Data Processing questions and answers

Data Processing Questions and Answers

Data Processing questions to test candidates’ acquisition of basic skills of data processing and knowledge in the application of ICT in facilitating business transactions and education.

1.

Use Table 1 to answer the following question.


Table 1: TableStudent
 

 Reg No  House

 Age

 18/001  Yellow  14
 18/002  Blue  15
 18/003  Yellow  15

The attributes in Table 1 are

 

A.

Yellow, Blue, Yellow

B.

14, 15, 15

C.

Reg. No, House, Age

D.

18/001, 18/002, 18/003

Correct answer is C

The attributes in Table 1 are Reg. No, House, and Age.

An attribute is a single piece of data about an entity. In Table 1, each row represents a student entity. The Reg. No, House, and Age columns represent the attributes of the student entity.

The values in the Reg. No column are unique, so the Reg. No column is the primary key of the table. The House and Age columns are not unique, so they cannot be used as primary keys.

The other values in the table are the data for the attributes. For example, the value "18/001" in the Reg. No column is the data for the Reg. No attribute of the first student entity.

2.

Use Table 1 to answer the following question.

Table 1: TableStudent

 Reg No  House

 Age

 18/001  Yellow  14
 18/002  Blue  15
 18/003  Yellow  15



Columns 2 and 3 in Table 1 cannot be used as primary key because both fields contain

A.

Different datatypes

B.

Duplicate values

C.

The same datatype

D.

Only strings and numbers respectively

Correct answer is B

Columns 2 and 3 in Table 1 cannot be used as a primary key because both fields contain duplicate values.

A primary key is a unique identifier for each record in a database table. It ensures that each record has a distinct value, allowing for efficient data retrieval and maintaining data integrity. In the given TableStudent, the "House" column (Column 2) and the "Age" column (Column 3) both contain duplicate values. For example, the House column has two records with the value "Yellow" and the Age column has two records with the value "15". Since a primary key must have unique values, neither of these columns can be used as the primary key.

3.

Figure 3 is a Microsoft Excel Worksheet. Use it to answer questions 20 and 21.

 

   A  B  C  D  E
 1  IDENTICATION NUMBER  BASIC SALARY (N)  TOTAL ALLOWANCE (N)  TOTAL DEDUCTION (N)

 NET SALARY (N)

 2  WASC/LPT/001  800000  60000  40000  820000
 3  WASC/LPT/002  700000  40000  20000  720000
 4  WASC/LPT/003  300000  10000  5000  305000
 5  WASC/LPT/004  400000  20000  10000  410000

 

Figure 3
What formula will calculate the total number of individuals who earn less than ₦500,000 from the table as shown in Figure 3?

A.

COUNT(E2:E5

B.

COUNT(E2:E5)

C.

COUNTA(E2:E5)

D.

COUNTIF(E2:E5

Correct answer is D

The formula that will calculate the total number of individuals who earn less than ₦500,000 from the table as shown in Figure 3 is COUNTIF(E2:E5, "< 500,000").

 

The COUNTIF function counts the number of cells that contain a specific value in a range. In this case, we want to count the number of cells in the E column that contain a value less than ₦500,000. The E column contains the net salaries of the individuals. Therefore, the COUNTIF function will return the total number of individuals who earn less than ₦500,000.

4.

Figure 3 is a Microsoft Excel Worksheet. Use it to answer questions 20 and 21.
 

   A  B  C  D  E
 1  IDENTICATION NUMBER  BASIC SALARY (N)  TOTAL ALLOWANCE (N)  TOTAL DEDUCTION (N)

 NET SALARY (N)

 2  WASC/LPT/001  800000  60000  40000  820000
 3  WASC/LPT/002  700000  40000  20000  720000
 4  WASC/LPT/003  300000  10000  5000  305000
 5  WASC/LPT/004  400000  20000  10000  410000

Figure 3

What formula will correctly display the total number of individuals involved in the computation as shown in Figure 3?

A.

COUNT(A2:A5)

B.

COUNTIF(A2:A5)

C.

COUNTA(A2:A5)

D.

SUM(A2:A5)

Correct answer is C

The formula that will correctly display the total number of individuals involved in the computation as shown in Figure 3 is COUNTA(A2:A5).

 

The COUNTA function counts the number of cells that are not empty in a range. In this case, we want to count the number of cells in the A column that are not empty. The A column contains the identification numbers of the individuals involved in the computation. Therefore, the COUNTA function will return the total number of individuals involved in the computation.

 

The other formulas mentioned are:

 

COUNT: This function counts the number of cells that contain numbers in a range.

COUNTIF: This function counts the number of cells that contain a specific value in a range.

SUM: This function sums the values in a range.

 

In this case, we do not want to count the number of cells that contain numbers or the number of cells that contain a specific value. We want to count the number of cells that are not empty. Therefore, the COUNTA function is the most appropriate function to use.

5.

S/N A B C D E F G H
1 STAFF DAYS ITEMS SALES (N) ITEMS SALES (N) ITEMS SALES (N) ITEMS SALES (N) ITEMS SALES (N)

ITEMS SALES (N)

2 JOY MON 208 300 500 400 300 158
3 AKIN TUE 300 200 500 400 200 200
4 KEN WED 400 300 400 500 100 300
                 

Figure 3

The highest sale by Joy is recorded in cell

A.

F1

B.

B4

C.

B4

D.

E2

Correct answer is D

No explanation has been provided for this answer.