List the steps required to conduct an experiment.

Question

Accepted Answer

Hello there. Today we are going to solve the following practice problem together. So first off, let us read the problem and highlight all the key pieces of information that we need to use in order to solve this problem. Which of the following lists the best chronological order of major actions to perform when planning and executing a randomized controlled experiment? OK. So it appears for this particular problem we're given 4 different multiple choice answers, and we're asked to identify which of our multiple choice answers. Best lists the chronological order of major actions to perform when planning and executing a randomized controlled experiment. So that's our key term here that we need to focus on is randomized controlled experiment. So now that we know what we're ultimately trying to solve for, let's take a moment to read off our multiple choice answers to see what our final answer may be. A is obtain ethical approval, 2 pilot test protocol, to randomly assigned participants to conduct experiment to clean data, analyze and report results. B is state hypotheses and choose variables to determine sample size via power analysis to obtain ethics approval to pilot test protocol to conduct experiment to clean data and analyze. C is conduct experiment to state hypotheses to randomly assign participants to analyze data to report results. And finally, D is choose experimental design to conduct experiment to determine sample size, to obtain approvals to analyze data. OK. So our first step that we need to take in order to solve this problem is we need to recall the following rule. So we need to recall and define the research question and hypothesis using the scientific method, state the null and alternative hypotheses. So that's our step one. So, essentially, whenever we're performing any sort of experiment or any sort of research, we need to note that we need to identify the research question and the hypothesis using the scientific method and state the null and alternative hypotheses. So with that in mind, our second step now is we need to recall and identify variables and choose measurements by naming independent, dependent, and control variables. Our third step that we need to take is we need to recall and determine sample size using a power analysis, and by recalling and using the following formula which states that lowercase n is equal to parenthesis Z subscript alpha divided by 2 plus Z subscript beta. And this Z subscript alpha divided by 2 plus Z subscript beta will be to the power of 2 multiplied by sigma to the power 2 all divided by delta to the power of 2, and we then after this, as we should recall, we now then need to apply the formula to set our value for N. Fantastic. So for our 4th step now, we need to recall that we need to obtain ethical approval and informed consent following the institutional review board procedures, and then we need to secure, once again, we need to secure approvals before we even begin data collection. This is very important. We need to secure our approvals before we begin data collection. So with that in mind, our 5th step now is we at this stage, we need to recall that we need to apply the pilot test in order to once again we're doing the pilot test to Which is part of our protocol on a small sample to check instructions and measurements, and then we need to revise the materials as needed. So at this stage we need to perform the pilot test in order to check protocol on a small sample in order once again to check instructions and measurements, and then once we perform the pilot test, we need to revise materials as needed. So our 6th step now, at this point, as we should recall, is we need to randomly assign participants to conditions using randomized procedures to protect internal validity, and then we need to implement the assignment before running the full experiment. So once again, we need to implement the assignment before running the full experiment in its entirety. So, with that in mind, Our 7th step now, so this is step number 7, we need to note and recall at this stage at this point we need to conduct the experiment following the standardized protocol and moder fidelity, and at this point we need to collect raw data. Or step number 8, as we should recall, we need to clean and preprocess the data by handling missing values and considering outliers, and then we need to verify assumptions and lastly we need to prepare the data for analysis. And for our 9th and final step, as we should recall, we now need to analyze the data using the pre-specified statistical methods and report the effect sizes and uncertainty, and we then at this point we need to interpret and report our final results. So, with this in mind, our final answer without a doubt will have to be multiple choice answer letter B, because out of the all of the multiple choice answers, it is the only one that like correctly has the chronological order. So out of all of our multiple choice answers, it's the only one that has the correct chronological order. So chronological order for a randomized controlled experiment. So B is one. Again, state hypotheses and choose variables to determine sample size via power analysis to obtain ethics approval to pilot test protocol, to conduct experiment, to clean data and analyze, and that's it. We've officially solved for this problem. Thank you so much for watching. Hopefully that helped, and I can't wait to see you in the next video. Bye.

List the steps required to conduct an experiment.

Key Concepts

Formulating a Hypothesis

Designing the Experiment

Data Collection and Analysis

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