CBDA Statistical Analysis & Methods 2

Question 1

Which sampling method ensures that every member of the population has an equal chance of being selected?

Accepted Answer

Simple random sampling

Answer

Convenience sampling

Answer

Quota sampling

Answer

Purposive sampling

Question 2

A CBDA analyst wants to compare average customer satisfaction scores across three or more business regions. Which statistical test is MOST appropriate?

Accepted Answer

One-way ANOVA

Answer

Paired t-test

Answer

Chi-square test

Answer

Pearson correlation

Question 3

What is 'multicollinearity' and why is it a concern in multiple regression analysis for business analysts?

Accepted Answer

When independent variables are highly correlated with each other, inflating coefficient estimates

Answer

When the dependent variable has multiple modes

Answer

When residuals are not normally distributed

Answer

When the sample size is smaller than the number of predictors

Question 4

In descriptive statistics, what does the interquartile range (IQR) measure?

Accepted Answer

The spread of the middle 50% of data values

Answer

The difference between the mean and median

Answer

The variance of the entire dataset

Answer

The range between the minimum and maximum values

Question 5

A business analyst uses stratified random sampling when analyzing customer data. What is the PRIMARY advantage of this approach?

Accepted Answer

It ensures proportional representation of key subgroups in the sample

Answer

It is faster and cheaper than simple random sampling

Answer

It eliminates the need for a sampling frame

Answer

It guarantees a larger sample size

Question 6

Pearson correlation coefficient (r) ranges from -1 to +1. What does a value of -0.85 indicate?

Accepted Answer

A strong negative linear relationship

Answer

A weak positive linear relationship

Answer

No relationship between the two variables

Answer

A non-linear relationship