STRAIGHTERLINE BUSINESS STATS FINAL EXAM LATEST 2026 UPDATED
QUESTIONS AND VERIFIED 100% SOLUTIONS (2026/2027) |A+
GRADED |GUARANTEED PASS
A statistics professor wants to compare grades in two different classes of the same course. This
is an example of a paired sample. - Answers -False
To employ ANOVA, the populations being studied must be approximately normally distributed. -
Answers -True
The F distribution's curve is positively skewed. - Answers -True
In an ANOVA table, k represents the total number of sample observations and n represents the
total number of treatments. - Answers -False
For an ANOVA test, rejecting the null hypothesis does not identify which treatment means differ
significantly. - Answers -True
The alternative hypothesis used in ANOVA is H1: All population means are equal. - Answers -
False
If we want to determine which treatment means differ, we compute a confidence interval for
the difference between each pair of means. - Answers -True
1|Page
,One characteristic of the F distribution is that the computed F can only range between -1 and
+1. - Answers -False
To employ ANOVA, the populations should have approximately equal standard deviations. -
Answers -True
If a confidence interval for the difference between a pair of treatment means includes 0, then
we reject the null hypothesis that there is no difference in the pair of treatment means. -
Answers -False
If the computed value of F is 0.99 and the F critical value is 3.89, we would not reject the null
hypothesis. - Answers -True
One assumption underlying linear regression is that the X values are normally distributed. -
Answers -False
A scatter diagram is a graph that portrays the correlation between a dependent variable and an
independent variable. - Answers -True
The least squares technique minimizes the sum of the squares of the vertical distances between
the actual Y values and the predicted values of Y. - Answers -True
2|Page
,The hypothesis to test the slope of a regression equation is H0: α = 0. - Answers -False
Correlation analysis is a statistical technique used to measure the strength of the relationship
between two variables. - Answers -True
The coefficient of determination is the proportion of total variation in Y that is explained by X. -
Answers -True
The coefficient of determination is the square root of the coefficient of correlation. - Answers -
False
The regression equation is used to estimate a value of the dependent variable Y based on a
selected value of the independent variable X. - Answers -True
A confidence interval can be determined for the mean value of Y for a given value of X. -
Answers -True
The values of a and b in the regression equation are called the regression coefficients. - Answers
-True
3|Page
, An example of a dummy variable is "time to product's first repair" in years. - Answers -False
The multiple coefficient of determination, R2, reports the proportion of the variation in Y that is
not explained by the variation in the set of independent variables. - Answers -False
For a global test of a multiple regression equation, the F distribution is defined by the regression
and residual degrees of freedom. - Answers -True
Stepwise regression analysis is a method that assists in selecting the most significant variables
for a multiple regression equation. - Answers -True
Stepwise regression analysis is also called a "backward elimination" method. - Answers -False
If the hypothesis H0: β1= 0, is rejected, then the sample regression coefficient b1 indicates the
change in the predicted value for a unit change in X1 when all other Xi variables are held
constant. - Answers -True
A correlation matrix can be used to assess multicollinearity between independent variables. -
Answers -True
4|Page
QUESTIONS AND VERIFIED 100% SOLUTIONS (2026/2027) |A+
GRADED |GUARANTEED PASS
A statistics professor wants to compare grades in two different classes of the same course. This
is an example of a paired sample. - Answers -False
To employ ANOVA, the populations being studied must be approximately normally distributed. -
Answers -True
The F distribution's curve is positively skewed. - Answers -True
In an ANOVA table, k represents the total number of sample observations and n represents the
total number of treatments. - Answers -False
For an ANOVA test, rejecting the null hypothesis does not identify which treatment means differ
significantly. - Answers -True
The alternative hypothesis used in ANOVA is H1: All population means are equal. - Answers -
False
If we want to determine which treatment means differ, we compute a confidence interval for
the difference between each pair of means. - Answers -True
1|Page
,One characteristic of the F distribution is that the computed F can only range between -1 and
+1. - Answers -False
To employ ANOVA, the populations should have approximately equal standard deviations. -
Answers -True
If a confidence interval for the difference between a pair of treatment means includes 0, then
we reject the null hypothesis that there is no difference in the pair of treatment means. -
Answers -False
If the computed value of F is 0.99 and the F critical value is 3.89, we would not reject the null
hypothesis. - Answers -True
One assumption underlying linear regression is that the X values are normally distributed. -
Answers -False
A scatter diagram is a graph that portrays the correlation between a dependent variable and an
independent variable. - Answers -True
The least squares technique minimizes the sum of the squares of the vertical distances between
the actual Y values and the predicted values of Y. - Answers -True
2|Page
,The hypothesis to test the slope of a regression equation is H0: α = 0. - Answers -False
Correlation analysis is a statistical technique used to measure the strength of the relationship
between two variables. - Answers -True
The coefficient of determination is the proportion of total variation in Y that is explained by X. -
Answers -True
The coefficient of determination is the square root of the coefficient of correlation. - Answers -
False
The regression equation is used to estimate a value of the dependent variable Y based on a
selected value of the independent variable X. - Answers -True
A confidence interval can be determined for the mean value of Y for a given value of X. -
Answers -True
The values of a and b in the regression equation are called the regression coefficients. - Answers
-True
3|Page
, An example of a dummy variable is "time to product's first repair" in years. - Answers -False
The multiple coefficient of determination, R2, reports the proportion of the variation in Y that is
not explained by the variation in the set of independent variables. - Answers -False
For a global test of a multiple regression equation, the F distribution is defined by the regression
and residual degrees of freedom. - Answers -True
Stepwise regression analysis is a method that assists in selecting the most significant variables
for a multiple regression equation. - Answers -True
Stepwise regression analysis is also called a "backward elimination" method. - Answers -False
If the hypothesis H0: β1= 0, is rejected, then the sample regression coefficient b1 indicates the
change in the predicted value for a unit change in X1 when all other Xi variables are held
constant. - Answers -True
A correlation matrix can be used to assess multicollinearity between independent variables. -
Answers -True
4|Page
