Table of contents

1. Intro to Stats and Collecting Data1h 14m
2. Describing Data with Tables and Graphs1h 55m
3. Describing Data Numerically1h 45m
4. Probability2h 16m
5. Binomial Distribution & Discrete Random Variables2h 33m
6. Normal Distribution and Continuous Random Variables1h 38m
7. Sampling Distributions & Confidence Intervals: Mean1h 53m
8. Sampling Distributions & Confidence Intervals: Proportion1h 12m
- Sampling Distribution of Sample Proportion
  29m
- Confidence Intervals for Population Proportion
  42m
9. Hypothesis Testing for One Sample2h 19m
10. Hypothesis Testing for Two Samples3h 26m
11. Correlation1h 6m
12. Regression1h 50m
13. Chi-Square Tests & Goodness of Fit1h 57m
14. ANOVA1h 57m

1. Intro to Stats and Collecting Data

Intro to Stats

Statistics

1. Intro to Stats and Collecting Data

Intro to Stats

Previous problemNext problem

2:32 minutes

Problem 1.r.24

Textbook Question

Identify the sampling technique used, and discuss potential sources of bias (if any). Explain.
A student asks 18 friends to participate in a psychology experiment.

Verified step by step guidance

Identify the sampling technique: The student is selecting participants based on convenience, as they are asking their friends. This is an example of a convenience sampling technique.

Explain convenience sampling: Convenience sampling involves selecting individuals who are easiest to reach or readily available. It is not random and does not ensure that every individual in the population has an equal chance of being selected.

Discuss potential sources of bias: Since the sample consists only of the student’s friends, it is not representative of the broader population. This introduces selection bias, as the sample may share similar characteristics (e.g., age, interests, or social background) that do not reflect the diversity of the entire population.

Explain the impact of bias: The lack of representativeness can lead to results that are not generalizable to the entire population. For example, conclusions drawn from this experiment may only apply to the student’s social circle and not to other groups.

Suggest improvements: To reduce bias, the student could use a random sampling technique, such as simple random sampling, where participants are chosen randomly from the entire population of interest. This would increase the likelihood of obtaining a representative sample.

Verified video answer for a similar problem:

This video solution was recommended by our tutors as helpful for the problem above

Video duration:

Play a video:

Was this helpful?

Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Sampling Technique

Sampling technique refers to the method used to select individuals from a population to participate in a study. In this case, the student is using a non-probability sampling technique known as convenience sampling, as they are selecting friends who are readily available rather than randomly selecting from the entire population.

Bias in Sampling

Bias in sampling occurs when certain members of a population are systematically more likely to be selected than others, leading to results that may not be representative. In this scenario, the potential bias arises from the fact that the sample consists only of friends, which may not reflect the broader population's diversity in terms of demographics, opinions, or behaviors.

Generalizability

Generalizability refers to the extent to which findings from a sample can be applied to the larger population. Due to the convenience sampling method and potential biases, the results of the psychology experiment may lack generalizability, making it difficult to draw conclusions that apply to individuals outside of the student's friend group.

Previous problemNext problem

2:13m

Watch next

Master Introduction to Statistics Channel with a bite sized video explanation from Patrick

Start learning

Related Videos

Related Practice

Textbook Question

Determine whether the data are qualitative or quantitative, and determine the level of measurement of the data set.

Census Regions The four geographical regions of the United States recognized by the U.S. Census Bureau are listed.

Northeast, South, Midwest, West

views

Textbook Question

Determine whether the data are qualitative or quantitative, and determine the level of measurement of the data set.

The top six final scores at the 2021 U.S. Women’s Figure Skating Championships are listed. (Source: NBC Sports)

232.61 215.33 214.98 213.39 199.95 178.89

views

Textbook Question

What is the difference between a census and a sampling?

views

Textbook Question

200 students volunteer for an experiment to test the effects of sleep deprivation on memory recall. The students will be placed in one of five different treatment groups, including the control group.

Explain how you could design an experiment so that it uses a completely randomized design.

views

Textbook Question

Identify the sampling technique used, and discuss potential sources of bias (if any). Explain.

Law enforcement officials stop and check the driver of every third vehicle for blood alcohol content.

views

Textbook Question

Determine whether the statement is true or false. If it is false, rewrite it as a true statement.

A double-blind experiment is used to increase the placebo effect.

views

Textbook Question

Determine whether the statement is true or false. If it is false, rewrite it as a true statement.

The method for selecting a stratified sample is to order a population in some way and then select members of the population at regular intervals.

views

Textbook Question

You want to know the favorite spring break destination among 15,000 students at a university. Determine whether you would take a census or use a sampling. If you would use a sampling, determine which sampling technique you would use. Explain your reasoning.

views

Show more practices