# FREE Master of Data Science: Statistical Inference & Regression Models Questions and Answers

#### Which of the following describes a random variable's spread?

Higher variance densities are more dispersed than lower variance densities.

#### Which one of the following random variables has a finite number of possible outcomes?

Any value on a portion of the actual line can be assigned to a continuous random variable.

#### Identify the error in the statement.

It becomes twice continuously differentiable at the knot sites when cubic terms are included.

#### Identify the accurate statement.

Data "normalization" is the process of scaling and centering the data.

#### Who among the following scientists created the Gosset's distribution?

The degrees of freedom are used to index the Gosset distribution.

#### Identify the accurate statement.

Each and every cumulative distribution function F is right-continuous and non-decreasing.

#### Identify the accurate statement.

The probability that an event would recur frequently over a lengthy period of time in independently distributed repetitions is known as frequency probability.

#### Given that beliefs adhere to specific laws, which of the following best describes the probability calculus of beliefs?

Data scientists frequently err on the side of these and other schools of judgment in gray areas.

#### Which of the aforementioned is a random variable?

The probability that an event would recur frequently over a lengthy period of time in independently distributed repetitions is known as frequency probability.

#### The term "_______ deviation" refers to the square root of variance.

The deviation of a set of numbers from its mean value is measured by the term "standard deviation" (SD).

#### Identify the accurate statement.

Being consistent is neither a prerequisite nor a sufficient condition for one estimator to be superior to another.

#### Which of the following suggests there is no association between any of the relationships?

A statistical method called correlation can be used to determine if and how strongly two variables are related to one another.

#### The degrees of freedom in the Chi-squared distribution are twice as many.

The Chi-degrees squared's of freedom are represented by its mean.

#### Which of the following is an illustration of Poisson distribution use?

For counts and rates, the Poisson distribution is a suitable model.

#### The center of the distribution of a random variable is its anticipated value, or .

Using presumptions, a probability model links the data to the population.

#### Centered at ___, normalized data have units equal to the standard deviations of the original data.

Normalization can refer to a variety of concepts in statistics and statistical applications.