Data, Sampling, and Variation in Data and Sampling · Exercise 26

Use the following data to answer the next five exercises: 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 asked to use the software program twice a day, once in the morning, and once in the evening. The studies observed 200 stroke patients recovering over a period of several weeks. The first study collected the data in. The second study collected the data in.
$$\begin{array}{cccc}\text{Group}& \text{Showed Improvement}& \text{No Improvement}& \text{Deterioration}\\ \text{Used program}& \text{142}& \text{43}& \text{15}\\ \text{Did not use program}& \text{72}& \text{110}& \text{18}\end{array}$$
$$\begin{array}{cccc}\text{Group}& \text{Showed Improvement}& \text{No Improvement}& \text{Deterioration}\\ \text{Used program}& \text{105}& \text{74}& \text{19}\\ \text{Did not use program}& \text{89}& \text{99}& \text{12}\end{array}$$

The first study was performed by the company that designed the software program. The second study was performed by the American Medical Association. Which study is more reliable?

Its source prints no answer for this problem, so there's nothing to check against.

OpenStax, Statistics · §1.2 Data, Sampling, and Variation in Data and Sampling · Exercise 26