The utility company in the city of Harperville serves 20,000 residential addresses. The company wants to gauge interest in a “Beat the Peak” program which offers consumers a discount in exchange for limited electricity usage during peak hours. Unknown to the utility company, 18% of its 20,000 residential customers would participate in such a program. Since the company does not know the level of interest among its customers, the company selects every 40th account from an alphabetical listing of residential account holders, starting with the 23rd name. Of the 500 subscribers selected, 16% express interest in the “Beat the Peak” program. 1a) What type of sampling did the utility company employ? A. simple random sample B. systematic C. cluster D. stratified E. Voluntary response
Unitary Method
The word “unitary” comes from the word “unit”, which means a single and complete entity. In this method, we find the value of a unit product from the given number of products, and then we solve for the other number of products.
Speed, Time, and Distance
Imagine you and 3 of your friends are planning to go to the playground at 6 in the evening. Your house is one mile away from the playground and one of your friends named Jim must start at 5 pm to reach the playground by walk. The other two friends are 3 miles away.
Profit and Loss
The amount earned or lost on the sale of one or more items is referred to as the profit or loss on that item.
Units and Measurements
Measurements and comparisons are the foundation of science and engineering. We, therefore, need rules that tell us how things are measured and compared. For these measurements and comparisons, we perform certain experiments, and we will need the experiments to set up the devices.
The utility company in the city of Harperville serves 20,000 residential addresses. The company wants to gauge interest in a “Beat the Peak” program which offers consumers a discount in exchange for limited electricity usage during peak hours. Unknown to the utility company, 18% of its 20,000 residential customers would participate in such a program.
Since the company does not know the level of interest among its customers, the company selects every 40th account from an alphabetical listing of residential account holders, starting with the 23rd name. Of the 500 subscribers selected, 16% express interest in the “Beat the Peak” program.
1a) What type of sampling did the utility company employ?
A. simple random sample
B. systematic
C. cluster
D. stratified
E. Voluntary response
F. Convenience
G. Judgement
2b) The utility company divides its service area into 5 zones. If the company had randomly selected 100 customers from each zone, which type of sampling would they have employed?
A. simple random sample
B. systematic
C. cluster
D. stratified
E. Voluntary response
F. Convenience
G. Judgement
1c) If the company had randomly selected 500 addresses from all residual addresses, which type of sampling would they have employed?
A. simple random sample
B. systematic
C. cluster
D. stratified
E. Voluntary response
F. Convenience
G. Judgement
1d) If the company had randomly selected 50 neighborhoods within its service area and solicited opinions from every customer in those neighborhoods, which type of sampling would they have employed?
A. simple random sample
B. systematic
C. cluster
D. stratified
E. Voluntary response
F. Convenience
G. Judgement
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