A medical researcher suspects that giving post-surgical patients large doses of Vitamin E will speed their recovery times by helping their incisions heal more quickly.

Design an experiment to test this conjecture. It must be randomized, comparative, double blind and placebo controlled.

Be sure to identify the factors, levels, treatments, response variable and role of randomization.

Thank you.

Which of the following represents empirical evidence? Group of answer choices

a. A second-hand account of a researcher’s observations

b. A research study without controls identified

c. An experiment that outlines the methods used

d. A review of studies that have been conducted on vaccine safety

e. Research that cannot be repeated because the methodology isn’t clear

Two fair coins and a fair die are tossed. Find the sample space of the
experiment (10 pts); Find the probabilities of the following events:
A- ”the die shows 2 or 3” (5 pts);
B- ”one of the coins is head, the other - tail, and the die shows an odd number” (5
pts).
Are the events A and B independent? (5 pts).
Give proofs.

Mothballs are composed primarily of the hydrocarbon naphthalene (C10H8). When 1.025 g of naphthalene is burned in a bomb calorimeter, the temperature rises from 24.25 ?C to 32.33 ?C.

Find ?Erxn for the combustion of naphthalene. The heat capacity of the calorimeter, determined in a separate experiment, is 5.11kJ/?C.

Express the change in energy in kilojoules per mole to three significant figures.

3) An experiment was performed where HEK 293 cells expressing TLR5 was treated with flagellin and the following absorbance readings were measured at 655 nm.

No treatment: 0.232, 0.247, 0.239

Flagellin treatment: 0.355, 0.377, 0.350

What is the P-value as calculated by T-test? Assume 2-tails and equal variance among the groups.

The following are the ratings of males by females in an experiment involving speed dating. Use the given data to construct a boxplot and identify the​ 5-number summary. 1.0 1.5 2.5 2.5 2.5 2.5 3.0 3.0 3.0 3.0 3.0 3.5 4.5 5.5 5.5 5.5 6.5 6.5 7.0 7.0 The​ 5-number summary is ?

1. A probability experiment is conducted. Which of the following cannot be considered a probability of an outcome? 1) 0.23 2) 1.00 3) - 0.34 4) 0.05

b- In a scientific study there are eight guinea pigs, five of which are pregnant. If three are selected at random without replacement, find the probability that all three are pregnant. P(all three are pregnant) =

The elimination experiment performed this week proceeds via E2 mechanism according to the textbook. As you have learned in lecture, there is stereoselctivity as well as regioselctivity associated with the E2 mechanism. What do you expect the products of reaction to be? Which is the major product and which is the minor product? Explain your answer from both setereoselctivity and regioselectivity aspects.

Suppose a university teacher wants to know whether or not requiring attendance improves student learning. How could she find out? Describe an experiment that an instructor might actually use. Review the experiments posted by your classmates. Evaluate the pros and cons of their proposals, and when applicable, suggest improvements or ask follow-up questions. (175 words)