Statistics Expert Q&A
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NM
Nandi Mosley
4 minutes ago
The expected value,E(X) ,of a binomial probability distribution with n trials and probability p of success is:
A) n + p
B) np(1 − p)
C) np
D) n + p − 1
A) n + p
B) np(1 − p)
C) np
D) n + p − 1
FE
Filmae Estomagulang
5 minutes ago
If n = 20 and p = 0.70,then the standard deviation of the binomial distribution is
A) 0.14
B) 2.05
C) 14.0
D) 14.7
A) 0.14
B) 2.05
C) 14.0
D) 14.7
CC
Cherry Crystal
11 minutes ago
Since there is an infinite number of values a continuous random variable can assume,the probability of each individual value is virtually 0.
JR
Julian Reyes
11 minutes ago
One requirement of bivariate distributions is that 0 ≤ P(x,y)≤ 1 for all pairs of values (x,y).
JR
Jhenn Ruelo
about 2 hours ago
The standard deviation of a binomial random variable X is given by the formula σ2 = np(1 − p),where n is the number of trials,and p is the probability of success.
AS
Andrew Stewart
about 2 hours ago
If X is a binomial random variable with n = 25,and p = 0.25,then P(X = 25)= 1.0.
MG
Marcos Gomez
about 2 hours ago
The expected number of heads in 250 tosses of an unbiased coin is 125.
BG
Benjamin Gadson
about 2 hours ago
Which of the following about the binomial distribution is not a true statement?
A) The probability of success must be constant from trial to trial.
B) The random variable of interest is continuous.
C) Each outcome may be classified as either "success" or "failure".
D) Each outcome is independent of the other.
A) The probability of success must be constant from trial to trial.
B) The random variable of interest is continuous.
C) Each outcome may be classified as either "success" or "failure".
D) Each outcome is independent of the other.
SI
SMART INVESTING
about 2 hours ago
The number of female customers out of a random sample of 100 customers arriving at a department store has a binomial distribution.
HM
Humberto Mendonça
about 3 hours ago
The variance of a binomial distribution for which n = 50 and p = 0.20 is 8.0.
LP
Lashayla Powell
about 3 hours ago
The number of customers arriving at a department store in a 5-minute period has a binomial distribution.
RP
Roxanne Posada
about 3 hours ago
The binomial probability distribution is a discrete probability distribution.
MC
Mr COMFORT MUNISI
about 3 hours ago
The portfolio expected return of two investments:
A) will be higher when the covariance is zero.
B) will be higher when the covariance is negative.
C) will be higher when the covariance is positive.
D) does not depend on the covariance.
A) will be higher when the covariance is zero.
B) will be higher when the covariance is negative.
C) will be higher when the covariance is positive.
D) does not depend on the covariance.
JD
Joseph Dayna
about 3 hours ago
The variance of a portfolio of two investments will be equal to the sum of the variances of the two investments plus twice the covariance between the investments.
TF
Teddy Frisk
about 4 hours ago
If the covariance between two investments of a portfolio is zero,the variance of the portfolio will be equal to the sum of the variances of the investments.
CK
Christin Kifer
about 4 hours ago
The covariance between two investments of a portfolio is equal to the sum of the variances of the investments.
PV
Pavan Varma
about 5 hours ago
The expected return of a portfolio of two investments will be equal to the sum of the expected returns of the two investments plus twice the covariance between the investments.
TP
tedlapelly pruthvi
about 5 hours ago
A portfolio expected return E(Rp)of 3 stocks with the quantities w1 = .40,w2 = .50,w3 = .10,E(R1)= .10,E(R2)= .15,and E(R3)= .02 is equal to 0.117.
,then the coefficient of correlation ρ is