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Alex
2 years ago
5

What is full form of MCB​

Advanced Placement (AP)
2 answers:
neonofarm [45]2 years ago
6 0

Answer:

MCB stands for miniature circuit breaker

Explanation:

hope this helps

uranmaximum [27]2 years ago
5 0

Answer:

MCB = Miniature Circuit Breaker

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Is this study an experiment or an observational study? Explain your answer.
seraphim [82]

Answer:

Explanation:

Hello!

Full text in the attachment.

a)

Little reminder:

An observational study is one where the investigator has no control or intervenes on it. He just defines the variable of interest and merely collects and documents the information. These types of studies are usually made as precursors to a more formal experimental study, to have an idea of what's to be expected from the population.

An experimental study or experiment is one where the investigator intervenes by defining the variable of interest and artificially manipulates the study factor. It is also one of its characteristics the randomization of cases or subjects in groups (two or more, depending on what is the hypothesis of study).

This is an example of a double-blind experiment, in which neither the experimental subjects (volunteers students) nor the researcher (physician). Aside from the fact that the subjects were controlled to make sure they followed the assigned treatment, no other factors were controlled (sleeping habits, eating habits, previous medical conditions)

Still, there is enough intervention to classify it as an experimental study.

b)

You have calculated the probability of randomly selecting a student that contracted the flu. There is no specification about the group the student belongs, you have to calculate the probability of the total of students that contracted the flu.

Let F represent the event that "the student contracted the flu", you can calculate the probability as:

P(F)= \frac{total students that contracted the flu}{total students that participated in the trial}= \frac{633}{808}= 0.78

c)

In this case, you have to calculate the probability that the student contracted the flu, given that he was assigned to the "Vitamin C" group.

This is a conditional probability since you already know that the student was from the "Vitamin C" group (Symbolized V), instead of calculating the probability using the size of the total of volunteers, you'll use the total of students assigned to that group:

P(F/V)= \frac{Students that contracted the flu and took Vitamin C}{Total of students that took Vitamin C}= \frac{302}{403} = 0.75

d)

Two events are independent when the occurrence of one of them doesn't modify the probability of occurrence of the other one. In this case, we have the events F: "The student contracted the Flu" and V: "The student took vitamin C" if F and V are independent the probability of F should stay the same even whether or not he has taken vitamin C:

P(F)=P(F/V)

But as calculated in items b. and c. these probabilities are different, meaning that the events are not independent.

e)

The claim of the health expert is that "Vitamin C reduces the occurrence of the flu in the population of volunteer students, i.e. the number of students that contracted the flu given that they took vitamin C will be less than the number of students that contracted the flu given that the took the placebo.

The parameters of the study will be the population proportions of students with the flu that took vitamin C, p₁, and the population proportion of students with the flu that took the placebo, p₂.

H₀: p₁ ≥ p₂

H₁: p₁ < p₂

f)

Let's assume that α: 0.05, using the p-value approach, the decision rule is:

p-value ≤ α, reject the null hypothesis.

p-value > α, do not reject the null hypothesis.

The p-value: 0.0096 is less than α: 0.05, the decision is to reject the null hypothesis. At a 5% significance level, there is significant evidence to reject the null hypothesis, then the population proportion of students that contracted the flu given that they took t vitamin C is less than the proportion of students that contracted the flu given that they took the placebo.  You can conclude that the expert is correct and taking vitamin C reduces the occurrence of the flu among the students.

6 0
3 years ago
Which two types of accounts offer tax benefits before saving?
VMariaS [17]

529 account and 401K account

6 0
3 years ago
What was at stake between the competing candidates, especially Adams and Jackson?
garik1379 [7]

The correct answer to this open question is the following.

Although there are no options attached we can say the following.

What was at stake between the competing candidates, especially Adams and Jackson was the reputation and legality of the United States election system.

We are talking about the controversial US election of 1824.

In this election, four candidates participated: Andrew Jackson, John Quincy Adams, Henry Clay, and William Crawford. The election resulted very competitively, without a clear winner. In the end, Andrew Jackson won the popular vote. That is why the final result relied on the hands of the House of Representatives. Congress gave the final victory to Jhon Quincy Adams, and candidate Jackson accused the decision to be corrupted.

President Adams appointed Henry Clay as his Secretary of State and that made Andrew Jackson accuse this of a corruption action. The popular mane of this situation was known as the Corrupt Bargain.

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2 years ago
Urgent!
PilotLPTM [1.2K]

Self-control could be defined as the conscious ability to regulate impulses voluntarily, if we don't feel self-control relational processes becomes disrupted.

Self-control is the ability to regulate emotions, thoughts and behaviors effectively in different situations.

  • A person with self-control can manage their emotions and regulate her behavior, copes with setbacks with serenity, has patience and understanding in relational processes.

  • Lack of self-control affects the ability to establish and maintain positive and rewarding relationships with diverse individuals and groups through communication, social commitment, and teamwork.

Therefore, we can conclude that self-control allows to regulate emotions, thoughts and behaviors, giving the possibility of choosing actions and reactions to stimuli, with the aim of achieving a greater personal and relational balance.

Learn more about self-control here: brainly.com/question/12787425

7 0
2 years ago
How long should I study for the APUSH exam?
Dovator [93]

Answer:

How many hours you need to spend on studying for AP tests every week is going to depend a lot on how much material you need to review and how comfortable you are with the format of the exam questions. In general, though, you should expect to study for several hours a week split over two to three sessions.

Explanation:

4 0
3 years ago
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