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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.
36,756 Questions
What is best Interquartile range or Median absolute deviation?
The answer depends on the purpose. The interquartile range and the median absolute deviation are both measures of spread. The IQR is quick and easy to find whereas the MAD is not.
What 9 numbers have a a median of 5 but not a mean of 5?
Here is an example.
1,1,2,3,5,6,6,7,10
The median is the middle-most observation and equal to 5.
The mean is the average = 41/9 = 4.56
What are the uses of statistics in the educational sector?
1) Measuring student and/or teacher performance.
2) Comparing results of different schools, curricula or ethnic (SES) groups.
3) Measuring rates of student drop-out, violence, success after high school (comparing high school grades to subsequent grades in university).
What is the smallest number that can be formed using the digits 2 and 7?
Using a decimal point, it would be .27 (normally written as 0.27).
This is somewhat smaller than 2/7 (which is about 0.286).
* * * * *
Why not -27 which is -128?
What are the odds of getting a sum divisible by four by rolling 2 dice?
When rolling 2 dice there are 36 combinations that can occur.
Sums will range from 2 to 12; sums divided by 4 are 4, 8, and 12
You can get this by dice combinations of
1 3
3 1
2 2
4 4
2 6
6 2
3 5
5 3
6 6
That is 9 ways. so odds are 9/36 = 1 in 4
How many ways 3 students can sit in 3 chairs?
The first student has 3 chairs to choose from. Once he has mad the choice, the second student has 2 chairs to choose from. And the last student only has 1 choice, so 3 x 2 x 1 = 6 ways.
Here are the six ways. For ease, call the students A, B, and C:
- ABC
- ACB
- BAC
- BCA
- CAB
- CBA
In ordered pair the second number is always the value of y?
Yes and no.
In two-dimensional Cartesian coordinates, the answer is usually yes. So the point (4,7) has x value 4 and y value 7.
But there are other uses for ordered pairs. For example in polar coordinates a point is specified by an ordered pair (r, theta), and the second number is an angle. You need to know what context you are working in.
It means any substance that readily absorbs moisture, like from the atmosphere.
i.e wool goes by this term therefore has thermal qualities when laid as a carpet, in winter it absorbs the moist cold air leaving the atmospere in the room warmer and in summer it actually absorbs up to 30% of the humidity thus leaving it cooler.
to be pessemistic is to have a negative expectation of future outcomes To be pessimistic basically means that you'll always expect a bad (or the worst) outcome out of every situation....You don't hope for much because you find that something can always go wrong...^^
What is the median of 9-6-5-0-6-11-10?
If a set of numbers is arranged in ascending or descending order the median is the value which lies halfway along the series.
9-6-5-0-6-11-10 when placed in ascending order becomes 0-5-6-6-9-10-11.
The median is therefore 6.
Note : When there are an even number of values the median is the mean of the middle two values.
What is the relation between mean median?
mean = all the numbers added together, divided by the number of numbers
median = the middle number - get the numbers in chronological ( smallest 2 biggest) order, then
if its odd number of numbers, its the middle one
if its even number of numbers, then its the middle two, added together divided by two
Project of mathematics in daily life?
When you buy a car, follow a recipe, or decorate your home, you're using math principles. People have been using these same principles for thousands of years, across countries and continents. Whether you're sailing a boat off the coast of Japan or building a house in Peru, you're using math to get things done.
How can math be so universal? First, human beings didn't invent math concepts; we discovered them. Also, the language of math is numbers, not English or German or Russian. If we are well versed in this language of numbers, it can help us make important decisions and perform everyday tasks. Math can help us to shop wisely, buy the right insurance, remodel a home within a budget, understand population growth, or even bet on the horse with the best chance of winning the race.
What is the different between evo x and evo 10?
they are the same cars!! its just the x stands for the roman numeral 10.
A band-limited signal is one in which the Fourier transform is zero above a certain frequency. In other words it's a signal that ahas a finite frequency content. The simplest case is a pure sinusoidal signal, whose Fourier transform consists of a delta function centred on the frequency of the signal. A band-limited signal can be reconstructed exactly if it is sampled at at more than twice the maximum frequency present in the signal.
A time-limited signal is a signal that is zero above a finite. An example of this would be a short pulse.
The reason a signal cannot be both band-limited or time-limited is due to their relationship via the Fourier transform. One can show it is impossible for the Fourier transform of a signal with compact support ie either time or band-limited, to also have compact support. A time-limited signal must have a continuous frequency spectrum existing over all possible frequencies and a band-limited signal can only arise from signal existing for all time. Note this indicates in reality it is impossible to have a truly band-limited signal as it would take infinite time to transmit, but it is nonetheless a useful concept and we can produce nearly band-limited signal to a high degree of accuracy.
