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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
What is the definition of weight?
The weight of an object, in a gravitational field, is a force that is equal to the mass of the object multiplied by the acceleration due to gravity.
Weight is the vertical force exerted by a mass as a result of gravity.
Weight can be expressed mathematically as
Fw = mg
where,
Fw = force, or weight, resulting from an accelerating object
m = mass of an object
g = acceleration due to gravity
This equation is a variation of Newton's second law of motion. In the general form of the equation the variable g is replaced by the variable a which stands for any acceleration acting on an object with mass. Whenever an acceleration is caused by gravity, the force on that object is called it's weight.
The weight of an object should not be confused with the mass of an object. The mass of an object is constant no matter where in the universe the object is located, but it's weight can vary in different places because the force of gravity can vary depending on location.
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What is on the back side of a penny?
There is a design of the Lincoln Memorial in Washington D.C. on the back of the penny. Also are the words "United States of America" and "E Pluribus Unum" and, lastly "One Cent".
Most People believe that the safest car is a Ford. I would say that a Ford and Volvo is within the top 5 for the safest automobile. One car that is consistently in the top spot however is the Ford Taurus and the Volvo C70. I believe ever since Ford bought Volvo, they have been using all of Volvo's safety plans. I work on cars for a living and when I see a car wreck and its a Taurus it always looks like the people inside weren't hurt.
I would rank them
in this order
Volvo and Ford tied for first which is what the IIHSA data concludes, then Honda, Toyota, GM the rest out there just plain don't count
A Honda Accord is pretty safe to, that's why it's expensive to buy.
I have a Volvo and it's a very safe car, but once again, it is expensive.
How do you linearize a nonlinear spring?
Using Lumped Element Modeling, Taking Energy & Co-energy and integrating them
A dime and a penny are tossed and one dice is rolled what is the total number of possible outcomes?
There are 2 outcomes for the dime (H or T), 2 for the penny (H or T) and 6 for the die (1,2,3,4,5,6). In all, there are 2*2*6 = 24 outcomes. Some of them are given below in the pattern: dime, penny, die. The rest are easy to generate.
[H,H,1], [H,H,2], ... , [H,H,6],
[H,T,1], [H,T,2], ...
[T,H,1], ...
[T,T,1], ...
36 because multiply the amount of numbers by the biggest number or something :) sorry for the caps lock
That depends. In a large enough business simply hiring the necessary statisticians is probably a better choice. In very small businesses the knowledge of statistics will probably be only a diversion that consumes time and effort better spent on other things and the budget would not permit hiring such specialists. It might be helpful in certain businesses of medium to medium-large size.
What does data computation mean?
It is describing the process of processing data to compute a result. Could be any type of model or report, or a basic mathematic calculation.
What is multiple and partial correlation?
multiple correlation: Suppose you calculate the linear regression of a single dependent variable on more than one independent variable and that you include a mean in the linear model. The multiple correlation is analogous to the statistic that is obtainable from a linear model that includes just one independent variable. It measures the degree to which the linear model given by the linear regression is valuable as a predictor of the independent variable. For calculation details you might wish to see the wikipedia article for this statistic.
partial correlation: Let's say you have a dependent variable Y and a collection of independent variables X1, X2, X3. You might for some reason be interested in the partial correlation of Y and X3. Then you would calculate the linear regression of Y on just X1 and X2. Knowing the coefficients of this linear model you would calculate the so-called residuals which would be the parts of Y unaccounted for by the model or, in other words, the differences between the Y's and the values given by b1X1 + b2X2 where b1 and b2 are the model coefficients from the regression. Now you would calculate the correlation between these residuals and the X3 values to obtain the partial correlation of X3 with Y given X1 and X2. Intuitively, we use the first regression and residual calculation to account for the explanatory power of X1 and X2. Having done that we calculate the correlation coefficient to learn whether any more explanatory power is left for X3 to 'mop up'.
How does 170 change the mean median mode and range?
Prior to the introduction of 170, the mean, median, mode and range did not exist since there were no numbers at all.
Once 170 is introduced, it becomes the mean, median and mode. The range is zero.
What is the difference between curve fitting and regression?
curve fitting is a very difficult and time wasting method while regrresion is more to use as compare to curve fitting
24 if order of outcomes doesn't matter (i.e. blue 6 is the same as 6 blue).
How many three digit numbers would round off 720?
It depends on the degree to which you are rounding.
To the nearest 60 (eg minutes to hours) there are 60 including itself.
To the nearest 30 (eg days to approx months) there are 30 incl itself.
and so on.
A perfect demonstration of why the hyphen is necessary. if the word had been written co-tenant it would be quite clear that it means somebody who shares a tenancy: 'The roommates were co-tenants of the apartment'.
