Basics of Probability and Statistics Week 1 Challenge
- Why there is a difference in the formula of variance for population and sample
- To get better and unbiased estimate of the population variance.
- How many different samples can be created out of population of size n:
- nc1+nc2+nc3+...ncn
- What is the probability of drawing 2 jacks from a pack of card:
- 4c2/52c2
- What is the probability that both the numbers on dice are same while rolling 2 dice:
- 6/36
- Why standard deviation when variance can measure the dispersion in data
- standard deviation is measured in same units as mean. So easy to compare.
- Difference between stratified and clustered sampling
- In stratified: Some samples are drawn from each strata
- In clustered:All the samples are taken from any of the clusters.