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Probability
The probability of a certain event is a number expressing the likelihood that a specific event will occur, expressed as the ratio of the number of actual occurrences to the number of possible occurrences. In mathematics, it is a measure of how often an event will happen and is the basis of statistics.
14,643 Questions
The probability of drawing three black cards one at a time with replacement from a standard deck of 52 cards is 1/3x1/2x26/52, which is 0.833.
What is the probability of getting five questions correct on a 20 question multiple choice test?
The answer depends on the number of choices available for each question.
3 in 10
4
What strategy is used for multiple choice questions?
This one is for free: stay tuned at the end though.
- Go with your gut. If that fails, narrow it down by elimination. Failing that, continue below.
- It is easier to write a false statement than a true one for a test, so about 60% of true/false test questions will be false.
- About 70% of all multiple choice answers will be a middle choice. So, for five choices, 3 or C will be the answer. For four choices, 2 or B, or 3 or C will be the answer, and the third choice is most common.
- In the event one option is "all of the above" about 75% of the time this is the answer. "None of the above is 50% or less.
These strategies only work if the test designer is not aware of the human behavior normal in test design. Being one of those people, my assessments were one third true/false divided 50/50; one third multiple choice of only four options and those were divided into 25% for A, B, C, & D; and one third essay.
Take notes and study.
What is the probability of getting green if there is 3 blue 2red and 4 green?
If there is 3 blue 2 red and 4 green. What is the probability of getting green?
How does a sampling error affect the interpretation of your data?
The greater the sampling error the greater the uncertainty about the results and therefore the more careful you need to be in the interpretation.
There are 230300 ways.
What are the odds of drawing a diamond from a ordinary deck of cards?
The probability, if you draw 40 cards, without replacement, is 1. That is, it is a certainty.
The probability on a single random draw is 1/4.
What is the probability of obtaining tails six times in a row when flipping?
You have a 1 in 2 chance with one flip; so, 2 to the 6th power, or 1 in 2x2x2x2x2x2; a 1 in 64 chance.
How many different ways can you arranged the word china?
25 and over
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The number of ways is 5x4x3x2x1= 120 ways
How are experimental probability and theorectical probability alike?
Both are measures of the likelihood of events.
What is the probability of the spinner landing on a vowel and then a consonant?
What is the probability of the spinner landing on CorB
Use of probability in logarithmic relations?
None.
If you have an exact relationship - whether it is linear, polynomial, logarithmic or whatever - probability has no role to play.
What proportion of a normal distribution is located between z -0.50 and z 0.50?
Prob(-0.5 < z < 0.5) = 0.3830
How does the mean affect the graph of a normal distribution?
It determines the location of the graph: left or right - but not its shape.
Is the distribution of sample means always a normal distribution If not why?
It need not be if:
the number of samples is small;
the elements within each sample, and the samples themselves are not selected independently.
What is the relationship of the standard error of the mean to the standard error of the difference?
It would help to know the standard error of the difference between what elements.
How do you write an answer to a probability question?
Probability questions are not all the same so there is not a single kind of answer: it depends on the nature of the question!
What happens to the standard error of the mean if the sample size is decreased?
The standard error increases.
What is the important similarity between the uniform and normal probability distribution?
They are both continuous, symmetric distribution functions.
The mean must be 0 and the variance must be 1.
