How we may handle the data is irrelevant in context of the question, as mentioned earlier. The question is not " what you would generally assume". The question is 'what is what' by definition. You 'assume' a variable to be distributed normally does not imply the variable is continuous, you just...
I was trying to go by analyzing the definition. The question is not intended for the answer that " what should we assume for convenience of inference making". Logic, yes it is the base of my understanding. Photons exist as very small discrete packets, solving and generating big questions...
Agree with you. For all advanced studies or inference they are taken as continuous without problem. But, in the introductory discussion one may allow the other aspects of the idea to have a complete picture.
The question is simply posed as " identity the variables as discrete or continuous. 1) Mark of a student in an examination. 2) Family income."
What I think:
1) There must be a minimum gap between two possible consecutive marks that the examiner can assign. Eg. Suppose that there are N students...
I see no relation between p1 and p2 in the proposed context of testing. pi= prob of head of coin i. Why you do not think of testing them separately. Note that you have to specify the level of significance (α) before hand. To perform a test of size exactly = α, we generally have to do a...
Homework Statement
S = 1+ x/1! +x2/2! +x3/3! +...+xn/n!
To find S in simple terms.
Homework Equations
None
The Attempt at a Solution
I tried with Taylor's expansion, coshx and sinhx expansions. But cannot see consequence.
More often than not, inverse function of a CDF is not analytically solvable in terms of simple functions. We have to use a computer program for numerical solution.
Suppose, f(x)= f(x,μ,σ) is your curve with known mean (μ) and sd (σ) and f(x)≥0. Find C=∫Xf(x)dx, -∞<x<∞. Draw a 3 digited (say) random number and put a decimal point before it. Let this fraction be R. Find x by solving ∫-∞x f(x)dx/c =R. x is now a sample form f(x).
Suppose we have monthly totals of observed data for last 35 years. That data is of inflow of a river in a reservoir and monthly demands from the reservoir. We are interested to check the effect of construction of a dam in the upstream. The effect is, whether the downstream reservoir will have...
Actually, I added the case of x=2 on the basis of the given prob condition (third item is red with prob x/2-1=0). A non existent item (here, the third sweet) can as well be drawn with prob=0 (which, in turn implies, it is impossible to draw it).
You may use z scores with arbitrary origin and scale. Let X & Y be the two series. Calculate z from (x-μx)/σx=( z-c)/d and from (y-μy)/σy=( z-c)/d, for all observed x and y, where c & d are arbitrary. μ,σ are mean and sd etc. The z values are now comparable.
I think, we have to deduce that 0≤x/2-1≤1. ⇒2≤x≤4. Again three sweets are already drawn⇒3≤x≤4. Now consider Case1: x=3. Therefore, prob of third being sweet is red is either 0 or 1 (according as last sweet left in box non red or red after withdrawal of 1st two). This does not satisfy the given...
Well, I got it. a=-3/5√2 and b= -4/5√2.
Actually I mentally calculated the minimum of 3a+4√(1/2-a^2) is at a=1/2 and that was the mistake. Since, our minimum could be the min of 3a-4√(1/2-a^2).
Homework Statement
Given a,b,c real and a^2+b^2 +c^2=1, to find the minimum of c(3a+4b)
Homework Equations
The Attempt at a Solution
No positive clue yet.
Homework Statement
For a,b,c,d >1, Show that (a+1)(b+1)(c+1)(d+1) < 8(abcd+1)
Homework Equations
How to show this?
The Attempt at a Solution
I could show for two variables, (a+1)(b+1)<2(ab+1). Tried C-S, AM-GM inequalities in different form and variable transformations. But still no result...
Skewness is one character of the data set, average is another character- measure of central tendency. For moderately skewed distributions 3(mean-median)≈ (mean-mode). You can choose your measure of central tendency which suits your requirement the best. Note that, median will imply equal no. of...
Thanks for your response. So, we can start with 2>1.96 and calculate 514 and 710. But this is not the answer I was looking for. Actually this can be done using standard inequalities (it's my guess only).
Came to know about the following problem from a friend which can be simplified to the following:
A1, A2, ....Am and B1, B2,...Bn are two groups of sets each group spanning the sample space.
Now there are p elements in each of Ai and each element is in exactly p1 of the sets of the A group...
Homework Statement
Suppose light from is moving from water to air. The critical angle be θ i.e. for angle of incidence θ, the angle of refraction is 90°. Refractive index of water wrt air be μ.
Suppose the angle of incidence (i) is increased by 1° to θ+1. What happens to the...