 1) = E(X) + 1
D) All of these choices are true.
VK
Valeria Katona
about 18 hours ago
Which of the following is a continuous random variable?
A) The number of employees of an automobile company.
B) The amount of milk produced by a cow in one 24-hour period.
C) The number of gallons of milk sold at Albertson's grocery store last week.
D) None of these choices.
A) The number of employees of an automobile company.
B) The amount of milk produced by a cow in one 24-hour period.
C) The number of gallons of milk sold at Albertson's grocery store last week.
D) None of these choices.
HL
Harmony Lozoya
about 18 hours ago
Which of the following is a discrete random variable?
A) The Dow Jones Industrial average.
B) The volume of water in Michigan Lakes.
C) The time it takes you to drive to school.
D) The number of employees of a soft drink company.
A) The Dow Jones Industrial average.
B) The volume of water in Michigan Lakes.
C) The time it takes you to drive to school.
D) The number of employees of a soft drink company.
SS
Sudhir Sharma
about 18 hours ago
Which of the following are required conditions for the distribution of a discrete random variable X that can assume values xi?
A) 0 ≤ p(xi) ≤ 1 for all xi
B)
C) Both a and b are required conditions.
D) Neither a nor b are required conditions.
A) 0 ≤ p(xi) ≤ 1 for all xi
B)
C) Both a and b are required conditions.
D) Neither a nor b are required conditions.
TM
terry michel
about 18 hours ago
The number of accidents that occur annually on a busy stretch of highway is an example of:
A) a discrete random variable.
B) a continuous random variable.
C) expected value of a discrete random variable.
D) expected value of a continuous random variable.
A) a discrete random variable.
B) a continuous random variable.
C) expected value of a discrete random variable.
D) expected value of a continuous random variable.
