Statistics Quiz Notes
Q) If the correlation between two variables X and Y are zero, then the two variables are
A) Not related
Q)Which value of r indicates a stronger correlation than 0.25?
Note: r is a number between -1 and +1. The plus or minus only indicate the direction of the correlation. Therefore -0.30 has a stronger correlation than +.025.
Q)If the correlation coefficient is 0.78 then the coefficient of determination is
A) 0.6084
Note coefficient of determination is equal to (correlation coefficient)2
Coefficient of Determination is the square of Coefficeint of Correlation
.78 2 = 0.6084
Q) The dependent variable has a score in the case of
logistic regression:
A) False
-logistic regression is used for variables that have set values, such as yes/no.
Q) For a seven-year moving average, how many values
will be lost at the beginning and end of the time series?
A) Three at the start and three at the end
Q)In
binomial logistic regression, the dependent variables consists of more than two
categories
A) False
-binomial means two.
Q) A moving average method is:
A) . A
method that can be used to smooth out a time series
Q) Given the trend equation, Ŷ = 50 + 1.2t (base year
= 2006), what would be the forecast value for 2010?
A) 56
-Assign base year t1. In this equation t = 5. Ŷ = 50 + 1.2(5). Ŷ = 56.
Q) Similar
to linear regression, logistic regression has one or more independent variables
A) True
Q) Identify
the component of time series that will contain an upward or downward pattern in
a time series:
A) Trend
Q) In the case of logistic regression, we estimate how
much the natural logarithm of the odds for Y =1 changes for a unit change in X.
A) True
Q) If the probability of event A is 0.2 and that of event B is 0.10 then the odds ratio is
A) 2.25
