# (Solved): WPC 300 - Quiz 2 Questions...

**Question 1**

Standard deviation of a normal data distribution is a ___________________

- Measure of data quality
- Measure of data centrality
- Measure of data shape
- Measure of data dispersion

**Question 2**

Which of the following is true about A/B testing?

- To increase conversion rate of your website traffic, A/B testing can be beneficial.
- You should test multiple elements of your landing page at a time and compare
- A neutral result on an A/B testing means you correctly performed the test
- You need to attend WPC 300 course to learn about A/B Testing

**Question 3**

In the experimental design example "IQ Water", students are called

- Experimental units
- Treatments
- Measurement units
- Response variable

**Question 4**

A researcher wants to find out if lack of exercise leads to weight gain. Which of the following variables could be considered as a confounder?

- Time of exercise
- Age
- Exercise level
- Weight

**Question 5**

In inferential statistics, a _____________ is used to infer about a ______________.

- Population, sample
- Sample, population
- Sample, significance
- Population, significance

**Question 6**

Regular consumptions of organic food will keep you in a good mood. In this example, the confounder could be

- Money
- organic food
- people's mood
- work ethics

**Question 7**

What are the three principles of describing data?

- center, spread and shape
- Centrality, dispersion and size
- Dispersion, range and standard deviation
- Mean, median and mode

**Question 8**

For a normal distribution mean is _____________ median.

- sometime equal to
- Greater than
- Less than
- Closely equal to

**Question 9**

When two variables are highly positively correlated, the correlation coefficient will be ______________

- Close to 0
- Close to -1
- Close to 1
- Close to 10

**Question 10**

What is the first step of running an A/B testing to improve website visits?

Hint: What do you do in any experimental design, in this case, design for A/B testing?

- Making assumptions about the behavior of the visitors to the site
- Establishing your success metric to improve site visits
- Establishing the conversion rate from the site visit
- Creating three variations for your landing page elements