Question

7. The number of customers per 30 minutes visiting to the restaurant from 8am to 10pm in a particular day are shown as below. Suppose 0900 is the starting time and the number of customers in every 3-hour are selected to form a sample.
Starting from 0800 0830 0900 0930 1000 1030 1100 1130 1200 1230 1300 1330 1400 1430
No. of customers 10 30 20 30 31 35 23 25 23 29 36 27 28 31
Starting from 1500 1530 1600 1630 1700 1730 1800 1830 1900 1930 2000 2030 2100 2130
No. of customers 17 27 25 29 21 35 24 29 39 39 40 35 16 6
(a) Which times are selected in the sample?
(b) What is the sampling method used?
(c) What is the average number of customers based on the times selected in the sample?

Answer 1

Step-by-step explanation:

a) Following times are included in sample

0900 1200 1500 1800 2100

b) Selective sampling or discrete sampling technique is used. It is because a sample is collected or considered after a specific or defined time interval and that remain constant throughout the period

c) Total number of customer are ( 20 + 23 + 17 + 24 + 16) = 100

Total number of times samples = 5

Average number of customers = 100 / 5 = 20