In a normal distribution E(X-µ)2 is________________?

Related Mcqs:

1. If the sampled population has a normal distribution, when is the sampling distribution of the sample mean X also a normal distribution ?

   A. Only when the sample size is at least 100.
   B. Only when the sample size is smaller than 30
   C. Always
   D. Only when the sample size is at least 30.

2. Normal distribution is a probability distribution of _____ random variable?

   A. Continuous
   B. Constant
   C. Discrete
   D. Normal

3. Normal distribution is the distribution of _______________?

   A. Discrete r.v.
   B. Continuous r.v.
   C. Qualitative variable
   D. Quantitative variable

4. Normal distribution is _____ distribution?

   A. Symmetrical
   B. non-symmetrical
   C. + vely skewed
   D. -vely skewed

5. We use normal distribution when “n” is________________?

   A. Small
   B. None
   C. Fixed
   D. Large

6. If in a sampling distribution of X the sample size is 25, what assumption must hold for the sampling distribution of X to be normal ?

   A. Population distribution is normal
   B. μ1 = μx
   C. Population distribution is uniform
   D. σx = σx /√n

7. condition for applying Central Limit Theorem (CLT) which approximate the sampling distribution of the mean with a normal distribution is ?

   A. n > 30
   B. N(1 – p) > 5
   C. 2 n 5
   E. N < 30

8. __________ of the distribution which is measured relative to the distribution known as Normal?

   A. Skewed
   B. Flatness
   C. Normal
   D. Moment

9. Every distribution tends to ____ distribution?

   A. Small
   B. ∞
   C. Large
   D. Finite

10. The area under the normal distribution curve outside the interval of z=1 and z=3.09 is_____________?

    A. 0.1477
    B. 0.1597
    C. 0.3413
    D. None of These