SCIE 211 Lab 2: Measurements and Significant Figures Worksheet Pre-lab Questions: 1. Define accuracy and precision: 2. Based upon the gradations on the ruler in the picture below, what is the length of the arrow? How many decimal places should your measurement include? 0000000 0 1 2 2 4 3 G 7 a 9 10 cm 3. Adata set contains the following measurements: 13.22, 13.48 cm, 13.49 cm, 13.49, 13.50 a. Calculate the mean and standard deviation for the data set. b. Based upon the values in this data set, do you think the mean or the median would be a better estimation of the center of the data set? Explain. 4. A wall in your living room is 23.35 ft long and 15.23 ft high. a. Calculate the area of the wall (Area = length x height) b. Report your answer using the correct number of significant figures. Data Charts: Insert a picture of your metric measuring tool. Based upon your measuring device, how many decimal places should each of your measurements include? Measurements: Length Object 1 - Large (table, couch, etc.) Identify the object: Trial # Measurement (Measurement - mean) | (Measurement - mean)- (cm) (cm) cmy mean X Standard deviation Measurements: Length Object 2 - Medium (book, cookie sheet, etc.)Identify the object: Trial # | Measurement | (Measurement - mean) | (Measurement - mean [cm) {cm) ] + ! | 2 s men | [ x | C Sadwddedaor | Measurements: Length Object 3 - Small (matchbox car, penny, etc.) Identify the object: Trial # | Measurement | (Measurement - mean) | (Measurement - mean (cm) {cm) (cm?) R I N R I R e | x| C Sedwddedor | Calculating Volume: Identify the object: Width R I I R : v ] s ] mean | ] Volume (cm): Post-lab Questions: 1. Based upon your results, what effect (if any) does the size of the object have on the standard deviation for your measurernent? 2. Choosing the proper measuring device for the "job" is important. Was using a standard metric ruler the best measuring device for the large object? If not, what tool would have been a better choice? 3. Did you have any outliers in your data set? How do you know (i.e. how do you determine if a data point is an outlier)? 4. You were easily able to calculate the volume of a regularly shaped object. How might you determine the volume of an object if it has an irregular shape? Would you need a different measuring tool