Time left 1:14:40 Which of the following approaches can help improve the external validity of an experiment? a. Equalizing the effect of nuisance variables. b. Maintaining the constant effect of nuisance variables. c. Employing a sample that represents the population. d. Randomly assigning participants to treatment groups. Time left 1:14:31 In the context of experimental design, which one of the following factors does not impact the internal validity of an experiment? a. Presence of selection bias. Random assignment of participants to treatment groups. c. Implementing a control group. Using a representative sample of the population. Time left 1:14:25 In a weight loss program, 60 participants were randomly divided into two equal-sized groups. One group followed a program that involved a low-carb diet, while the other group followed a program that involved a low-fat diet. After 12 weeks of training, 42 participants remained 30 in the low- carb diet group and 12 in the low-fat diet group. The results indicated that weight loss in the low- carb diet group was significantly greater than that in the low-fat diet group. A criticism of this experiment is that the findings may be biased by the effect of: a. Selection bias. b. Regression to the mean. c. Attrition. d. History. Time left 1.14.19 When conducting an experiment, incorporating a control group and employing random assignment of participants to treatments serves to mitigate potential threats to internal validity originating from: O a. Loss of participants during the study. O b. Biased selection of participants. O c. Influence of researchers' personal biases. O d. Unwanted effects resulting from repeated assessments.Time left 114:12 A study investigating the impact of a new medication on pain levels in patients over a six-month period, that collected data on pain intensity before and after treatment, would be most accurately classified as a: a. Mixed design. b. Between-subject design. c. Within-subjects design. d. Quasi-experimental design. Time left 1:14:06 If we need to evaluate the efficacy of a drug treatment, compared to a placebo control treatment, one disadvantage of using a between-groups design is: There are irreversible changes arising from one of the treatments. b. There is a carryover effect from one treatment to another. Treatment duration is longer (e.g., 20 weeks). d. Uneven participant characteristics between groups may impact internal validity. t of The Analysis of Variance (ANOVA) is used to examine differences among: The proportions of the groups. b. The variances within each group. c. The means of the groups. d. The relationships between variables in the sample. Time left 1:13:59 red d out of on In a one-way ANOVA, the effect size is given by the: 3 Mean square of the effect. b. Sums of squares of the effect. & eta-squared value. d. F value. Time left 1:13:54 Time left 1:13:49 In an experiment investigating the impact of four different study techniques on exam scores, the obtained Fvalue in a one-way ANOVA is computed as 2.610. This shows that: d out of O a. The result is statistically significant. O b. The study techniques lead to varying outcomes. O c. The within-group variance is smaller compared to the between-group variance. O d. Follow-up post-hoc tests are necessary due to the Fvalue exceeding 1.96