Sally estimated that her call would take 21 minutes but it actually took 15 minutes. What was her percent of error?

a] 21%
b] 28.6%
c] 33.3%
d]40%

2] Casey performs a survey to determine what students think about the sale offers in her store. Which is an unbiased representative sample of the population?

a] every tenth customer that does not buy something
b] the first 30 customers that do buy something
c] every twentieth customer that enters the store
d] the first 30 customers that buy something

Question

Sally estimated that her call would take 21 minutes but it actually took 15  minutes. What was her percent of error?

a] 21%
b] 28.6%
c] 33.3%
d]40%

2]  Casey performs a survey to determine what students think about the sale offers in her store. Which is an unbiased representative sample of the population?

a] every tenth customer that does not buy   something 
 b] the first 30 customers that do buy something
 c] every twentieth customer that enters the store
 d] the first 30 customers that buy something

anonymous · Answer

The percentage error for the first one will be given by:
((15-21)/(21))*100

anonymous · Answer

For question 1$$percent error = (\left| hypothetical - actual \right|/ actual) * 100$$

anonymous · Answer

What progress have you made on the first question by yourself?

anonymous · Answer

For question 2
We want to think about each choice presented and identify one that illustrates no bias for or against the sale.  Which option seems to illustrate no preference for or against the sale?

anonymous · Answer

$$](21-15)/15]*100$$
$$(6/15)*100$$