UCF QMB 3200 Final Exam Completed Updated
Version with All Questions and 100% Correct
Answers
Cluster sampling is - Correct Answer-a probability sampling method.
When we conduct significance tests for a multiple regression relationship, the t test can be
conducted for each of the independent variables in the model. Each of those tests are called
tests for - Correct Answer-Individual significance.
In a multiple regression model, the error term ε is assumed to have a mean of - Correct
Answer-0
In general, R2 always _____ as independent variables are added to the regression model. -
Correct Answer-Increases.
The multiple regression equation based on the sample data, which has the form of y^ hat=
b0+b1x1+b2x2+....+bpxp, is called - Correct Answer-An estimated multiple regression
equation.
,Looking at the sample correlation coefficients between the response variable and each of
the independent variables can give us a quick indication of which independent variables are,
by themselves, - Correct Answer-Good predictors.
When carrying out an F test to determine if the addition of extra predictor variables results
in a significant reduction in the error sum of squares, what are the degrees of freedom of
the numerator and denominator of the F statistic? - Correct Answer-The numerator degrees
of freedom equals the number of predictors added to the model. The denominator degrees
of freedom is n—p—1.
The regression model y=B0+B1x1+B2x2+B3x2^2+B4x2^2+B5x1x2+e is a - Correct Answer-
second-order model with two predictor variables.
The central limit theorem states that - Correct Answer-if the sample size n is large, then the
sampling distribution of the sample mean can be approximated by a normal distribution.
The value of the _____ is used to estimate the value of the population parameter - Correct
Answer-sample statistic
The sampling distribution of is the - Correct Answer-probability distribution of all possible
values of the sample proportion.
Which of the following is not a symbol for a parameter? - Correct Answer-S.
The sample statistic characteristic s is the point estimator of - Correct Answer-σ..
, The distribution of values taken by a statistic in all possible samples of the same size from
the same population is called a - Correct Answer-sampling distribution.
Which of the following is a point estimator? - Correct Answer-S.
As a rule of thumb, the sampling distribution of the sample proportion can be approximated
by a normal probability distribution when - Correct Answer-n(1 - p) ≥ 5 and np ≥ 5.
A sample of 92 observations is taken from an infinite population. The sampling distribution of
is approximately - Correct Answer-normal because of the central limit theorem.
The central limit theorem is important in Statistics because it enables reasonably accurate
probabilities to be determined for events involving the sample average - Correct Answer-
when the sample size is large regardless of the distribution of the variable.
The distribution of values taken by a statistic in all possible samples of the same size from
the same population is the sampling distribution of - Correct Answer-The sample
Which of these best describes a sampling distribution of a statistic? - Correct Answer-It is
the distribution of all of the statistics calculated from all possible samples of the same
sample size.
The probability distribution of all possible values of the sample proportion is the - Correct
Answer-sampling distribution of p.
Version with All Questions and 100% Correct
Answers
Cluster sampling is - Correct Answer-a probability sampling method.
When we conduct significance tests for a multiple regression relationship, the t test can be
conducted for each of the independent variables in the model. Each of those tests are called
tests for - Correct Answer-Individual significance.
In a multiple regression model, the error term ε is assumed to have a mean of - Correct
Answer-0
In general, R2 always _____ as independent variables are added to the regression model. -
Correct Answer-Increases.
The multiple regression equation based on the sample data, which has the form of y^ hat=
b0+b1x1+b2x2+....+bpxp, is called - Correct Answer-An estimated multiple regression
equation.
,Looking at the sample correlation coefficients between the response variable and each of
the independent variables can give us a quick indication of which independent variables are,
by themselves, - Correct Answer-Good predictors.
When carrying out an F test to determine if the addition of extra predictor variables results
in a significant reduction in the error sum of squares, what are the degrees of freedom of
the numerator and denominator of the F statistic? - Correct Answer-The numerator degrees
of freedom equals the number of predictors added to the model. The denominator degrees
of freedom is n—p—1.
The regression model y=B0+B1x1+B2x2+B3x2^2+B4x2^2+B5x1x2+e is a - Correct Answer-
second-order model with two predictor variables.
The central limit theorem states that - Correct Answer-if the sample size n is large, then the
sampling distribution of the sample mean can be approximated by a normal distribution.
The value of the _____ is used to estimate the value of the population parameter - Correct
Answer-sample statistic
The sampling distribution of is the - Correct Answer-probability distribution of all possible
values of the sample proportion.
Which of the following is not a symbol for a parameter? - Correct Answer-S.
The sample statistic characteristic s is the point estimator of - Correct Answer-σ..
, The distribution of values taken by a statistic in all possible samples of the same size from
the same population is called a - Correct Answer-sampling distribution.
Which of the following is a point estimator? - Correct Answer-S.
As a rule of thumb, the sampling distribution of the sample proportion can be approximated
by a normal probability distribution when - Correct Answer-n(1 - p) ≥ 5 and np ≥ 5.
A sample of 92 observations is taken from an infinite population. The sampling distribution of
is approximately - Correct Answer-normal because of the central limit theorem.
The central limit theorem is important in Statistics because it enables reasonably accurate
probabilities to be determined for events involving the sample average - Correct Answer-
when the sample size is large regardless of the distribution of the variable.
The distribution of values taken by a statistic in all possible samples of the same size from
the same population is the sampling distribution of - Correct Answer-The sample
Which of these best describes a sampling distribution of a statistic? - Correct Answer-It is
the distribution of all of the statistics calculated from all possible samples of the same
sample size.
The probability distribution of all possible values of the sample proportion is the - Correct
Answer-sampling distribution of p.
