91Ó°ÊÓ

For each of the statistical studies described, indicate whether the study is an observational study or an experiment. Give a brief explanation for your choice. The article "Baby Scientists Experiment with Everything" (The Wall Street Journal, April 18,2015 ) describes a series of studies published in the journal Science. In one of these studies, 11 -month old children were assigned to one of two groups. The children in one group were shown a ball behaving as expected, such as rolling into a wall or falling off an edge. The children in the other group were shown a ball behaving in an unexpected way, such as rolling through what appeared to be a solid wall or rolling off an edge and remaining suspended in the air. The children were then given a ball and another toy. The researchers found that the children in the group that saw the ball behaving as expected showed no preference for the ball over the other toy, but that the children who saw the ball behaving in an unexpected way tended to choose the ball, and that they also played with it differently and tested the ball's behavior by dropping it or rolling it.

Step by step solution

01

Determine if manipulation occurs

In this study, the ball's behavior is being manipulated by researchers to observe the children's reactions. The manipulation of this variable makes the study an experiment. #Step 2: Provide a brief explanation# A brief explanation for the choice of classification should highlight the main aspects of the study that determine its type.

02

Compare the study to an observational study and an experiment

This study is an experiment because researchers purposely manipulate the behavior of the ball to see if it affects the children's preference and play behavior. In an observational study, there would be no manipulation of variables, and researchers would simply gather data without altering any conditions. #Step 3: Provide a conclusion# We can conclude with a concise statement that confirms the type of study and includes a brief reason for this classification.

03

Summarize the findings

This study is an experiment because researchers are intentionally manipulating the ball's behavior to observe the potential effects on the children's preferences and play behavior.

Unlock Step-by-Step Solutions & Ace Your Exams!

• Full Textbook Solutions

  Get detailed explanations and key concepts

• Unlimited Al creation

  Al flashcards, explanations, exams and more...

• Ads-free access

  To over 500 millions flashcards

• Money-back guarantee

  We refund you if you fail your exam.

Over 30 million students worldwide already upgrade their learning with 91Ó°ÊÓ!

Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Observational Study

An observational study is one where researchers observe subjects in their natural environment without interfering. This approach aims to collect data and establish correlations between variables while maintaining the integrity of the real-world setting. For example, if scientists wanted to understand the diet patterns of wild animals, they might set up cameras or observe from a distance, carefully documenting the types of foods consumed without altering the animals' choices or behaviors. The key aspect of observational studies is the lack of interference or control exerted by the researchers over the variables of interest. This method is excellent for studying behaviors and outcomes as they naturally occur, but it cannot infer causation due to the potential presence of confounding factors.

Experiment

In contrast to observational studies, experiments involve deliberate manipulation of variables to determine cause-and-effect relationships. They are designed with at least two groups: a control group and an experimental group. By changing one or more variables in the experimental group and comparing the outcomes with the control group, researchers can evaluate the effects of those changes.

An example of an experiment is a clinical trial to test the effectiveness of a new medication. Patients are randomly assigned to either receive the medication or a placebo, and their health outcomes are measured and compared. By systematically altering the treatment variable and controlling other factors, experiments can identify cause-and-effect links with more certainty than observational studies.

Variable Manipulation

Variable manipulation is a cornerstone of experimental research. It involves intentionally changing one or more independent variables to examine the subsequent effect on dependent variables. The process of manipulation needs to be carefully planned and executed to ensure the validity of the experiment.

For example, when studying plant growth, a researcher might manipulate the variable 'amount of water provided' to see its effect on plant height (a dependent variable). This method is critical for establishing causal relationships because it isolates the specific factors that are responsible for observed changes, thus ruling out other potential explanations.

Data Collection Methods

Data collection methods are diverse and need to be suited to the research question and type of study being conducted. Common methods include surveys, interviews, observations, and experiments. In surveys, participants are asked to respond to questions, which can be done through questionnaires or interviews, allowing researchers to gather large amounts of data efficiently. Observation, often used in observational studies, is the systematic documentation of behaviors or events as they naturally occur.

Furthermore, modern technology has introduced innovative data collection methods, such as wearable devices that gather physiological data, and social media analytics for behavioral studies. The chosen method should aim for accuracy, reliability, and relevance to the study's objectives, ensuring that the gathered information adequately reflects the phenomena under investigation.