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Statistics

Statistics deals with collecting, organizing, and interpreting numerical data. An important aspect of statistics is the analysis of population characteristics inferred from sampling.

36,755 Questions

What is the relevance of probability and statistics in the field of information technology?

In the field of IT you are dealing with probabilities all day long. How long will the hardware last, how can you keep the signal for the network strong all over the building, how will adding a new group of computers impact the network, or heaven forbid your network come under attack and you need to keep damage to a minimum while fending off the attack. IT professionals think in probabilities. They're always running scenarios through their heads to come up with and fix problems before they occur.

What is the probability of when you roll a dice you will get a higher number than the number you got the last you rolled the dice?

5/12

Consider the possibile outcome of two rolls of a die (where order matters):

(1,1)

(1,2)

(1,3)

.

.

.

(4,6)

(5,6)

(6,6)

There are 6*6=36 possible outcomes. Of these, the following would achieve the result desired:

(1,2)

(1,3)

(1,4)

(1,5)

(1,6)

(2,3)

(2,4)

(2,5)

(2,6)

.

.

.

(5,6)

For the first die equal to 1, there are 5 successful results. For the first die equal to 2, there are 4 successful results....For the first die equal to 5, there is 1 successful result. The total number of successful outcomes=5+4+3+2+1.

So the probability that the desired outcome is obtained=(5+4+3+2+1)/36=15/36=5/12.

What do you do if your doing mean medain and mode and you have four numbers as your mode what do you do?

It is acceptable (and quite common) to have multiple values for the mode.

Examine the following data sample:

Number of pets per family on Main Street

1,1,1,1,1,2,2,2,2,2,3,3,3,4,4,5,9

In this case, the mode is {1, 2}

What percentage of people today know who Edgar Allen poe is?

It is close to 0%.

Edgar Allan Poe, the writer, died over 150 t=years ago, so any Edgar Allan Poe who is still alive is a namesake but effectively a nonentity. Therefore, the percentage of people who know who he IS is 0%.

Why would someone want to assume that your sample data represents a population distrubution?

Most people take samples so that they may make estimates of parameters of interest: mean, variance, etc for the whole population. For such an estimate to have any validity the sample data must be assumed to represent a population distribution. Otherwise any conclusions based on the sample are valid only for the sample: hardly worth the effort!

How do find median of a set of numbers?

you like cross 1 number out on each side until you have one nuber left i think in some cases but im not like 100 percent sure about the two number thing i just know that you cross it out out until you get to the middle

What is the advantage of keeping the prism in minimum deviation?

By keeping the prism in minimum deviation position, the RI of the prism can be calculated efficiently.

What is the probabilitly of rolling a 4 on a 10-sided dice?

The probability is (0.1) times (the number of faces with '4' marked on them).

What is meant by absolute measure?

It is the value without considering the symbols. ie, the negative or positive symbols of the value