University:
McNeese State University
Course:
MATH 231 | Elementary Probability and Statistical Inference
Academic year:

2024
Views:

332

Pages:

1
Author:

Tori K.

Math 231 1-3 Data Collection and Experimental Design Baldwin Another type of experimental design is a matched-pair design, where subjects are paired up according to a similarity. One subject in each pair is randomly selected to receive one treatment while the other subject receives a different treatment. Sample size, which is the number of subjects in a study, is another important part of experimental design. Replication is the repetition of an experiment under the same or similar conditions. Ex 2: A company wants to test the effectiveness of a new gum developed to help people quit smoking. Identify a potential problem with the given experimental design and suggest a way to improve it. 1. The company identifies ten adults who are heavy smokers. Five of the subjects are given the new gum and the other five subjects are given a placebo. After two months, the subjects are evaluated, and it is found that the five subjects using the new gum have quit smoking. size is not The sample experiment must be Large replicated enough to the improve , . Validity 2. The company identifies one thousand adults who are heavy smokers. The subjects are divided into blocks according to gender. Females are given the new gum and males are given the placebo. After two months, the female group has a significant number of subjects who have quit smoking. The have or groups a are greater not similar . effect or men . The subjects Viceversa but then , within by gender they the , should be treatment Te can gua new than be each , could women divided , block randomly assigned < to group A census is a count or measure of an entire population. Taking a census provides complete information, but it is often costly and difficult to perform. A sampling is a count or measure of part of a population and is more commonly used in statistical studies. To collect unbiased data, a researcher much ensure that the sample is representative of the population. Appropriate sampling techniques must be used to ensure the inferences about the population are valid. 3