Need the correct answer as i am practicing with the reference book and the answers are not available i have done the solution but need to confirmed the answers.

Normal Distribution is symmetric is about ___________

1. Variance
2. Covariance
3. Mean
4. Standard deviation

E(X) = and V(X) = 2is for which distribution?

1. Poisson's
2. Bernoulli's
3. Binomial
4. Normal

In which of the following types of sampling the information is carried out under the opinion of an expert?

1. purposive sampling
2. judgement sampling
3. quota sampling
4. convenience sampling

Normal Distribution is also known as ___________

1. Laplacian Distribution
2. Gaussian Distribution
3. Cauchy's Distribution
4. Lagrangian Distribution

The standard normal curve is symmetric about the value ___________

2. 0.5
3. 0
4. 1

A bag contains 6 balls of different colours. A student selects 2 balls at random without replacement. Find all possible combinations of the colours of the selected balls.

1. 14
2. 16
3. 15
4. 13

Sampling error increases as we _____________ the sampling size.

1. increase
2. Not depend upon sample size
3. None of the above
4. decrease

The difference between the sample value expected and the estimates value of the parameter is called as?

1. bias
2. difference
3. error
4. contradiction

Any population which we want to study is referred as?

1. standard population
2. target population
3. final population
4. infinite population

The value of constant 'e' appearing in normal distribution is ___________

1. 2.5185
2. 2.7183
3. 2.1783
4. 2.7836