Data and Analytics Statistical Analysis

Question 1

What does the p-value represent in hypothesis testing?

Accepted Answer

The probability of observing results as extreme as the data if the null hypothesis is true

Answer

The probability the null hypothesis is true

Answer

The effect size of the tested variable

Answer

The confidence interval width

Question 2

What is the mean of the dataset: 4, 8, 6, 10, 12?

Accepted Answer

8

Answer

7

Answer

9

Answer

10

Question 3

What does standard deviation measure?

Accepted Answer

The average distance of data points from the mean

Answer

The middle value in a dataset

Answer

The most frequent value in a dataset

Answer

The range between minimum and maximum values

Question 4

What type of correlation does a Pearson coefficient of -0.85 indicate?

Accepted Answer

Strong negative correlation

Answer

Strong positive correlation

Answer

Weak positive correlation

Answer

No correlation

Question 5

What is a Type I error in hypothesis testing?

Accepted Answer

Rejecting a true null hypothesis

Answer

Failing to reject a false null hypothesis

Answer

Accepting an incorrect alternative hypothesis

Answer

Using the wrong statistical test

Question 6

Which measure of central tendency is most resistant to outliers?

Accepted Answer

Median

Answer

Mean

Answer

Mode

Answer

Range