KRS 673 - Lesson 2.1

"FALSE"

"TRUE" or "FALSE"? A pretest of knowledge about microcomputers is given to a group of students 5 min prior to a film on the subject. A posttest given 10 min after the film showed a 10-point gain from the pretest. The researcher concludes that the film produced the gain. The threat to internal validity is likely to be maturation.

"FALSE"

"TRUE" or "FALSE"? A pretest of knowledge about microcomputers is given to a group of students 5 min prior to a film on the subject. A posttest given 10 min after the film showed a 10-point gain from the pretest. The researcher concludes that the film produced the gain. The threat to internal validity is likely to be statistical regression.

"TRUE"

"TRUE" or "FALSE"? A pretest of knowledge about microcomputers is given to a group of students 5 min prior to a film on the subject. A posttest given 10 min after the film showed a 10-point gain from the pretest. The researcher concludes that the film produced the gain. The threat to internal validity is likely to be testing.

"FALSE"

"TRUE" or "FALSE"? In experimental design, when comparisons are made of groups that have been selected on the basis of their extreme scores, the posttest means of the groups tend to move toward the mean of the entire population from which the extreme groups were selected. This threat to internal validity is called differential selection.

"FALSE"

"TRUE" or "FALSE"? In experimental design, when comparisons are made of groups that have been selected on the basis of their extreme scores, the posttest means of the groups tend to move toward the mean of the entire population from which the extreme groups were selected. This threat to internal validity is called experimental mortality. *d. statistical regression

"FALSE"

"TRUE" or "FALSE"? In experimental design, when comparisons are made of groups that have been selected on the basis of their extreme scores, the posttest means of the groups tend to move toward the mean of the entire population from which the extreme groups were selected. This threat to internal validity is called interaction of selection.

"TRUE"

"TRUE" or "FALSE"? In experimental design, when comparisons are made of groups that have been selected on the basis of their extreme scores, the posttest means of the groups tend to move toward the mean of the entire population from which the extreme groups were selected. This threat to internal validity is called statistical regression.

"FALSE"

"TRUE" or "FALSE"? Interviewers may become more skilled with practice, which could cause differences between the results of participants interviewed early in the study and those of participants interviewed later. This threat to internal validity is known as history.

"FALSE"

"TRUE" or "FALSE"? Interviewers may become more skilled with practice, which could cause differences between the results of participants interviewed early in the study and those of participants interviewed later. This threat to internal validity is known as testing.

"TRUE"

"TRUE" or "FALSE"? It is reasonable to expect volunteer participants to be similar in nature to other volunteers from similar populations.

"FALSE"

"TRUE" or "FALSE"? It is reasonable to expect volunteer participants to be similar in nature to other volunteers of a similar age.

"FALSE"

"TRUE" or "FALSE"? It is reasonable to expect volunteer participants to be similar in nature to paid participants from similar populations.

"FALSE"

"TRUE" or "FALSE"? It is reasonable to expect volunteer participants to be similar in nature to randomly selected participants from similar populations.

"FALSE"

"TRUE" or "FALSE"? Just before the posttest, students in the control group were shown a film in another class that related directly to the subject matter being studied in the treatment group. This represents a threat to internal validity known as maturation.

"FALSE"

"TRUE" or "FALSE"? Just before the posttest, students in the control group were shown a film in another class that related directly to the subject matter being studied in the treatment group. This represents a threat to internal validity known as selection bias.

"FALSE"

"TRUE" or "FALSE"? Just before the posttest, students in the control group were shown a film in another class that related directly to the subject matter being studied in the treatment group. This represents a threat to internal validity known as statistical regression.

"FALSE"

"TRUE" or "FALSE"? A pretest of knowledge about microcomputers is given to a group of students 5 min prior to a film on the subject. A posttest given 10 min after the film showed a 10-point gain from the pretest. The researcher concludes that the film produced the gain. The threat to internal validity is likely to be selection bias.

"FALSE"

"TRUE" or "FALSE"? A study is designed to determine whether the addition of programmed instruction will produce greater achievement scores than the traditional lecture-discussion method. Participants are randomly assigned to two instructional groups. Both groups are tested at the end of the experimental period. The most indicated statistical test is MANOVA.

"FALSE"

"TRUE" or "FALSE"? A study is designed to determine whether the addition of programmed instruction will produce greater achievement scores than the traditional lecture-discussion method. Participants are randomly assigned to two instructional groups. Both groups are tested at the end of the experimental period. The most indicated statistical test is Pearson r.

"FALSE"

"TRUE" or "FALSE"? Interviewers may become more skilled with practice, which could cause differences between the results of participants interviewed early in the study and those of participants interviewed later. This threat to internal validity is known as statistical regression.

"TRUE"

"TRUE" or "FALSE"? Just before the posttest, students in the control group were shown a film in another class that related directly to the subject matter being studied in the treatment group. This represents a threat to internal validity known as history.

"FALSE"

"TRUE" or "FALSE"? A study is designed to determine whether the addition of programmed instruction will produce greater achievement scores than the traditional lecture-discussion method. Participants are randomly assigned to two instructional groups. Both groups are tested at the end of the experimental period. The most indicated statistical test is factorial ANOVA.

"TRUE"

"TRUE" or "FALSE"? A study is designed to determine whether the addition of programmed instruction will produce greater achievement scores than the traditional lecture-discussion method. Participants are randomly assigned to two instructional groups. Both groups are tested at the end of the experimental period. The most indicated statistical test is t test.

"TRUE"

"TRUE" or "FALSE"? Interviewers may become more skilled with practice, which could cause differences between the results of participants interviewed early in the study and those of participants interviewed later. This threat to internal validity is known as instrumentation.

Double-blind experiment

DEFINITION An experiment in which neither the researcher nor the participants know which participants receive the experimental treatment.

Did the independent variable really produce a change in the dependent variable?

QUESTION The internal validity of an experimental design is concerned with what question?

Random assignment to groups

QUESTION The one characteristic of true experimental designs that preexperimental and quasi-experimental designs do not have is _______?