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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
How do you calculate r-squared for regression for beta?
Multiply r by r? I'm not sure if I understand your question, but that's how you calculate r^2.
What values of froude number mean?
It is a dimensionless number that relates inertial to gravitational forces in the upstream flow. It is useful when looking at hydraulic jump (fluid dynamics)
What do the 3 different sets of numbers on plant food cans mean example 15-4-12?
They are an expiry date. It sounds like that date is written in the British format: day-month-year.
Which type of graph gives you the greatest value of the data set?
A box and whiskers plot,
A frequency plot (ungrouped)
A cumulative frequency plot (ungrouped),
A grouped frequency of cu freq plot should give a number close to (and larger than) the greatest value.
How do you get 8 with the numbers 1 2 3 and 4?
Subtract 2 from 3 to get 1, add that to the 1 we already had to get 2, and multiply that by 4. In short form: 4*(1+(3-2)) = 8.
Why use the squarred version of the sum of deviations from the mean?
You cannot use deviations from the mean because (by definition) their sum is zero.
Absolute deviations are one way of getting around that problem and they are used. Their main drawback is that they treat deviations linearly. That is to say, one large deviation is only twice as important as two deviations that are half as big. That model may be appropriate in some cases.
But in many cases, big deviations are much more serious than that a squared (not squarred) version is more appropriate.
Conveniently the squared version is also a feature of many parametric statistical distributions and so the distribution of the "sum of squares" is well studied and understood.
What variables determine the color of candy?
the dye or food coloring that is added to it.most flavorings are colorless
What is a number that has two or more multiples called?
It's called a number. Every non-zero integer has two or more multiples.
What are the odds of throwing a six on a dice two times?
If you roll the die often enough, it is certainty.
On just two rolls and if the die is fair, the probability is 1/36.
If calculators should be permit in exams?
no, not unless the numbers are very large/complex or they have a lot of decimal places.
The first odd number is 1, the second is 3, the third is 5, fourth is 7, fifth 9, sixth is 11, ... so the 763rd is 1,525
The formula is X = (n x 2) -1
e.g.
* (1x2) -1 = 1 * (2x2) -1 = 3 * (3x2) -1 = 5 * (4x2) -1 = 7 * (5x2) -1 = 9 * etc
* etc
* (763x2) -1 = 1,525 An easy way to think about it is to consider the progression of even numbers:-
The first even number is 2, 2nd = 4, 3rd = 6, 4th = 8, 5th = 10, 6th = 12 etc
Notice that the end result is always twice the ordinal number. i.e. X = (n x 2)
The sequence of odd numbers is always 1 less than the even number sequence. (See list above) Therefore the formula for odd numbers is X = (n x 2) -1
How many feet are there in 26.03 kilometers?
There are 0.0003048 kilometres in one foot. Therefore, rounded to two decimal places, 26.03 kilometres is equal to 26.03/0.0003048 = 85400.26 feet.
