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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 the 'sample' in and experiment?
A group selected from a population for observation in a study.
That definition comes directly from the glossary in my research in education textbook. In other words, I think you want to define the people in the study.
Tommy flips a coin four times How many ways can he get three heads and one tail?
There are 4 ways to get 3 heads and 1 tail for 4 coin flips. They are: THHH, HTHH, HHTH & HHHT.
What is value of 1 to 15 if 5 percent equals 74?
.05x=74
74/.05 = x
x = 1480
100% is 1480, 1/15 is 6.6666% so 6.666% of 1480 = 98.666
98.6666
Where is a coefficient located?
A coefficient is the number in front of a variable. For example, consider the expression '2y'
y is the variable
2 is the coefficient
schedule,coast,and quality
How many 3 digit numbers are formed from 1234567?
If repetition is allowed . . . . . 343
If repetition is not allowed . . . . . 210
In order to be divisible by both 2 and 5, the number must be divisible by 10.
That pretty well means that the last digit always has to be zero.
We're also going to assume that since each number must be a 5-digit, leading zeros
are ruled out.
First digit . . . . . 2, 3, 4, 5 . . . . . 4 possibilities
Second digit. . . 0, 2, 3, 4, 5 . . . 5 possibilities
Third digit. . . . . 0, 2, 3, 4, 5 . . . 5
Fourth digit . . . 0, 2, 3, 4, 5 . . . 5
Fifth digit . . . . . 0
Total number of possibilities = 4 x 5 x 5 x 5 = 500
How many number combinations of 6 numbers are possible from 17 numbers?
If they can repeat, then: 17^6=24,137,569
If they can't repeat, then: 17*16*15*14*13*12=8,910,720
How many different possible outcomes are there when four 10 sided dice are rolled at the same time?
There are 104, or 10000 permutations of four 10 sided dice.
What does frequency mean in relation to alternating current?
Alternating current (AC) continually flows in one direction then it changes direction and flows the other way. This switching back and forth creates what is called a sinusoid or sine wave. Frequency is the rate of this back and forth switching in alternating current. Frequency is measured in Hertz (Hz) which is the number times a wave switches back and forth PER SECOND or better described as CYCLES PER SECOND.
How many even four digit numbers can be made using 0235 and 6 where the first digit is not 0?
For the number to be even it must end with either 0, 2 or 6.
As there is a limitation of the number starting with 0, consider those ending with 0 separately from those ending with 2 or 6 and add together the results
Ending with 0:
1st digit has a choice of 4 possible digits; for each of these
2nd digit has a choice of one of the 3 remaining non-zero digits; for each of these
3rd digit has a choice of one of the 2 remaining non-zero digits; for each of these
4th must be 0 and only 1 choice
numbers = 4 x 3 x 2 x 1 = 24
Ending with 2 or 6:
The 4th digit has a choice of 2; for each of these
1st digit has a choice of 3; for each of these
2nd digit has a choice of 3; for each of these
3rd digit has a choice of 2
numbers = 2 x 3 x 3 x 2 = 36
Total ways = 24 + 36 = 60 possible numbers.
How do you find out the width of a box and whisker plot?
The sides of the box are the quartile values: the left is the first quartile and the right is the third quartile. The width, therefore is the interquartile range.
Is the time taken to run 10 kilometers discrete or continuous variable?
It is a continuous variable. BUT as soon as you measure it, the limitations of your timing device make the observation a discrete variable - even if you can measure with an accuracy of a nanosecond.
What is the formula for q correlation?
Once you have figured out all the quadrants and their respective values, use:
q=a+b-c-d/a+b+c+d
For example if:
a=6
b=3
c=4
d=2
q=6+3-4-2/6+3+4+2
=3/15
