BIOL 1208 Chapter : Bio Lab 4

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azuremammoth471

15 Mar 2019

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Biology Lab notes 9/30/13

Formulating Hypothesis

• Null Hypothesis → NO difference or no change between the treatment and

control in your experiment

• Alternative Hypothesis → WILL be a difference/change between the

treatment and control

• Don’t forget to draw the slope aka dotted line to make the square

Be specific…

• Before experiment: what was your null and alternative hypothesis?

• After experiment/Data analysis: Which hypothesis you rejected? Null or

Alternative

Null→ there will be no difference in the rate of reaction between the control and

treatment groups (need to specify which is the control and which is the treatment)

Alternative→ there will be a difference in the rate of reaction between the control

and treatment groups (need to specify which is the control and which is the

treatment)

Importance of Replica… basically find the mean

• To avoid experimental error

• For example: If I need to find effect of temperature on the rate of reaction

o Temperature 4 degree Celsius

How to get 3 Replica

• Ask the data from other partner/group from the same kind of experiment

In-Class writing:

Base for formal writing 1

Steps

-Calculate concentration for each treatment

-Calculate average concentration for each treatment

-Calculate standard deviation (S.D.) for each treatment

-Plot scatter smooth curve

-On these points, need to plot AD/error bar

-Plot all of your treatment in one figure

Standard Deviation

• Deviation from the mean (average) value

• Low SD = data points tend to be closed to mean value

• High SD= Data points spread out over large value

Formulas:

Concentration= (Cell no. with respect to value-0.0014)/1.0905

Time is independent (x axis)

Concentration is dependent (y axis)

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Document Summary

Null there will be no difference in the rate of reaction between the control and treatment groups (need to specify which is the control and which is the treatment) Alternative there will be a difference in the rate of reaction between the control and treatment groups (need to specify which is the control and which is the treatment) Importance of replica basically find the mean: to avoid experimental error, for example: if i need to find effect of temperature on the rate of reaction, temperature 4 degree celsius. How to get 3 replica: ask the data from other partner/group from the same kind of experiment. On these points, need to plot ad/error bar. Plot all of your treatment in one figure. Standard deviation: deviation from the mean (average) value, low sd = data points tend to be closed to mean value, high sd= data points spread out over large value.

Related Questions

The scientific method

You are living in your very first apartment. After a month younotice that there is a large buildup of black mildew around thetub. Late at night you see an infomercial about a new cleaningproduct "Zap Gone" that claims to be able to fix this problem. youdecide to spend the $19.95 and order the product. when the productarrives you decide to test it by spraying half of the tub with the"Zap gone" cleaning product and the other half you spray withwater.

a. what is the initial observation?

b. state the question

c. state your null and alternative hypothesis

d. identify the control group

After 3 days of treatment there is no visible change on eitherside of the tub.

e. what should your conclusion be for this experiment?

f. what would be the next step in the scientific method?

lilaccockroach920

4 According to a commercial, drinking water that has been blessed by Bill Nye the Science Guy improves your test scores. You think this is complete nonsense and want to disprove it. So you set up an experiment.

4a Would this be an observational or an empirical study?

4b To test it, for a total of 10 weeks, you take one test every week. Alternating weeks, you will drink regular water (control) and blessed water (treatment). How many replicas will you have?

4c What would be your null-hypothesis?

4d What would be your alternative hypothesis?

4e Name 3 possible confounding factors.

4f What is your independent variable?

4g Wat is your dependent variable?

4hs You set your a-level as always at 0.05, and do a statistical analysis to see if there is a difference in test scores between the two groups. The statistical analysis result is p=0.06 Is there a significant difference in test scores? Yes / No / Donât know

4i Based on the statistical analysis outcomes, does drinking blessed water improve test results? Yes / No / Donât know

4j 10 points A placebo effect is an improvement in a personâs perceived health from taking a non-active ingredient, presumably because of the belief that they are receiving a treatment helps that person to feel better. Your mind is a powerful thing and certainly can influence your health in real ways, so a placebo effect would include real improvements that come from âmind over matterâ as well as simple changes in perception. How can you avoid the placebo effect in this study?

ivoryraven299

A group of 11 mice was given water, and another group of 10 micewas supplied with diluted black coffee (coffee:water 1:1) asdrinking fluids for five weeks. The composition of the diets andliving conditions were similar for both groups of mice. Bloodglucose was monitored weekly for all mice. After five weeks, therewas no change in average body weight between groups. Resultsindicated that blood glucose concentrations increased significantlyin the mice that drank water compared with those that were suppliedwith coffee. Finally, blood glucose concentration in the coffeegroup exhibited a 30 percent decrease compared with that in thewater group.

1. What was hypothesis of this experiment? What question(s) was(were) the investigator asking?

2. Which is the control group? Why?

3. Which is the treatment group? Why?

4. Did the researchers follow the scientific method in theirexperimental design? Explain.

5. Do you think that there may be any possible biases or otherproblems in this experiment? Explain.

6. Based on the data, was the hypothesis supported, and what canyou conclude from this experiment?

peachfish658

BIOL 1208 Chapter : Bio Lab 4

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