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S5 Accuracy All Sections. Security Today’s Topic Information Quality IS Basics E-commerce...
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Transcript of S5 Accuracy All Sections. Security Today’s Topic Information Quality IS Basics E-commerce...
Accuracy
S5 AccuracyAll Sections
Security
Today’s Topic
Information Quality
IS Basics
E-commerce
AccessExcel
PowerPoint
Types of IS
Systems Development
Database Processing & Design
Spreadsheet Design
Business Intelligence
Functional, Crossfunctional & Interorganizational
Telecommu-nications
Hardware & Software
Accuracy & Efficiency
Clarity
Simplicity
SpreadsheetDesign
includes
Accuracy
Verifiability
Efficiency
Basic FormattingConditional Formatting
Freeze PanesPage Setup
SortingCharts
Layout Choices
DocumentationData Validation
Protection
FormulasFunctions
FormulasFunctionsMacros
implemented with
Define the accuracy goal.
Apply the spreadsheet design goal of accuracy.
Objectives
SUM Function AVERAGE Function MIN & MAX Functions COUNT Function 3D Calculations
Required Excel Skills Range Name Change Legend Change Axis Add Data Series ‘Other’ Pie Slice
Know the order of operations.
Select the correct function or construct the correct formula. (Choose a function over a formula.)
Isolate assumptions.
Check relative and absolute cell references.
Double-check all calculations.
What Steps Should You Follow to Improve Accuracy?
Parentheses
Multiplication and Division
Addition and Subtraction
What is the Order of Operations?
1. 6 / 2 * 4 =
2. 3 + 2 * 2 – 1 =
3. ( 2 * 5 ) + 15 / 5 =
Order of Operations Examples
Formula ◦ created by you◦ = A1 + A10
Function ◦ keyword defined by Microsoft◦ =SUM(A1:D1)◦ Functions are more flexible than formulas
What’s the Difference Between Formula and Function?
Formula vs. Function Example
=B3+B4+B5+B6
=SUM(C3:C6)
If you delete Row 5=SUM(C3:C5)
=cell reference
Used to transfer data from one cell to another
Benefit over copy & paste: redundant location is dynamic
What is the Simplest Formula?
SUM
AVERAGE
MIN and MAX
COUNT
What are the Common Functions?
Common Functions Examples
Store numbers in cells
Write equations to point to cells containing numbers
What Does Isolate Assumptions Mean?
Isolate Assumption Example
Assumption
=E2+3 is incorrect=E2+H2 is correct
Isolated Assumptions?How Do You Spend Your Study Time?
How Do You Spend Your Day?
Isolated Assumptions?
Cell Address Reference Changes when Copied
A1 Relative Vertically or Horizontally
$A$1 Absolute Never
$A1 Mixed Vertically
A$1 Mixed Horizontally
What are Relative, Absolute & Mixed Cell References?
The cell addresses in the copied calculation may change.
Any changes are made according to the direction and distance of the destination cell from the original source cell.
Is the formula entered going to be copied?
If so, which direction?
If it’s copied vertically, do you want the row references to change? If it’s copied horizontally, do you want the column references to change?
Do you want such a change to take place?
What are the Decision Points for Choosing the Correct Cell Reference?
What are the Decision Points for Choosing the Correct Cell Reference?
CopyFormula?
Vertical orHorizontal?
ChangeRows?
ChangeColumns?
Yes
No Stop
HorizontalVertical
YesYes
Stop
No
Enter $ beforecolumn letters
that shouldnot change
No
Enter $ beforerow numbers that shouldnot change
Start
1. Will you copy this function?2. If so, which direction: vertical or horizontal?3. If you copy vertically, Excel will automatically
change all relative row references. Do you want those row references to change?
Relative/Absolute Example
=SUM(B2:D2)
Mixed Cell References Needed?
How Do You Spend Your Study Time?
What equations would you use to calculate◦ Weighted Credits for each course◦ Total Semester Credits◦ Total Semester Weight Credits◦ GPA
Remember to:◦ Choose a function over a formula◦ Isolate assumptions◦ Check relative and absolute cell references
GPA Accuracy Activity
GPA Accuracy Activity
IF function displays one of two possible values depending on the outcome of a logical test
Logical Test compares two things
If the Logical Test equates to TRUE, the cell is filled with the True Value.
If the Logical Test equates to FALSE, the cell is filled with the False Value.
What is the Purpose of the IF Function?
If a course requires more than 3 hours of study time per week, we will label it HARD. Three or less hours of study is labeled EASY.
IF Label Example
What cell is used for the logical test? What is the logical test? What is the true value? False value?
IF Label Example
3
IF Grade Example
Use the IF function to assign Pass/Fail grades.
=IF(V4>=.6,”P”,”F”)