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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
No, many crimes go unreported and often undiscovered. Statistics on crime only deal with the information available at the time.
There are many strengths and limitations to official statistics such as the British Crime Survey (BCS) and the Official Crime Survey (OCS).
Official statistics surprisingly do not reveal the full extent of the crime that happens in Britain, the left over crime that is not known to the public as a whole or shown in the OCS, is called the 'dark figure of crime'. However the BCS goes a little further to reveal some of the 'dark figure of crime' in the fact that the victims of crime are interviewed, rather than the police reporting the crime. This in itself has strengths and limitations such as the fact that the no one under the age of sixteen is interviewed for the BCS meaning that the results are not one 100% representative. Also the police may choose not to report because, for example, the crime is seen as too 'trivial/minor' and people sometimes don't actually report a crime to the police as they may be too embarrassed, i.e. when men are abused by women or for fear of reprisals, thus some crimes don't appear in the statistics.
The BCS gives a more accurate picture of the true extent of crime because it compares police data with the BCS. This is highly advantageous as the BCS has a very large stratified sample of 650 interviews in each police area and also boost samples. A boost sample is when not-white minority ethnic groups are interviewed for the BCS as numbers in the main sample may not have been high enough to draw conclusions. The response rate for the BCS is also very good (80 %+).
Difference between discrete and continuous?
A continuous variable is one that can take any value within an interval (or a set of intervals). A discrete variable is one that can only take certain values.
Some further notes:
* Often a discrete variable takes integer values, but that is not necessary.
* Neither discrete nor continuous variables need be limited to a finite number of possible values.
* Frequently, continuous variables are continuous only in principle, and the measuring instruments or recording make them discrete. Eg your height is continuous but as soon as it is recorded as 1.75 cm or 5'9", it is made discrete.
What are Chile's birth and death rates?
Chile's birth rate is 14.46/1000 (July 2010 estimate).
Chile's death rate is 5.9/1000 (July 2010 estimate).
it is the same as the English word "Daedal" which means skillful or ingenius
dei means ingenius. dara means clay.
I don't know where the previous answerer got his Japanese but wrong.
Dei means day and Ara means flaw. Also the word Deido means mud so it may be an adaptation of the word for mud as his art is made of clay
A frequency is when a number occurs the most like m i s s i s s i p p i m1 i 4 s 4 p2 i is the frequency
The following is a good discussion of the phrase: http://listserv.linguistlist.org/cgi-bin/wa?A2=ind0304a&L=ads-l&P=7859
What is a three digit number starting with 3 that is a multiple of 7?
301, 308, 315, 322, 329, 336, 343, 350, 357, 364, 371, 378, 385, 392, 399.
What is the median to 8 numbers?
Sort the numbers, and pick the number in the middle. In this case, since you have an even number of numbers, take the average of the two numbers in the middle.
Can there be no mode in a set?
Not generally useful. With a set we usually mean a collection of unique elements. The mode of a collection is the element found to be most frequent. Trivially, one could perhaps say the mode of a set is always the set itself (each element representing an answer). Note that the term 'dataset' often used in statistics is not a real set.
What happens when there is no median in a set?
There's is always going to be a median. Never is there not going to be a median.
How many 3 number combinations?
That depends on a few factors:
A) How many unique digits can go into each slot?
B) Can a number be repeated? (eg. is 112 invalid because the 1 is used twice?)
C) Does order matter? (eg. is 123 the same as 132)
Assuming n=10 digits and r=3 slots
If repeats are allowed, then we get 10 possible items in the first slot. Since repeats are allowed, we also have 10 in our second slot, and 10 in our third. We don't have to cancel any out because of their ordering.
10 * 10 * 10 = 1000 = 103 = nr
If repeats are not allowed (let's say we have a bag of 10 pieces, each with a number on it. Once you've used a piece, you can't use it again), we can put any of 10 digits in the first slot, any of the 9 remaining in the second slot, and any of the 8 remaining in the third slot:
10 * 9 * 8 = 720 = 10!/7! = n! / ( n - r )!
If order doesn't matter, you'll need to cancel out any combination that is already represented, and there are formulas for that, but explaining it here might be a bit beyond the scope of the question. You'll find a more detailed lesson in combinations and permutations here:
See link below for more lessons on combinations and permutations
How many six are in a deck of cards?
4:
6 of Spades
6 of Diamonds
6 of Hearts
6 of Clovers
Four (4). One of each suit.
995
Factor that is changed it is a dependent variable or independent variable?
Its the independent one; because you change it, the dependent variable will be affected.
What is the mean of 18 23 39 10 17 16 and 15?
sum = 138
sample size = 7
138 / 7 ~= 19.714285714285715
How do you calculate the skew?
Skew applies to the average difference between two timing states of a single signal as it transit from low to high and high to low. Skew is frequently refereed to as the Pulse Width Distortion (tpHL-tpLH). When multiple independent and equal device types are used for parallel data transmission, the skew of each device is important since the max and mix Skew can establish the maximum data rate.
