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The article "Yes that Miley Cyrus Biography Helps Learning" (The Globe and Mail, August 5,2010 ) describes an experiment investigating whether providing summer reading books to low-income children would affect school performance. Subjects in the experiment were 1300 children randomly selected from first and second graders at low-income schools in Florida. A group of 852 of these children were selected at random from the group of 1300 participants to be in the book group. The other 478 children were assigned to the control group. Children in the book group were invited to a book fair in the spring to choose any 12 reading books that they could then take home. Children in the control group were not given any reading books, but were given some activity and puzzle books. These children received books each year for three years until the children reached third and fourth grade. The researchers then compared reading test scores of the two groups. a. Is randomly selecting 852 of the 1300 children to be in the book group is equivalent to random assignment of the two experimental conditions to subjects? Explain. b. Explain the purpose of including a control group in this experiment.

Step by step solution

01

Evaluate if 852 randomly selected children for the book group is equivalent to random assignment.

The experiment started with 1300 children as subjects. 852 of these children were randomly selected to be in the book group, while the other 478 children were assigned to the control group. The question asks if this random selection process is equivalent to random assignment of the two experimental conditions (book group and control group) to subjects. Random assignment means that each subject has an equal chance of being assigned to either the book group or the control group. In this case, since 852 children were randomly selected from the 1300 participants to be part of the book group, it suggests that there was a random assignment of the two experimental conditions to the subjects. So, the answer is yes. Randomly selecting 852 of the 1300 children to be in the book group is equivalent to random assignment of the two experimental conditions to subjects. #Step 2: Purpose of the control group#

02

Explain the purpose of including a control group in this experiment.

The purpose of including a control group in an experiment is to provide a baseline or a standard to compare the effects of the experimental treatment. In this case, the experimental treatment is providing summer reading books to low-income children. The control group is composed of children who were not given any reading books but were given some activity and puzzle books instead. By including a control group, researchers can compare the reading test scores of children in the book group with those in the control group. This way, they can determine if the reading books provided to the book group have any impact on the children's school performance, compared to children who did not receive reading books. Including a control group helps eliminate any confounding factors or biases that may affect the outcome of the experiment, improving its validity and reliability.

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Key Concepts

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

Experimental Design

Experimental design is a critical component in conducting scientific research, particularly because it sets the groundwork for how a study will be conducted to assess a hypothesis. It includes planning the method to collect data, the selection of the subject pool, the assignment to different groups, and the measurement of outcomes.

For instance, in the educational research example given, experimental design was crucial in answering the question of whether providing summer reading books to children affects school performance. The researchers selected a sample of low-income first and second graders and then randomly assigned them to two groups – a book group and a control group. The design accounted for random assignment, which allowed each child an equal chance of being in either group, thereby aiming to reduce selection bias.

This balanced approach is key in isolating the specific impact of the intervention (in this case, reading books) on the outcome measure (school performance). By controlling for extraneous factors, the design aims to attribute differences in performance to the presence or absence of the books, not to other variables.

Control Group

A control group is a baseline standard in experiments that serves as a comparison for the group receiving the treatment – in educational studies, often labeled as the 'experimental group'. The purpose of the control group is to measure what occurs without the experimental intervention, effectively acting as a benchmark against which the effects of the variable being tested can be compared.

In the reading study, the control group was the children who received activity and puzzle books instead of reading books. Using the control group, researchers could observe the test scores of these children, who did not receive the key intervention, and compare them to the scores of children who did receive reading books. If a significant difference in school performance is observed favoring the book group, it can be hypothesized that the reading books contributed to that difference. The rigidity of a control group is essential to infer causality and enhance the study's internal validity.

Impact of Reading on School Performance

Exploring the impact of reading on school performance is a common question in educational research due to the significant role literacy plays in learning across all subjects. Studies have shown that reading can improve vocabulary, comprehension, and critical thinking skills – all of which are foundational to academic success.

Through the exercise, we look at an experimental case wherein researchers gauged school performance by comparing reading test scores between children who were given books and those who were not. If findings reveal higher scores for the book group, this would support the claim that access to reading materials positively influences educational outcomes. This relationship between reading and school performance is central in educational policies and interventions aiming to close the achievement gap for low-income students.

Educational Research Methods

Educational research methods encompass a variety of techniques used to investigate questions related to learning, instruction, and education policy. This field often adopts methods from both the social sciences and the natural sciences to gather and interpret data. The approaches can be quantitative, qualitative, or mixed methods. Quantitative methods, such as the one used in the reading study, involve numerical data and statistical analysis.

Good educational research also considers ethical implications such as informed consent, confidentiality, and the potential impacts on participants. In the case of the textbook example, the study would have involved getting consent from the children's parents or guardians, protecting the children's identities, and ensuring there were no adverse effects from participating in the study.

In sum, educational research methods are designed to explore hypotheses about education rigorously, ensuring that findings can be trusted to inform educational decisions and policies.