BUAL 2650 Final Exam (Chen Yan) |
QUESTIONS AND ANSWERS | SOLVED
100% CORRECT!!
When testing a hypothesis about the mean of mean of a population of
paired differences in which two different observations are taken on
the same units, the correct test statistic to use is_________. -
ANSWERS-T
When testing the difference between two populations proportions
using large independent random samples, the ___________ test statistic
is used. - ANSWERS-Z
If we are testing the hypothesis about the mean of a population of
paired differences with samples of n1=10, n2=10, the degrees of
freedom for the t statistic is __________. - ANSWERS-9
In simple linear regression analysis, the correlation coefficient (r) and
the slope (b) _____________ have the same sign - ANSWERS-always
All of the following are assumptions of the error terms in the simple
linear regression model except? - ANSWERS-a) errors are normally
distributed
b) error terms have a mean of zero
, c) error terms have a constant variance
*d) error terms are dependent on each other*
The __________ measures the strength of the linear relationship
between the dependent variables and the independent variable. -
ANSWERS-Correlation coefficient
In simple regression analysis, the quantity that gives the amount by
which Y (dependent variables) changes for a unit change in X
(independent variable) is called the________________. - ANSWERS-slope of
the regression line
A simple regression analysis with 20 observations would
yield__________ degrees of freedom error and _________________ of
freedom total. - ANSWERS-18, 19
The mean life of a pair of shoes is 40 months with a standard deviation
of 8 months. If the life of the shoes is normally distributed, how many
pairs of shoes out of one million will need replacement before 36
months? - ANSWERS-308,537
A standard normal distribution has a mean of_______ and standard
deviation of _________. - ANSWERS-Zero, One
The area under the normal curve between z=0 and z=1 is_________ the
area under the normal curve between z=1 and z=2. - ANSWERS-greater
than
QUESTIONS AND ANSWERS | SOLVED
100% CORRECT!!
When testing a hypothesis about the mean of mean of a population of
paired differences in which two different observations are taken on
the same units, the correct test statistic to use is_________. -
ANSWERS-T
When testing the difference between two populations proportions
using large independent random samples, the ___________ test statistic
is used. - ANSWERS-Z
If we are testing the hypothesis about the mean of a population of
paired differences with samples of n1=10, n2=10, the degrees of
freedom for the t statistic is __________. - ANSWERS-9
In simple linear regression analysis, the correlation coefficient (r) and
the slope (b) _____________ have the same sign - ANSWERS-always
All of the following are assumptions of the error terms in the simple
linear regression model except? - ANSWERS-a) errors are normally
distributed
b) error terms have a mean of zero
, c) error terms have a constant variance
*d) error terms are dependent on each other*
The __________ measures the strength of the linear relationship
between the dependent variables and the independent variable. -
ANSWERS-Correlation coefficient
In simple regression analysis, the quantity that gives the amount by
which Y (dependent variables) changes for a unit change in X
(independent variable) is called the________________. - ANSWERS-slope of
the regression line
A simple regression analysis with 20 observations would
yield__________ degrees of freedom error and _________________ of
freedom total. - ANSWERS-18, 19
The mean life of a pair of shoes is 40 months with a standard deviation
of 8 months. If the life of the shoes is normally distributed, how many
pairs of shoes out of one million will need replacement before 36
months? - ANSWERS-308,537
A standard normal distribution has a mean of_______ and standard
deviation of _________. - ANSWERS-Zero, One
The area under the normal curve between z=0 and z=1 is_________ the
area under the normal curve between z=1 and z=2. - ANSWERS-greater
than
