3/28/2023 0 Comments Line of best fit logger proYou can extinguish the Bunsen burner once you have 10. Measure the mass of the popped corn In experiment 2, on the apparatus, the distance from the bottom of the flame to the bottom of the evaporating dish should be about 8-10 inches so as to prevent _ of the kernals scorching In experiment 2, after you've lit the Bunsen burner and transferred an unpopped kernal to the evaporating dish, its important to heat the dish gently and keep the kernal in constant _ motion In experiment 2, your group needs 10 kernals that are all popped to about the same size. Pop the corn by allowing the water inside to turn to steam and expand the kernalģ. Measure the mass of several unpopped popcorn kernalsĢ. In _ you will see the topics and tools that you will need to finish this and other lab reports this semester (ex: definitions and equations of different items such as mean and standard deviation, rules for significant figures and rounding, etc.) _ provides a tutorial in the use of Excel Appendix iĪppendix II The popcorn kernals used in experiment 2 have or have not been stored in the first floor lab prep area? have Put the instructions for Experiment 2 in order. Independently the purpose of experiment 2 is to introduce you to statistical analysis and the tools necessary to analyze the data you will collect in other experiments this semester. to apply statistical tests to dara sets to determine if data points can be rejected (Q-test) and to determine statistical significance (t-test) For experiment 2, students complete the experiment in class _ but complete the rest of the assignment (calculations and questions) _ as a group to apply statistical formulae to calculate the mean and standard deviation of a data set For example, if you wanted to generate a line of best fit for the association between height and shoe size, allowing you to predict shoe size on the basis of a person's height, then height would be your independent variable and shoe size your dependent variable).What are expamples of dependent variables? absorbance reading, temperature, or pH measurement the "best fit" line does or does not have to go through all the data points? (this is typical when dealing with REAL data) does not Does the calculated line have to go through the origin (0,0)? no What is the correlation coefficient number for a perfect fit? 1.000 What correlation coefficient number should you be able to obtain? > 0.990 This is the average deviation of the individual data points from the calculated line RMSE (root mean square error) What is the purpose of experiment 2: Moisture Content of Popcorn? -to learn the basics of statisctical analysis that will be used throughout CHM 144 and 145 To begin, you need to add paired data into the two text boxes immediately below (either one value per line or as a comma delimited list), with your independent variable in the X Values box and your dependent variable in the Y Values box. This calculator will determine the values of b and a for a set of data comprising two variables, and estimate the value of Y for any specified value of X. The line of best fit is described by the equation ŷ = bX + a, where b is the slope of the line and a is the intercept (i.e., the value of Y when X = 0). This simple linear regression calculator uses the least squares method to find the line of best fit for a set of paired data, allowing you to estimate the value of a dependent variable ( Y) from a given independent variable ( X).
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