Bio 111 Lecture 1 Homework 9

A properly designed experiment contains the following:   positive and negative controls and experimental conditions.   positive control and experimental conditions.   positive and negative controls   control and experimental

Explain how Observational Studies are different than Experiments. Be sure to describe the main purpose and goal for each of these research methods.

Identify the following parts of an experimental design, including the: control group, experimental group,independent variable, dependent variable, and constants/standardized variables

The 'control group' is an essential component of an experiment. This is because   1. A control group allows one to determine if a particular result is due to the experimental variable. 2. No, it's not essential in experimentation. A control group is not always necessary it depends on the experiment. 3. A control group allows for multiple variables to be tested at the same time. 4. A control group is required for the development of a prediction.

describe some aspects of experimental design that helpto ensure objective and reliable results

Why is it important to have a control for an experiment?

Discuss the relationship between accuracy of results, time, and money in scientific research. What conditions should researchers take into account when trying to balance these factors?

what is the difference between a quasi-experimental design and an experimental design

A controlled experiment O includes at least two groups, one differing from the other by two or more variables includes at least two groups, one of which does not receive the experimental treatment is repeated many times to ensure that the results are accurate includes one group for which the scientist controls all variables

Explain what Avery’s experiment showed in 1944. Briefly describe the idea behind the experimental set up. Mention the step by step findings and the conclusions.

Based on your observation and knowledge, what is the most important problem faced by the human being ? A disease, daily life issues, social issues etc (anything is possible!).Please define your research question or problem. Propose your solution with engineering or scientific approach. Use your imagination and innovative approach.

A controlled experiment is one that proceeds slowly enough that a scientist can make careful records of the results. tests experimental and control groups in parallel. is repeated many times to make sure the results are accurate. keeps all variables constant.

Instruction: Go outside and observe your surroundings. From your observation, formulate a hypothesis and design an experiment that will test your hypothesis. Provide a predicted result of your experiment.

 What is the dependent variable or what is being measured? what is the independent variable or what is being changed?

Explain the process of science in your own words using 3-4 complete sentences.  What is the difference between the experiment's control group and controlling for confounding variables?

Write a summary: Simply put, a lab report is a way to explain what you have done in an experiment. You describe theresults you obtained and then discuss what you learned. There are several ways to write a lab report,and depending on your class or your instructor, the requirements will vary. But this guide is to helpyou understand the reason why writing a lab report is an important part of the science process. It willalso introduce the basic structure of one type of write-up.In college, any science course you take will require you to do a lab report. But they are not just busywork. They actually serve a purpose. You see, a written report is one of the main ways to share information to other scientists. It communicates the major points of an investigation to others who are ina similar field. This is a systematic way to spread information!Lab reports have their own unique style and format, too. Though you may have been taught to writepoetically and with artistry, lab reports require…

What is the purpose of researcher?  What is the function of the background to the study in the research protocol? Is there a difference between research question and research hypothesis? Explain your response. What make a research innovative?

What do you call a sample that goes through all the steps of an experiment but is not exposed to the experimental variable? control group dependent variable independent variable all variables/groups are exposed to the experimental variable

Which of the following is the best definition of the term controlled variables? a) The variable is what is measured or recorded in the experiment. This is the variable in an experiment that the researcher can change and b) control A treatment level that is often used for comparison, it is usually zero or a c) natural level. d) The things in an experiment that are kept the SAME for every level of treatment. e) A statement explaining an observation.

What is a null hypothesis in experiments? How is a null hypothesis used in science experiments? Note: Provide an answer with 150-200 words

An independent variable is… Select one: typically not included in controlled experiments Factor being manipulated factor showing response variable held constant during an experiment

Based on your observation and knowledge, what is the most important problem faced by the human being? A disease, daily life issues, social issues etc. (anything is possible!). Please define your research question or problem. Propose your solution with engineering or scientific approach. Use your imagination and innovative approach.  Please dont available answer because it is wrong.

Explain the factors that affect the validity of experimental data (controls, bias, correlation, statistics).

The null hypothesis is: That the measured value is zero That the proposed model is not correct and the measured factors have no effect on the pattern That the proposed model is correct and perfectly explains the pattern That the experiment is null and void

Design a (hypothetical) experiment that adheres to the Scientific Method. Be sure to include all the necessary requirements at each step and give examples at all of the steps. Start with an observation, whether it's real or made up, state the null hypothesis, and design an experiment (including an experimental and control group, random sampling, sample size, and reproducibility) that will allow the student to reject or fail to reject the hypothesis, and state (hypothetical) 'actual' results and the appropriate conclusion to draw from those results.

Which of the following is not correctly linked?a. model: a representation of an object used in an experimentb. standard deviation: a form of statistical analysisc. principle: a theory that is not supported by experimental evidenced. data: the results of an experiment or observation

Refer to the section “The Big Picture: Experimental Design” a.  What is the purpose of a correlative (observational) study?b.  List two limitations of a correlative study.c.  What is the purpose of a causative (manipulative) study?

List the three types of variables that are taken into account when designing an experiment, and briefly define each in your own wrods.