Explain why each of the following studies may fail to yield the desired information. (a) To determine the average annual income of its graduates 10 years after graduation, the alumni office of a university sent questionnaires in 2015 to all members of the class of 2005. (b) To study the spending patterns of individuals, a survey is conducted during first three weeks of December.

the following studies may fail to yield the desired information because

(a) i. some of the students might have died before 2015.

ii. Some people might lie based on the questionnaire sent.

So based on the two factors above the desired information might be altered or incorrect.

(b) i. individuals may be unwilling to provide accurate answers during the survey.

Step-by-step explanation:

Information may be altered when individuals are asked about their income or spending in other to show off to friends or the person asking the questions.