Statistics 2

Question 1

Define confidence interval

Answer 1

Range of possible values for a given data set (eg. if a mean of 150k has a margin of error of 10k, the confidence margin is 140k to 160k)

Question 2

Most ideal data set

Answer 2

the most diverse data while still staying true to the data subject

Question 3

Factors that impact the margin of error

Answer 3

1. Sample size

2. Variability in data (standard deviation from best fit line)

Question 4

Given a certain value and how many times it occurs in dataset y. Determine how many times it occurs in a bigger dataset

Answer 4

Amount of values in bigger dataset*(# of times a certain value occurs in dataset y/total # of values)

Question 5

As activity x increases, the frequency of event y does too, can it be concluded that the doing activity x can result in event y?

Answer 5

No, association ≠ causation

be alert of this in SAT

Question 6

Define random assignment

Answer 6

Taking a random # of samples and randomly assigning it an activity/influence in order to add ‘control’ to an experiment

Question 7

Translate the confidence level of a given range

Answer 7

The likelihood of a statistical measure of a range being a value or between two values