0
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 the width and height of a normal distribution curve?
By standard practice, the normal distribution curve should be normalized so that the area under the curve is 1. This results in a height, at the mean, of about 0.4, i.e. the probability of a sample value being equal to the mean is 40 percent.
The width of the normal distribution curve is infinite, as the tails are asymptotic to the X axis. It is easier to understand that the +/- one sigma area is 68.2 percent, the +/- two sigma area is 95.4 percent, and the +/- three sigma area is 99.6 percent.
How many different 7 digit numbers can be made if the number does not start with zero?
9*10*10*10*10*10*10 or 9 million.
How do you work out the median from an even set of numbers?
if you had these numbers; 0 1 2 3 4 5 6 7 8 9
and you crossed off all the numbers to get 4 and 5
the median would either be the number between them; 4.5
or you could say there is no median; nm
hope this helps :D
What techniques plus tools are used in inferential statistics?
There are many techniques. The main tools are human ingenuity, the human brain and calculators.
What is the difference between a digit and a number?
A digit is part of a number. the number 23 has two digits 2 and 3.
A favorable variance is the difference between the budgeted or standard cost and the actual cost. If the actual cost is less than budgeted or standard cost, it is a favorable variance.
You put all the numbers in order(smallest to largest) then cross off the first the last then the second then the second to last and so on the middle number is the median.
How do you calculate mean median and mode?
The median is the middle number of any given set when they are in order, least to greatest. If there is an even number of values, the median is the average of the middle two.
Ex. (10, 17, 20, 45, 68)
The median is 20.
In any given set, the mode is the number that appears most often. If no number appears more frequently than any other, there is no mode.
Ex. (10, 17, 20, 45, 68)
This set has no mode.
In any given set, the mean is the average, which is the total of the numbers divided by how many numbers there are.
Ex. (10, 17, 20, 45, 68)
68 + 45 + 20 + 17 + 10 = 160
There are 5 numbers in this set.
160/5 = 32
The mean is 32.
What type of graph do you use that shows information using percentages?
For only one set of percentages a pie chart but if more than one then a stacked bar chart.
How would you show a bar with height 13 on this graph?
The answer will depend on what "this graph" is!
A statistical variable is any set of observations in which the observations can be different. They need not be numeric or even ordered: for example, people's first names or the colour of cars. They can be ordered but still not numeric: for example, questions where you are asked to say whether you strongly disagree, disagree, are neutral, agree or strongly agree. Or they can be numeric, for example your age or height or a combination of your height and mass in the form of your BMI.
Essentially, it is any characteristic that can be "measured", and measured does not mean only in numeric terms.
Example of things that weigh pounds?
Almost anything can be weighed in pounds. For example, you can have a pound of sugar, a ten-pound weight for lifting while working out, or a 50-pound television set.
They help when you shop, so if there's a discount on something, you can figure out what it's new price will be. For example, if a 20 dollar item is discounted 10%, you know that 10% of 20 is 2, and so you take 2 away from 20 and the new cost of your 20 dollar item is $18.
What is the fifth and 9fifth percentiles?
The 50th percentile is average. The 5th is way below and the 95th is way above.
The 5th and 95th percentiles are the lines that set of the "edges of the curve" in a distribution over a bell curve. If you draw the bell, and mark the 5th and 95th percentile spots, those marks separate the bulk of the curve from its edges. The 5th percentile sets off the bottom edge and the 95th percentile sets off the top edge of the curve.What does complementarity mean?
"Complementarity" may be "the property of being complementary" or something like that. In geometry, two angles are said to be complementary if their sum is equal to 90 degrees. For example, 30o and 60o are complementary because 30o + 60o = 90o. There are also a number of other applications of the term "complementary" in mathematics. One more might be its use in probability and statistics. If the sum of two probabilities is one, they are said to be complementary. Here's a killer example: On a given coin toss, the probability of a head coming up is complimentary to the probability of a tail coming up. The actual formula is P(A) + P(B) = 1 In a quickie review of probability as it is used here, if something cannot possibly happen, the probability of it happening is zero. If something absolutely will occur without any possibility of anything else happening, the probability of that event happening is one. So probabilities range between zero and one (inclusive). The probability of a head coming up in a coin toss is one 1 in 2, or 50%, or 0.5 (speaking in mathematical terms of probability). The probability of a tail is the same (0.5). Let's just do a quick math thingie with that and get it to lock in: Probability of a head = Ph = 0.5 Probability of a tail = Pt = 0.5 Ph + Pt = 0.5 + 0.5 = 1.0 Ph and Pt are said to be complementary, since Ph + Pt = 1.0
You can create an index for a table to improve the performance of queries issued against the corresponding table. You can also create an index for a cluster. You can create a compositeindex on multiple columns up to a maximum of 32 columns. A composite index key cannot exceed roughly one-half (minus some overhead) of the available space in the data block.
Use the SQL command CREATE INDEX to create an index. CREATE INDEX emp_ename ON emp_tab(ename);
it is treating somthing as though it could break just by tuching it with anger
How many combinations can you get out of a six digit code?
it's 610, which is 60,466,176. Since each digit spot could be anything 0-9 there are 10 numbers to try for each digit, making it 610.
