Probability and statistics

(I need it in 50 min)

1. Refers to a figure that represents the entire population.

a) Point estimate

b) Percentiles

c) Interval estimation

1. Customers of the company Alerce Austral have the option of paying for their purchases at a normal cash register, operated by a cashier (traditional method), or using a scanner to make their payments. The sales manager wants to know if the average payment time with the traditional method is less than the average payment time with the scanner, so he gathered the following information (table 1):

Tipo de Sample Mean Standard cliente deviation 1 Sample size Tradicional 4.50 0.30 50 Escaner 4.30 0.20 100