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

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

Correct! Wrong!

Higher variance densities are more dispersed than lower variance densities.

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

Correct! Wrong!

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

#### Identify the error in the statement.

Correct! Wrong!

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

#### Identify the accurate statement.

Correct! Wrong!

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

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

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

#### Identify the accurate statement.

Correct! Wrong!

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

#### Identify the accurate statement.

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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?

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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?

Correct! Wrong!

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.

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

#### Identify the accurate statement.

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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?

Correct! Wrong!

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.

Correct! Wrong!

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

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

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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 .

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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.

Correct! Wrong!

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