/    /  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