BUAL 2650 Yan Exam 2 Questions &
Answers 2024/2025
what are matched pairs? - ANSWERSaka matched samples, they are paired up so that the participants
share every characteristic except for the one under investigation
If p < 0.10 - ANSWERSthere is SOME evidence to reject H0
If p < 0.05 - ANSWERSthere is STRONG evidence to reject H0
If p < 0.01 - ANSWERSthere is VERY STRONG evidence to reject H0
if p < 0.001 - ANSWERSthere is EXTREMELY STRONG evidence to reject H0
In testing the difference between the means of two normally distributed populations using independent
random samples with equal variances, the correct test statistic to use is the _________ - ANSWERST-test
when testing a hypothesis about the 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 ______ - ANSWERSt
when testing the difference between 2 population proportions using large independent random
samples, the _______ test statistic is used - ANSWERSz
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 _______ - ANSWERS9
D0 - ANSWERSa number whose value varies depending on the situation. Often D0 will be the number 0
Assumptions for t-test statistic - ANSWERS- independent samples
, - equal variances
- either normal populations OR large sample sizes
paired differences experiment - ANSWERSan experiment in which we have obtained 2 different
measurements on the same "n" units is called ________
ud (mu d) - ANSWERSthe mean of population of paired differences
dependent (response) variable - ANSWERSvariable we wish to understand/ predict
independent (predictor) variable - ANSWERSthe variable we will use to understand or predict the
dependent variable
regression analysis - ANSWERSa statistical technique that uses the observed data to relate the
dependent variable to one or more independent variables
B0 - ANSWERSthe Y-INTERCEPT
B1 - ANSWERSthe SLOPE
E (epsilon) - ANSWERSan error term that describes the effect on y of all factors other than x
Uy = B0 + B1*X+ E - ANSWERSthe mean value of the dependent variable y when the value of the
independent variable is x
r^2 - ANSWERS- simple coefficient of determination
- proportion of the total variation explained by the overall regression model
- r^2 = [0, 1]
- r^2= explained variation/ total variation
Answers 2024/2025
what are matched pairs? - ANSWERSaka matched samples, they are paired up so that the participants
share every characteristic except for the one under investigation
If p < 0.10 - ANSWERSthere is SOME evidence to reject H0
If p < 0.05 - ANSWERSthere is STRONG evidence to reject H0
If p < 0.01 - ANSWERSthere is VERY STRONG evidence to reject H0
if p < 0.001 - ANSWERSthere is EXTREMELY STRONG evidence to reject H0
In testing the difference between the means of two normally distributed populations using independent
random samples with equal variances, the correct test statistic to use is the _________ - ANSWERST-test
when testing a hypothesis about the 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 ______ - ANSWERSt
when testing the difference between 2 population proportions using large independent random
samples, the _______ test statistic is used - ANSWERSz
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 _______ - ANSWERS9
D0 - ANSWERSa number whose value varies depending on the situation. Often D0 will be the number 0
Assumptions for t-test statistic - ANSWERS- independent samples
, - equal variances
- either normal populations OR large sample sizes
paired differences experiment - ANSWERSan experiment in which we have obtained 2 different
measurements on the same "n" units is called ________
ud (mu d) - ANSWERSthe mean of population of paired differences
dependent (response) variable - ANSWERSvariable we wish to understand/ predict
independent (predictor) variable - ANSWERSthe variable we will use to understand or predict the
dependent variable
regression analysis - ANSWERSa statistical technique that uses the observed data to relate the
dependent variable to one or more independent variables
B0 - ANSWERSthe Y-INTERCEPT
B1 - ANSWERSthe SLOPE
E (epsilon) - ANSWERSan error term that describes the effect on y of all factors other than x
Uy = B0 + B1*X+ E - ANSWERSthe mean value of the dependent variable y when the value of the
independent variable is x
r^2 - ANSWERS- simple coefficient of determination
- proportion of the total variation explained by the overall regression model
- r^2 = [0, 1]
- r^2= explained variation/ total variation
