Positive Control Lab Report

A control group should be used in an experimental study because you need an independent variable to base your test off of. This variable cannot influence the results. A common example of a control group is one that is held at ordinary conditions so there is no changing variable. For example, if you want to experiment on the effects of fertilizer in plant growth, a control group would be a plant or plants that are not given fertilizer. The experimental group would receive fertilizer. The control group then provides a baseline to see if the experiment had any effect.

The purpose of the control group is the keep the experiment consistent throughout for the best results. For instance, four white carnations are placed in four vases with plain tap water. Two of them have other liquids added to them, making the plain tap water flowers the control group. They stay consistent

The mole is a convenient unit for analyzing chemical reactions. Avogadro’s number is equal to the mole. The mass of a mole of any compound or element is the mass in grams that corresponds to the molecular formula, also known as the atomic mass. In this experiment, you will observe the reaction of iron nails with a solution of copper (II) chloride and determine the number of moles involved in the reaction. You will determine the number of moles of copper produced in the reaction of iron and copper (II) chloride, determine the number of moles of iron used up in the reaction of iron and copper (II) chloride, determine the ratio of moles of iron to moles of copper, and determine the number of atoms and formula units involved in

The control portion of a petri dish was used but we did not test to see if reacted with the hydrogen peroxide, so there was technically no control in this case.

A buffer is a solution that resists changes in pH when H+, OH-, or H20 is added. By using standard lab equipment, a lab pro diagnostic tool, and acidic and basic solutions, the pH can be found. By recording the pH while adding a base or an acid gradually to a buffer solution you can find the capacity of each buffer to resist drastic changes in pH. The best buffers will keep a solution from becoming either too acidic or basic with the addition of a strong base or acid.

The purpose of this lab was to identify unknown bacteria cultures using various differential tests, and my unknown bacteria is #17. The identification of these unknown cultures was accomplished by separating and differentiating possible bacteria based on specific biochemical characteristics. Whether the tests performed identified specific enzymatic reactions or metabolic pathways, each was used in a way to help recognize those specifics and identify the unknown cultures. The differential tests used to identify the unknown cultures were Gram stain, Catalase, Mannitol Salt Agar (MSA), Blood Agar, Novobiocin, Coagulase, and DNAse (Alachi, 2007).

To perform this test, a tube of broth rich with glucose is acquired. In this tube is phenol red, a pH indicator. Initially, the tube appeared pink in color, indicating a normal pH level. Next, a sample of unknown #44 is introduced into this medium using the aseptic technique, and this is allowed to sit for several days. If the organism is able to ferment glucose, the pH in the medium would decrease and cause the phenol red to exhibit a yellow color. In addition to the straw color, gas can also be produced and trapped inside the Durham tube placed in the medium. This production of acid and gas is a direct result of the fermentation of glucose, as seen with unknown

The controls are the ordinary groups that have not been treated. These are made so that the experimental groups can be compared to it.

1. It is important to include a control group whenever possible because it makes our data more accurate and strengthens its validity. The purpose of a control group is to observe any discrepancies that occurs between it and the other groups tested, thus helping display the effectiveness or usefulness of the treatment or whatever being tested. If an experiment does not have a control there is no benchmark for the results to be compared to or associated with, which will inevitably lead to the results containing some bias.

2C. A control group is usually not tested around the independent variable, so it's kept away. A controlled variable is a variable you yourself can control during an experiment.

2. (5 pts) List and explain the names and affiliations of the various characters/stakeholders in this story – I’m looking for us to use the story to map out the complexities that are generally associated with solving public health puzzles – the stakeholders you list and explain here should apply to many of the cases we consider going forward.

variable one is testing for. In this experiment the importance of the control was to compare the

A control condition is necessary to include when testing any hypothesis because you have to isolate the variable being tested in order to ensure that no other factors could alter the results. In this case, the hypothesis is that talking on a cell phone impairs peoples driving skills. A control condition or group is crucial because it allows for comparison to the experimental condition. The cell phone is the independent variable in this experiment, thus the skill of the driver is the dependent variable. Both groups should be picked at random so that there aren't an abundance of “bad drivers” in one of the groups. All other variables must be controlled as best as possible in order to maintain balanced, unbiased, and accurate data. Overall, the

Randomized control trial is defined as a type of experiment where the participating subjects are given randomly selected treatments. This type of experiment is used to determine if a cause-effect relationship exists for the treatment and the outcome.

Controls are measuring sticks to see if the desired goals are being met. Successful managers create parameters for their employees and implement controls within a criteria to confirm if the job is being done to standard. Case in point, I give quarterly performance counseling’s to each subordinate in my department on performance, being efficient at the job and using problem solving techniques. Controls to an extent border along the lines of micromanaging, but it can also be used to emphasize how well the subordinate is doing too. All quarterly counseling’s are not corrective in nature, but it is a great assessment tool for exceptional job performance as well. The usage of controls is part of my responsibility as a supervisor to ensure the goals are being achieved to standard.