Question

question #6
a researcher wants to determine effectiveness of a study tactic for memory recall. the researcher selects 100 participants. the 100
participants consist of 50 students with a gpa of 3.5 or higher and 50 students with a gpa below a 3.0. half of the students with a
gpa of 3.5 or higher are assigned to the treatment group and the other half are assigned to the control group. the process is
repeated for the students with a gpa of 3.0 or lower.

this is an example of a

matched pairs design
randomized comparative design
double blind
blocking design

question #7
in a study that measured intelligence, it was discovered that 11% of the participants with an iq of 85 or lower were left - handed. it is
known that 10% of the entire population of humans are left - handed.

are the results of this study statistically significant?

yes, because the results are likely to occur by random chance.
no, because the results are likely to occur by random chance.
no, because the results are unlikely to occur by random chance.
yes, because the results are unlikely to occur by random chance.

Explanation:

Question #6

• Matched Pairs Design: Usually involves pairs of subjects, not groups divided by GPA.
• Randomized Comparative Design: Focuses on random assignment without prior grouping by a variable like GPA.
• Double Blind: Relates to blinding of participants and experimenters, not mentioned here.
• Blocking Design: Groups (blocks) subjects by a variable (GPA here), then random assignment within blocks.

• Statistical significance means results are unlikely due to random chance.
• Here, 11% (sample) vs 10% (population) is a small difference. Such a small difference is likely to occur by random chance (not statistically significant).

Answer:

Blocking Design

Question #7