# Question

a. What is a stratified random sample?

b. What are the benefits of stratification?

c. When is stratification most likely to be helpful?

b. What are the benefits of stratification?

c. When is stratification most likely to be helpful?

## Answer to relevant Questions

a. What is a systematic sample? b. What are the main problems with systematic samples? c. Why is there no reliable standard error available for use with a sample average computed from a systematic sample? a. What is an estimator? b. What is an estimate? c. A sample standard deviation is found to be 13.8. Is this number an estimator or an estimate of the population standard deviation? d. What is the error of estimation? When ...A typical incoming telephone call to your catalog sales force results in a mean order of $28.63 with a standard deviation of $13.91. You may assume that orders are received independently of one another. a. Based only on this ...The sample average age is 69.8 and the sample standard deviation is 9.2, based on a sample of 200 individuals in a retirement community. Your friend claims that “the sample average is approximately 9.2 away from the ...You have chosen a sample of 25 supermarkets out of the 684 you have responsibility for. These 25 have been inspected, and the number of violations of company policy has been recorded. For each of the following quantities, ...Post your question

0