Chapter 6 begins with some alternative explanations for recent changes in the homicide rate. Which of the explanations make the most sense to you? Why? How could you learn more about the effect on crime of one of the "causes" you have identified in a laboratory experiment? What type of study could you conduct in the community to assess its causal impact?

Hypothesis testing is based on the idea that if there is enough of a difference between your experimental sample and the comparison distribution, you can see the research supports your hypothesis.

Describe an experiment in which you would expect there to be a very small difference between the experimental sample and the comparison distribution. How small of a difference could there be for you to still be okay with rejecting the null hypothesis?

Organic II lab: Fischer Esterification: Preparation of Benzocaine

The protocol for this week’s experiment calls for the adjustment of the pH with sodium carbonate prior extracting the aqueous mixture with diethyl ether.

(a) Why is it necessary to adjust the pH to 8?

(b) Why would it be unwise to use strong bases such as NaOH or KOH in the pH adjustment? Illustrate your thoughts by a chemical reaction

A 5.193 gram sample of an organic compound containing C, H and O is analyzed by combustion analysis and 9.255 grams of CO₂ and 3.790grams of H₂O are produced.

In a separate experiment, the molar mass is found to be 74.08 g/mol. Determine the empirical formula and the molecular formula of the organic compound.

Enter the elements in the order C, H, O

Trypsin is an enzyme that can digest the hydrophilic portions of membrane proteins, but it is unable to penetrate the lipid bilayer and enter a cell. Due to these properties, trypsin has been used in conjunction with SDS-PAGE to determine what proteins have an extracellular domain. Describe an experiment using trypsin to determine the sidedness of proteins of the erythrocyte membrane. BE SURE TO INCLUDE ANY RELEVANT CONTROLS

1: A) Starting with two slits, separated by a distance "d," derive the key relation(s) associated with locating interference patterns.

B) Explain the effect on interference patterns if the number of slits is increased (but "d" remains the same).

C) Outline an experiment you can perform to determine the wavelength of a laser pointer (max intensity of 5mWatt) using "basic" lab equipment.

In a Young's double-slit experiment the wavelength of light used is 462 nm (in vacuum), and the separation between the slits is 2.1 × 10^-6 m. Determine the angle that locates (a) the dark fringe for which m = 0, (b) the bright fringe for which m = 1, (c) the dark fringe for which m = 1, and (d) the bright fringe for which m = 2.

An ordinary (fair) die is a cube with the numbers through on the sides (represented by painted spots). Imagine that such a die is rolled twice in succession and that the face values of the two rolls are added together. This sum is recorded as the outcome of a single trial of a random experiment. Compute the probability of each of the following events.

Event A : The sum is greater than 5 .

Event B: The sum is an even number.

Senario: You are watching a group of children run relay races. You would like to determine the speed of that the children run. You select 30 children and time them in their relay races.

e) What is the parameter for the study?

f. What is the statistic for the study?

g. Is the study an experiment or an observational study?

h. For the study, should you use a proportion or an average?