1a) Identify the method of sampling used to collect the data in the following scenario.

A branch manager working for the Citywide Bank Corporation wanted to determine the average FICO credit score of its clients who apply for a home mortgage. The branch manager instructed a loan officer to record the FICO credit scores of every third client who applied for a home mortgage at Citywide Bank Corporation during the last month.

1b) Identify the method of sampling used to collect the data in the following scenario.

Students working on a project in their Elementary Statistics course were assigned the task of using descriptive statistics techniques to describe the length of sentences (in words) written by J. K. Rowling in her book "Harry Potter and the Sorcerer's Stone". First, the students used the random number generator function on their TI-84 calculator to randomly select 20 of the 309 page numbers in the book. Then, the students used the random number generator function again to randomly select one of the sentences that appear on each of these randomly selected pages. The number of words in the randomly selected sentences was counted and recorded.

1c) Identify the method of sampling used to collect the data in the following scenario.

University Hospital conducted a study in order to determine the blood type distribution of its patients. During each of the hospital's three laboratory work shifts (day, evening, and overnight), a random sample of fifteen patients who had blood tests performed during that shift was selected.