Planning Experiments and Data Analysis

What is the sample size in an experiment?

• How many times you test the variable in an experiment

• What is changed in an experiment

• It is the conclusion of the experiment

What are outliers in a data set?

• Outliers are data points that are always ignored in experimental results

• Outliers are data points that always improve the accuracy of experimental results

• Outliers are data points that significantly differ from the rest of the data .

True or False: Scientists use the smallest sample size possible in experiments because smaller sample sizes are more reliable

• True

• False

Tags

NGSS.MS-PS2-5

Which column on the data table indicates the independent variable? (what is changed in the experiment)

• Type of Bait

• One Hour

• Three Hours

What is the dependent variable? (what is measured in the experiment)

• Type of Bait

• Location

• Number of fish caught

A gardener wanted to test the effectiveness of pesticides on aphids. She applied the pesticide to four rose bushes and left four rose bushes without pesticide. She counted and recorded the number of aphids on the roses for four weeks.

What is the independent variable?

• the pesticide

• rain water

• rose bushes

A gardener wanted to test the effectiveness of pesticides on aphids. She applied the pesticide to four rose bushes and left four rose bushes without pesticide. She counted and recorded the number of aphids on the roses for four weeks.

What is the dependent variable?

• the pesticide

• the number of aphids

• rose bushes without pesticide

Tags

NGSS.MS-LS2-4

Explain the steps involved in calculating the average of a set of data points.

• Multiply each data point by 2 and then add them together

• Add up all the data points and then divide the sum by the total number of data points.

• Subtract the smallest data point from the largest data point

Why is it important to calculate the average of data points in scientific experiments?

• To waste time and resources

• To confuse other scientists

• It is important to understand the average value of the data, which can help in making comparisons, drawing conclusions, and making predictions.

Tags

NGSS.MS-PS3-1

Use the formula to calculate the average of this data set:

15, 20, 10, 15

• 15

• 18

• 20