Page(s) 33–34 How Do Psychologists Conduct Research? A psychologist designs an experiment on the effects of exam preparation strategy on long-term memory. She randomly assigns college students to one of three groups in the experiment. Group 1 studies using visual information only. Group 2 studies using auditory information only. Group 3 does not study at all. The students follow the instructions for how they must study for four days to prepare for a 100-question multiple-choice exam. They all study the same chapter in the textbook and all take the same exam. Exam scores are then recorded. Categorize each item from the experiment as a dependent variable, an independent variable, or neither.

1) The dependent variable is;

The recorded exam scores of the student

2) The independent variable items in the experiment are;

a) The method of study;

i) Through visual information only

ii) Using auditory information only

iii) Not studying at all

b) The duration of study

Four days

c) The number of questions in the exam

100-questions

Step-by-step explanation:

Dependent Variable

The dependent variable is the measured result of the experiment which are the values that change due to a change in the treatment applied in the experiment

The dependent variable is the output of the function of the experiment from an varied inputs to the experiment which is the independent variable

Independent Variable

The independent variable are the variable taken as the cause of the desired effect which is observed measured as the dependent variable

the correct option is 2.

step-by-step explanation:

according to the given information triangle abc is a right angle triangle with right angle at a. segment ab is 5 and segment ac is 7. point d is on segment bc and angles adb and adc are right angles.

it is given that triangles abd, cad, and cba are similar.

two triangles are similar if their corresponding sides are proportional.

in triangle cba, using pythagoras theorem

                      )

triangle abd and cba are similar,

                            (2)

triangle cad and cba are similar,

                      )

using (1), (2) and (3), we get

hence proved.

therefore option 2 is correct.

47 - 90 = 43

43 - 180 = x

x = 137