DAC DAC Statistical Methods & Analytics 1

Question 1

What does the term 'mean' refer to in descriptive statistics?

Accepted Answer

The arithmetic average of all values

Answer

The most frequently occurring value

Answer

The middle value when data is sorted

Answer

The difference between the highest and lowest values

Question 2

Which measure of central tendency is most resistant to the influence of extreme outliers?

Accepted Answer

Median

Answer

Mean

Answer

Variance

Answer

Standard deviation

Question 3

In hypothesis testing, what does a p-value less than 0.05 typically indicate?

Accepted Answer

There is statistically significant evidence to reject the null hypothesis

Answer

The null hypothesis is definitely true

Answer

The sample size is too small

Answer

The data is normally distributed

Question 4

What does standard deviation measure in a dataset?

Accepted Answer

The average distance of data points from the mean

Answer

The most common value in the data

Answer

The total range of values

Answer

The correlation between two variables

Question 5

Which type of correlation coefficient is used to measure the linear relationship between two continuous variables?

Accepted Answer

Pearson's r

Answer

Spearman's rho

Answer

Chi-square

Answer

Cramer's V

Question 6

What is the purpose of a confidence interval in statistical analysis?

Accepted Answer

To provide a range of values likely to contain the true population parameter

Answer

To determine the exact population parameter

Answer

To test whether two groups are significantly different

Answer

To measure the spread of a single variable