Explain the merits and demerits of the Enumeration Method for primary data collection.

Adekunle is investigating the number of emails people receive at work.

He makes the prediction: People get more emails on Mondays than on Fridays.

How can Adekunle collect data to test his predication?

The shortcoming of this indirect method is genuineness and accuracy of the information, as it completely depends on the third party.

The information collected through Personal Contact Direct method is normally more accurate because interviewer can clear doubts of the informants about certain questions and thus obtain correct information.

A company investigates the success of a telephone helpline.

A survey of callers using the telephone helpline are asked the question:

Was the service you received helpful? Please circle one number.

What is an advantage of asking the question in this way?

In which method of primary data collection, the information is collected by interviewing the third party who knows the respondent well?

A teacher asks learners to estimate the number of sweets in a jar. She makes two predictions:

• The estimates of the boys will be too big.
• The estimates of the girls will be too small.

How can she collect the data?

Represent the union of two sets by Venn diagram for each of the following.

$X=\{x | x$ is a prime number between $80$ and $100\}$

$Y=\{y | y$ is an odd number between $90$ and $100\}$

Here is a question from a questionnaire.The questionnaire is given to people who stayed at a hotel.

How clean was your room? Circle one number.  $1 2 3 4 5$ 

What is missing from the question?