Author Question: The sample variance is approximately the average of the squared deviations of the measurements from ... (Read 83 times)

burchfield96 · **on:** Jul 24, 2018

The sample variance is approximately the average of the squared deviations of the measurements from their mean.
Indicate whether the statement is true or false

Question 2

A large shipment of TV sets is accepted upon delivery if an inspection of ten randomly selected TV sets yields no more than one defective TV. The binomial probability distribution is often used in situations similar to this one, namely, large populations sampled without replacement. Explain why the binomial yields a good estimate.

swimkari · **Reply #1 on:** Jul 24, 2018

Answer to Question 1

T

Answer to Question 2

Even though the P(defective) changes from trial to trial, if the population is very large, the probabilities are very similar. For example, suppose the population has 10,000 items and 50 are defective. P(defective) on the first trial is 50/10,000 = 0.0050; if after 10 trials 45 defectives have been selected, P(defective) will be 45/9990 = 0.0045.