Question

There can be both positive and negative correlations between variables that are statistically significant enough to validate causation.

	True
	False

Symmetrical data results in descriptive statistics that demonstrate little variance

	True
	False

In matters of ranking results on exams, and other tools to measure performance, percentiles are a good method to assess performances within a cohort.

	True
	False

Floors and ceilings rarely give consumers a true picture of cost paid by suppliers.

	True
	False

Answer 1

1.True:
There can be both positive and negative correlation between the variables which validates their causation.Negative correlation implies that the two variables will move in two opposite directions.If two variables X and Y are negatively correlated implies that if X increases in value then Y will decrease.If the two variables are positively correlated both variables will move in the same direction.If two variables X and Y are positively correlated then if X increases Y will also increase.

2.True
The data is said to be symmetrical when the values of variables are occurring at regular frequencies and when mean median mode all the three central tendencies occurs at one point.Hence the symmetrical data will show only little variance or no variance .Variance is said to occur when there is large deviation from mean

3.True
Percentiles are good measure to assess the relative performance of one individual compared to another individual. While calculating the percentiles we will rank the values in the data set in order from smallest to largest

4.True
The floor and ceiling price will give an idea about the cost charged by the supplier.It represents the cost charged by the supplier and not the cost paid by the supplier.Celiling price is the maximum price the suppliers can charge upon the consumers