Let U and V be independent continuous random variables uniformly distributed from 0 to 1. Let X = max(U, V). What is Cov(X, U)?

Read the article, “Dye-sensitized solar cells using Aloe Vera and Cladode of cactus extracts as natural sensitizers.¨

Write 3 page essay following these conditions:

1. Discuss the problem statement(s) or the goal of the article. Cite the exact problem statement(s) from the article then provide interpretation of what they expect to gather from the experimentation. Use APA format or style when citing the problem statement. 2. Discuss the experimental design or the procedures followed in the experiment. Discuss/explain the pros and cons (advantages and disadvantages) of the procedures. 3. What are the major findings or outcomes of the experiment? What did you learn from this article? Were the conclusion(s) drawn correct and supported by data/observations from the experiment? Elaborate your response. 4. What applications in real-life do you foresee to use/apply (dye-sensitized) solar cells? Mention at least two real-life applications then elaborate your answer. What else could you do to improve the design and materials for the experiment? If there is no provided suggestion for improvement, give reasons why you think the design and the materials used in the experiment are ideal.

Please help me out with this so I can have a better understanding, thank you so much!!!

An experimenter is investigating the effects of noise on the performance of a tracking task. The task is to use a mouse to keep a cursor on a computer screen on a randomly moving target dot. The dependent variable is the amount of time a person can keep the cursor on the dot. It was hypothesized that subjects performing the task when no environmental noise is present will keep the cursor on the target for a greater amount of time than subjects who perform the task while listening to loud noise.

Each action by the experimenter that is described next confounds this experiment by letting an extraneous variable vary systematically with the independent variable of noise condition. For each action, identify the extraneous variable confounding the experiment and explain why the experiment is confounded.                                                                                   

An experimenter is investigating the effects of noise on the performance of a tracking task. The task is to use a mouse to keep a cursor on a computer screen on a randomly moving target dot. The dependent variable is the amount of time a person can keep the cursor on the dot. It was hypothesized that subjects performing the task when no environmental noise is present will keep the cursor on the target for a greater amount of time than subjects who perform the task while listening to loud noise.

Each action by the experimenter that is described next confounds this experiment by letting an extraneous variable vary systematically with the independent variable of noise condition. For each action, identify the extraneous variable confounding the experiment and explain why the experiment is confounded.                                                                                            

Please provide the correct term described in each question below.

1. The probability that a test correctly classifies as negative those individuals who do not have preclinical disease.

2. Individuals who test negative for a disease even though they actually have the disease.

3. A measure of the new cases of disease in a prospective cohort study.

4. The type of study design that examines the associations between diseases and other variables of interest in a defined population at one particular time.

5. This is present when the association between exposure and disease is different within categories or levels of a third variable.

6. The prevalence of disease at a certain point in time.

7. Hill criterion where consistent results are found in different populations, in different time periods, with different study designs.

8. Lack of random error in estimating a population parameter.

9. The appropriate measure for determining whether a screening test correctly classifies people with disease as having disease.

The study design where increasing sample size decreases the possibility of confounding

1) A group of researchers would like to study the effect of electronic cigarettes (e-cigarettes) use on getting lung cancer. 500 subjects were randomly sampled from e-cigarettes users and 500 subjects were randomly sampled from non-users for monitoring. The incidence of lung cancer for the two groups are reported in the following contingency table.

Based on this sample, what is an estimated population risk ratio of getting lung cancer between e-cigarette users and non-users (correct to 2 decimal places)?

A) 2.84

B) 0.35

C) Cannot be determined.

D) 2.40

2) A basket consists of 3 red balls and 2 white balls which are identical in all other respects. 3 balls are chosen at random with replacement. Let A be the event of obtaining at least 1 white ball. Let W represent the number of white balls obtained. For example, P(W=1) is the chance of obtaining exactly one white ball. Which of the following is equal to P(A)?
(I)   P(W=1) x P(W=2) x P(W=3)
(II)   1 – P(W=0)

A) Neither (I) nor (II).

B) Only (II).

C) Both (I) and (II).

D) Only (I).

3) A researcher wants to investigate if excessive gaming in adolescents increases the risk of a child having Attention-Deficit/Hyperactivity Disorder (ADHD). A person who spends at least 6 hours on gaming per week is classified as a gamer; otherwise a non-gamer. For simplicity, assume that ADHD can be diagnosed quite accurately. If the researcher wants to do a cohort study, which of the following statements indicate how he should carry out his study?

A) He should randomly sample from “Gamer” and “Non-gamer” populations and compare r(ADHD | Gamer) with r(ADHD | Non-gamer)

B) He should randomly sample from “ADHD” and “no ADHD” populations and compare r(Gamer | ADHD) and r(Gamer | no ADHD).

C) He should randomly sample from “Gamer” and “Non-gamer” populations and compare r(Gamer | ADHD) with r(Non-gamer | ADHD).

D) He should randomly sample from “ADHD” and “no ADHD” populations and compare r(ADHD | Gamer) and r(no ADHD | Gamer).

4) Let E and F be two events in a sample space. Which of the following statements is/are definitely true?   
I) If P(E) + P(F) > 1 then E and F are not mutually exclusive.
II) If E and F are mutually exclusive, then P(E) = P(F) = 0.5

A) Only (II).

B) Neither (I) nor (II).

C) Both (I) and (II).

D) Only (I).

5) Which of the following statements is/are true?
I) Cohort studies have no control group whereas case control studies do.
II) Case control studies are better than cohort studies for rare events/diseases.
A) Only I is true

B) Only II is true.

C) Both I and II are true

D) Neither I nor II are true.

*PLEASE TYPE YOUR ANSWER (NO SCREENSHOTS OR IMAGES). THANK YOU IN ADVANCE

Reduction Half Reaction E (V)

Ag₂MoO₄(s) + 2e^- ---> 2 Ag(s) + MoO₄^2-(aq) 0.4573 V

Ag⁺(aq) + e^- ---> Ag(s) 0.7996 V

a.) Calculate the mass in grams of Ag₂MoO₄(s) that will dissolve in 2.0 L of water.

b.) Calcilate the cell potential of:

Ag(s) | Ag₂MoO₄(s) | MoO₄^2-(aq) (0.010 M) || Ag⁺(aq) (0.010M) | Ag (s)

V-51 (atomic mass = 50.94396 amu)

Mass defect? Amu

Binding energy per nucleon? express answer using four sig figs. Me/V nucleon

Ag-107 (atomic mass = 106.905092 amu)

Express your answer using five decimal places.

Mass defect? amu

Binding energy per nucleon? Me/V nucleon

four sig figs.

Which of the following(s) affects the composition of the optimal risky portfolio?

I. Expected returns of assets

II. Standard deviations of assets

III. Risk-aversion

IV. Correlation among assets

V. Risk-free rate