Question

planning an investigation reading passage
date:
https://bit.ly/3bim6md
planning an investigation
an investigation is a scientific experiment. scientists conduct experiments to answer questions about the natural world. there is a lot that goes into planning and conducting an experiment. how the experiment is planned and performed affects the reliability of the results. scientists must consider the variables, experimental groups, sample size, number of trials and how you record data when designing the investigation.
scientists must identify the variables in the experiment. variables are factors in an experiment. in a good experiment, a scientist changes only one variable. all other variables in the experiment are kept constant or the same. changing only one variable ensures that the scientist is truly testing the change in that factor.
once the variables are identified, scientists create different groups in the experiment. each group receives a different amount or type of the variable you are changing. these groups are called experimental groups. in a well - controlled experiment, you have multiple experimental groups and a control. a control is a group that provides a “baseline” to compare your experimental groups. it doesn’t receive the variable you are changing or it receives the most “normal” conditions.
a good experiment has a large sample size and multiple trials. the sample size is the number of test subjects used in the experiment. a trial is a run of the experiment. in a good experiment, scientists perform at least three trials of the same experiment. a large sample size and multiple trials help reduce errors and produce more accurate results.
scientists gather and record data in an organized way in a good experiment. scientist record observations and measurements in a notebook or table so that after the experiment, they can better analyze the data.

Explanation:

Since no specific question is provided about this passage, it's hard to give a targeted answer. If you have questions like explaining a concept (e.g., what a control group is), analyzing the text structure, or answering comprehension questions, please specify so that I can assist you using the appropriate format (A or B) based on the nature of the question.

Answer:

Since no specific question is provided about this passage, it's hard to give a targeted answer. If you have questions like explaining a concept (e.g., what a control group is), analyzing the text structure, or answering comprehension questions, please specify so that I can assist you using the appropriate format (A or B) based on the nature of the question.