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# Tutor profile: Calli L.

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Calli L.
College Student with a passion for teaching
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## Questions

### Subject:Writing

TutorMe
Question:

How can you make one essay stand out when 50 other people are writing about the same topic?

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Calli L.

### Subject:Statistics

TutorMe
Question:

What is a p-value and what does it mean?

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Calli L.

The p-value is used in hypothesis testing to determine whether or not the null hypothesis is true. As a general rule, remember the rhyme, "if the P-value is high, the null must fly. If the P-value is low, the null must go." What does this mean? Here is a real life example: I have a deck of 52 cards. How do we determine if this is a regular deck? I'll show you. Say I draw a card at random and get the Jack of spades. The next card I draw is a seven of clubs. I draw another card - 4 of clubs. Seems pretty normal right? I draw two more cards - queen of spades and ace of clubs. Do you think it's strange that I haven't drawn a red card yet? What's the probability of drawing 5 black cards in a row? The probability of drawing 1 black card is 0.5, so (0.5)(0.5)(0.5)(0.5)(0.5) = 0.03125. What if I drew another black card? The probability of 6 black cards in a row is 0.01563. At what point did you become suspicious that my deck wasn't normal? This is why we use the p-value to determine if we should accept the null hypothesis. At first, we assumed that my deck was normal. However, as the probability for the results decreased we began to reject our original hypothesis and believed I did not have a normal deck.

### Subject:Accounting

TutorMe
Question:

What is the difference between a debit and a credit?

Inactive
Calli L.

Picture the accounting equation as a scale. The right side holds all of the asset accounts and liabilities and owner's equity accounts are on the other. Each account has its "normal balance" side to represent an increase or a decrease to that account. All asset accounts have a normal balance as a debit. For example, a debit to Cash means an increase in cash and a credit to cash means a decrease. In order to maintain a balanced scale, the opposite must be true for all liabilities and owner's equity accounts. For instance, a credit to Accounts Payable is an increase to that account and vice versa.

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