1.2 Measuring Scientifically Flashcards
How is the length of a certain object measured using the metric system?
Length is measured in meters (m).
What is the difference between mass and volume?
Mass is the amount of matter in an object. On the other hand, volume is the amount of space an object occupies.
What is the definition of temperature?
The amount of energy a particle has
How are mass and volume measured in the metric system?
Mass is measured using kilograms (kg). Volume is measured using liters (L).
What is the fraction form of the metric prefix “milli-“?
1 / 1,000
List the most common metric prefixes from largest to smallest.
“kilo-“, the base measurement, “centi-“, “milli-“, “mico-“, “nano-“, “pico-“
How does an object’s recorded measurement relate to the ruler’s markings?
The smaller and more precise the increments of measure are, the more digits will be recorded. For example, when using a ruler with 10 cm markings, a scientist would only record a whole number. In comparison, when using a ruler with 0.1 cm markings, a scientist would go to the hundredth place (two digits behind the decimal point).
Explain how mode, median, and mean are calculated.
Mode is the most common number in a data set. The median is the middle number of the data set. Lastly, the mean is the average of the data set. The mean is calculated by taking the sum of the terms and dividing that by the total amount of terms.
What is standard deviation?
Standard deviation is the measure of variation from the mean in a certain data set.
Why is standard deviation important?
The standard deviation shows the scientist and readers how precise the data is. For example, if a data set has a smaller standard deviation, this means that all of the values tend to be closer to the mean. This also shows that the data set is more reliable. The opposite applies to data sets that have larger standard deviations.
How do you find standard deviation?
The first step is to find the mean. Next, you should find the variance of each data point. After that, take each difference, square it, then average the result. Finally, take the square root of the variance.
Find the mean, median, and mode of the following data set:
6, 15, 45, 15, 19, 20
Mean: 20
Median: 17
Mode: 15
Find the standard deviation for the following data set:
6, 15, 45, 15, 19, 20
- Mean: 20
- Variance: 174.4
- Standard Deviaiton: 13.21
What is the difference between an independent and a dependent variable?
An independent variable is a variable that the scientist controls. Meanwhile, the dependent variable’s value is based on the results of the scientific experiment. The independent variable is placed on the x-axis, and the dependent variable is placed on the y-axis
Write a procedure for how to draw a graph with a data set that is given.
First, identify the variables. Which one is the dependent variable? Which is the independent variable? Using this information, determine the placement of each variable on the axes. Next, determine the graph scales for both axes. Make sure the increments are spread out and consistent. Afterward, plot each data value with a dot and determine your best-fit line by following the data points. Lastly, don’t forget to add a title!
True or False? If the statement is false, correct it. Temperature is measured with Fahrenheit when using the metric system.
False. In the metric system, temperature is measured using Celcius, and sometimes Kelvin.
True or False? If the statement is false, correct it. When using a ruler with 1 cm markings, you should record to the nearest tenth.
True.
Determine the independent and dependent variable based on the situation:
Angela wants to know if the type of detergent affects the cleanliness of her clothes.
Independent Variable: type of detergent used
Dependent Variable: cleanliness of clothes
Give an example of a direct relationship.
The relationship between the height from which a ball was dropped to the height that the ball bounces back is an example of a direct relationship.
True or False? If the statement is false, correct it.
When finding the standard deviation, you should find the mean, find the variance, take each difference, square it, and then average the result.
False. The average of the squared variances is not the standard deviation. You also have to square root the variance before submitting your answer.
How many mm are in 5.2 nm?
0.0000052
How many μm are in 2.3 cm?
23,000
Find the mean, median, and standard deviation of the set of test scores below:
61, 78, 80, 85, 95
Median: 80
Mean: 79.8
Standard Deviation: 11.09
The amount of matter that an object contains is ____ and is measured in _____.
a. volume, liters
b. volume, grams
c. mass, liters
d. mass, grams
d. mass, grams
