STATISTICS BEC1 STATISTICS FINAL EXAM
SOLUTIONS WGU COMPREHENSIVE TEST
BANK 2026 FULL QUESTIONS AND
SOLUTIONS GRADED A+
⩥ What is the difference between stepwise methods versus the standard
approach and hierarchical methods of selecting independent variables to
include in a linear regression model? Answer: Stepwise uses statistical
criteria for selecting the variables to be included, whereas the other
approaches use theoretical rational.
⩥ The hypotheses of the study should. Answer: state the expected
relationship between the variables.
⩥ The process for testing hypotheses includes which of the following?
Answer: Define significance level.
Compute the test statistic.
Compute the parameters that are being compared by the test statistic.
Obtain the p-value of computed statistic.
Make sure the data meet the necessary assumptions to compute the test
statistic.
, ⩥ The _______ can be used to test whether the sample mean is
significantly different from a population mean. Answer: one-sample z-
test
⩥ How would you interpret a correlation coefficient of -1? Answer:
Perfect negative correlation—as one variable increases, the other
variable decreases
⩥ A research study needs to be well planned before starting. A common
mistake seen in research is Answer: failing to recognize approach
limitations
⩥ Linear regression is appropriate for what type of dependent variable?
Answer: Ratio scale and normally distributed
⩥ A pediatrician will compare the 6-week-old infant with the accepted
normal growth progress using the Answer: percentile rank
⩥ The scatter plot below presents data on children's mid-upper arm
circumference and their mother's weight. How would you describe the
correlation? Answer: There is a positive correlation
⩥ The normal distribution is a frequency polygon that demonstrates
which of the following properties? Answer: Mean, median, and mode
are equal.
SOLUTIONS WGU COMPREHENSIVE TEST
BANK 2026 FULL QUESTIONS AND
SOLUTIONS GRADED A+
⩥ What is the difference between stepwise methods versus the standard
approach and hierarchical methods of selecting independent variables to
include in a linear regression model? Answer: Stepwise uses statistical
criteria for selecting the variables to be included, whereas the other
approaches use theoretical rational.
⩥ The hypotheses of the study should. Answer: state the expected
relationship between the variables.
⩥ The process for testing hypotheses includes which of the following?
Answer: Define significance level.
Compute the test statistic.
Compute the parameters that are being compared by the test statistic.
Obtain the p-value of computed statistic.
Make sure the data meet the necessary assumptions to compute the test
statistic.
, ⩥ The _______ can be used to test whether the sample mean is
significantly different from a population mean. Answer: one-sample z-
test
⩥ How would you interpret a correlation coefficient of -1? Answer:
Perfect negative correlation—as one variable increases, the other
variable decreases
⩥ A research study needs to be well planned before starting. A common
mistake seen in research is Answer: failing to recognize approach
limitations
⩥ Linear regression is appropriate for what type of dependent variable?
Answer: Ratio scale and normally distributed
⩥ A pediatrician will compare the 6-week-old infant with the accepted
normal growth progress using the Answer: percentile rank
⩥ The scatter plot below presents data on children's mid-upper arm
circumference and their mother's weight. How would you describe the
correlation? Answer: There is a positive correlation
⩥ The normal distribution is a frequency polygon that demonstrates
which of the following properties? Answer: Mean, median, and mode
are equal.
