Monday assignment

1. Did the true value for density fall within the confidence interval? What is the significance of the confidence interval with respect your experimentally measured density and the true value of density?

2. Does the interval increase or decrease and as the confidence level changes from 90 to 95 to 99% and is the change intuitive? Could you explain the change to your students conceptually?

3. The procedure for measuring density for the liquid used a graphical approach as opposed to our three trials and average method for determining the density of the solid. If you made a determinant (human) error for your first measurement in the liquid density portion, would this error plague or affect the subsequent measurements? (try to think of a situation where it would not and a situation where it would).

From jerseyinsd (Sam)
1. Yes, the value falls between the confidence value. The value shows the likelihood that the true density is somewhere between the two values, as calculated by the confidence formula.

2. The interval increases as the value increases which, in my opinion, is counterintuitive. I would have to use an example of something visual to explain that, as the percentage increases it is MORE likely that it is within an area, range, etc.

3. Human error could affect subsequent measurements, depending on what was being measured. If you mis-read the scale, the error would NOT affect subsequent measurements of mass, but if you misread the volume, you might continuously be off in subsequent volumes.