Asource for conducting formal research would include a. observations b. interviews c. written reports d. personal ideas

written reports

Explanation:

A source for conducting formal research would include written reports. Written reports serve as secondary sources of data and information that may be relevant when conducting formal research. They may include;

Government census, magazines, newspapers, textbooks, journals and many other documented information.

Observations, interviews and personal ideas will constitute primary sources of data.

d) social security number

let me know if i am correct or not, so i can edit the answer.

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