Experiment: An urn contains 4 blue marbles and 8 orange marbles. Two marbles are drawn without replacement. What is the probability that a blue and orange marble are drawn? A) 0.4444 B) 0.2424 C) 0.1212 D) 0.4848 E) 0.2222

The answer is D I just don't understand how my professor got it.

In a Compton scattering experiment, a photon with a wavelength ?=1.50x10^-3 nm collide with a stationary electron. After the collision, the electron recoils at 0.500c a) What is the energy and wavelength of the scattered photon? b) through what angle with respect to the incident direction was the photon scattered? [Hint: Me=0.511 MeV/c² or Me=9.11x10-31 kg]

2. Using the Michelson-Morley experiment as an example, explain why classical mechanics was unable to explain natural phenomena.

3. Using at least one of Einstein's "thought-experiments", explain how special relativity addresses how it is possible for observers in two different inertial reference frames to “disagree” about time and distance intervals.

When setting up a PCR experiment, you must prepare a positive control sample. What would the positive control help you discover?

A) You forgot to add Loading Dye to your samples

B) The DNA ladder is denatured

C) Your thermocycler is broken

D) Your reagents are contaminated with foreign DNA

A genetic experiment with peas resulted in one sample of offspring that consisted of 438 green peas and 162 yellow peas. a. Construct a 95​% confidence interval to estimate of the percentage of yellow peas. b. It was expected that​ 25% of the offspring peas would be yellow. Given that the percentage of offspring yellow peas is not​ 25%, do the results contradict​ expectations?

Jenae changed the original coffee labels with plain white ones that had the flavor printed in bold black letters, and she placed them on the coffee pots for the week-long experiment.

Jenae used an aspect of experimental design known as ________ when she created the labels to have the same appearance.

• randomization

• a control

• replication

• a treatment

1. How would it affect organisms living in cold climates if oil or alcohol were their main body fluid?
2. How do you think the cohesive nature of water relates to its evaporation?
3. Describe in detail an experiment you could conduct to test whether another substance could replace water.

The average sperm count in males is now lower than it was several decades ago. The reasons for lower sperm counts observed in males today is not known. Propose a hypothesis as to why, global, sperm counts are lower today than then were fifty years ago. What experiment could you do to test your hypothesis?

Consider the following reaction at 283 K:

2A + B → C + D

where rate = k[A][B]². An experiment was performed where [A]_o = 2.67 M and [B]_o = 0.00241 M. A plot of 1/[B] vs. time has a slope of 10.01. What will the rate of this reaction be when [A] = [B] = 0.345 M?

A genetic experiment with peas resulted in one sample of offspring that consisted of 417 green peas and 153 yellow peas.

a. Construct a 90% confidence interval to estimate of the percentage of yellow peas.

b. It was expected that​ 25% of the offspring peas would be yellow. Given that the percentage of offspring yellow peas is not​ 25%, do the results contradict​ expectations?