Question: A researcher has used a complex design to study the effects of caffeine (caffeinated and decaffei...

A researcher has used a complex design to study the effects of caffeine (caffeinated and decaffeinated) and problem difficulty (easy and hard) on subjects’ memories. The researcher tested a total of eighty subjects, with twenty subjects randomly assigned to each of the four groups resulting from the factorial combination of the two independent variables. The data presented in the table represent the percentage words that subjects recalled correctly in each of the four conditions.

1. Is there evidence of a possible interaction in this experiment?

2.What aspects of the results of this experiment would lead you to be hesitant to interpret an interaction, if one were present in this experiment?

3.How could the researcher modify the experiment so as to be able to interpret an interaction if it should occur?

Question: A researcher has used a complex design to study the effects of caffeine (caffeinated and decaffei...

A researcher has used a complex design to study the effects of caffeine (caffeinated and decaffeinated) and problem difficulty (easy and hard) on subjects’ memories. The researcher tested a total of eighty subjects, with twenty subjects randomly assigned to each of the four groups resulting from the factorial combination of the two independent variables. The data presented in the table represent the percentage words that subjects recalled correctly in each of the four conditions.

1. Is there evidence of a possible interaction in this experiment?

2.What aspects of the results of this experiment would lead you to be hesitant to interpret an interaction, if one were present in this experiment?

3.How could the researcher modify the experiment so as to be able to interpret an interaction if it should occur?

Experiment 3: DNA Extraction 1. What is the texture and consistency of the DNA? 2. Why did we use a salt in the extraction solution? 3. Is the DNA soluble in the aqueous solution or alcohol? 4. What else might be in the ethanol/aqueous interface? How could you eliminate this? 5. Which DNA bases pair with each other? How many hydrogen bonds are shared by each pair? 6. How is information to make proteins passed on through generations? 7. Watch the Virtual Lab demonstrating DNA Extraction (located in the Student Portal and/or your lab introduction). In this experiment, how do the Lysis Solution and the Salt Solution vary by function? 8. Identify one step which was included in the Virtual Lab which was not required in the hands-on experiment. Then, identify one step which was included in the hands-on experiment, but not the virtual lab. Why weren’t these steps required?

Dr. M is doing a secret study to see how much anxiety affects performance in a statistics class. He treats two sections of statistics students exactly the same except that one section is taught progressive relaxation skills. It is Dr. M’s hypothesis that these skills will reduce anxiety and thus improve academic performance as measured by the students’ final grades in the course.

What is Dr. M’s independent variable?

What is Dr. M’s null hypothesis?

What is Dr. M’s experimental design?

What type of hypothesis is Dr. M using?

What is an example of a demand characteristic that could pop up in Dr. M’s experiment?

What is an example of a possible experimenter bias that could pop up in Dr. M’s experiment?

How many factors are there in Dr. M’s experiment?

How many levels are there in Dr. M’s experiment?

EXPERIMENT #6 DETERMINATION OF THE CONCENTRATION OF TARTARIC ACID IN WINE

1. Why must the sodium hydroxide concentration be reported to four significant figures? Why not use only two significant figures?

2. In the procedure, you added approximately 15 mL of water to each Erlenmeyer flask. Why did the exact volume of water not matter? What impact would accidentally adding 17 mL of water have on the results? Be prepared to explain.

3. Explain the significance of the value for relative standard deviation in the context of this experiment.

4. Explain the significance of the value for percent error in the context of this experiment.

5. The stoichiometric ratio in this experiment is 1:2. Determine how the calculation set-ups would change for the reaction between:

HNO3 (aq) + NaOH (aq) = H2O (l) + NaNO3 (aq) OR

H3C5H5O6 (aq) + 3 NaOH (aq) = 3 H2O (l) + Na3C5H5O6 (aq)

Facebook has long conducted digital experiments on various aspects of its website. For example, just before the 2012 election, the company conducted an experiment on the News Feeds of nearly 2 million users so that they would see more “hard news” shared by their friends. In the experiment, news articles that Facebook users' friends had posted appeared higher in their Newsfeeds. Facebook claimed that the news stories being shared were general in nature and not political. The stories originated from a list of 100 top media outlets from the New York Times to Fox News. Industry analysts claim that the change may have boosted voter turnout by as much as 3 percent. Read Chater 3, Closing Case found on page 83.  

Questions

1. Discuss the ethicality and legality of Facebook's experiment with human emotions.
2. Was Facebook's response to criticism concerning that experiment adequate? Why or why not?
3. Consider the experiments that Facebook conducted in May and June 2015. Is there a difference between these two experiments and Facebook's experiment with human emotions? Why or why not?
4. Should the law require companies to inform their users every time they conduct experiments? Why or why not?

Learner Outcomes
BI280-04 Compare and contrast the growth and reproduction of microorganisms.
BI280-04.02 Compare the phases of microbial growth and describe the relation to generation time.
Lab Extension
At 82% progress is this lab simulation you are asked to create your own experiment.

What observation or questions are you investigating with this experiment?

Write down your hypothesis.

Describe the experimental design .

Define the term control group. Which tube is the control?

Define the term experimental/treatment group. Which tube is the experimental/treatment group?

Define independent variable. In this experiment what is the independent variable?

Define dependent variable. In this experiment what is the dependent variable?

. Describe the data collected from the experiment. Include the temperatures you tested and how the growth curves differed. Describe differences (if any) in the lag phase, exponential phase, stationary phase, and death phase. At this point do NOTinterpret the results.

Was your hypothesis supported or rejected?

Interpret the results to draw a conclusion. Think about WHY you had the results you did and HOWthis relates to temperature as a limiting factor in bacterial growth.

On January 1, 2016, the following information was drawn from the accounting records of Carter Company: cash of $350; land of $2,250; notes payable of $650; and common stock of $1,300.

Income statement dated December 31, 2016.

Revenue $620

Expenses -$360

Net Income $260

a. Prepare a statement of changes in stockholders’ equity dated December 31, 2016.

b. Prepare a balance sheet dated December 31, 2016.

c. Prepare a statement of cash flows dated December 31, 2016. (Amounts to be deducted should be indicated with a minus sign.)

d. What is the balance in the Revenue account on January 1, 2016?

V=[(a b), a,b E R+] with (a1 b1)+(a2 b2)=(a1a2 b1b2)and for c E R, c(a b)=(a^c b^c) is a vector space over R. Define T:R^2 to V by T[a b]= (e^a e^b). prove T is a linear transformation from R2 to V.