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What does it mean is the error bars overlap?
A large overlapping error bar may mean the results are little relationship with each other
Do intelligence tests tell you how smart you really are?
There is a great amount of variation in the results of IQ tests. Firstly, a person can score different each time they take it, based on their surroundings and mindset. And some tests may just be slightly skewed toward a particular person's world view. Also, even if the IQ consistently say your friend's IQ is higher, that doesn't mean they are smarter. It only means their IQ is greater. There are many different kinds of intelligence that are not measured by an IQ test, such as emotional intelligence, social intelligence, and kinesthetic intelligence.
What part of a filet weld that can be convex or concave?
The 'face' of the weld may be slightly convex, flat, or slightly concave.
How may different 4 digit numbers can be made from the digits 1 2 3 and you have to use each number at least once?
36 of them.
Explain the difference between scalars and vectors?
A scalar is simply a real number (sometimes complex numbers are used). A vector has both a magnitude (a number), and a direction. Examples: Mass is a scalar; a force is a vector (you may get different results if you pull in different directions).
