/    /  Statistics – Interview questions Part 1

1. What Is Bayesian?

Answer: Is a condition on the data, actually observed and consider the probability distribution on the hypotheses.


2. What Is Frequentist?

Answer: Is a condition on a hypothesis of choice and consider the probability distribution on the data, whether observed or not.


3. What Is Likelihood?

Answer: The probability of some observed outcomes given a set of parameter values is regarded as the likelihood of the set of parameter values given the observed outcomes.


4. What Is P-value?

Answer:When we execute a hypothesis test in statistics, a p-value helps us in determine the significance of our results. These Hypothesis tests are nothing but to test the validity of a claim that is made about a population.

– If the p-value is less than 0.05 or 0.01,

corresponding respectively to a 5% or 1% there is a chance of rejecting the null hypothesis when it is true.


5. What Is Sampling?

Answer: a Sample is nothing but a set of or a portion of collected or processed data from a statistical population by a structured and defined procedure and the elements among the sample are known as a sample point.


6. What is the difference between “long” and “wide” format data?

Answer:  Let’s see the difference between “long” and “wide” format data

1. wide format: It is deals with subject’s repeated responses will be in a single row, and each response is in a separate column.

2. long format: In which each row is a one-time point per subject.

In which you can recognize data in wide format by the fact that columns generally represent groups.


7.  What do you understand by the term Normal Distribution?

Answer:  Data is usually distributed in different ways with a bias to the left or to the right or it can all be jumbled up.

Though, there are chances that data is distributed around a central value without any bias to the left or right and reaches normal distribution in the form of a bell-shaped curve.

The random variables are distributed in the form of a symmetrical bell-shaped curve.

Properties of Normal Distribution:

1. Unimodal -one mode

2. Symmetrical -left and right halves are mirror images

3. Bell-shaped -maximum height (mode) at the mean

4. Mean, Mode, and Median are all located in the center

5. Asymptotic