Question

4) A pair of studies was performed to measure the effectiveness of a new software program designed to help stroke patients regain their problem-solving skills. Patients were divided randomly into two groups. One group was asked to use the software program twice a day, once in the morning and once in the evening. Their progress was recorded and compared with the group that did not use the software. a) Is this an observational studies or an experiment? If it is and experiment name 2 elements that aided your decision. expc RIMent :One cRiment : one goup was asked to use the softwake pRogram twid day 0ther aRovup thot did no Se b) What are the explanatory and response variables? oftware CxPlanaTORY RespONse: c) Name two confounding variables. d) What is the population and sample in this problem?

Answer 1

4. A) i. A control group

ii. A treatment group

B) Explanatory: A new software

Response: the problem solving skills of stroke patients

C) In statistics, a confounder is a variable that influences both the dependent variable and independent variable, causing a spurious association.

So here two confounding variables are i. Age of patients and ii. The condition of stroke patients ( how much the patients have been impacted by the stroke)

D) Population: All stroke patients

Sample: Two groups of patients which are selected for the study