5.6. Quiz App Projects Loops with Lists

This lesson reinforces the use of if/else statements and lists to keep accurate score in the Quiz app and introduces loops with lists by adding a search function which also uses a procedure with a parameter. Students are also given an opportunity to express their creativity by creating their own version of a quiz app on a different topic, and by adding an enhancement of their choosing to the app. The AP CSP pseudocode for lists is also reviewed.

CSP Framework
Big Idea 3: Algorithms and Programming (AAP)
Enduring Understanding AAP-2: The way statements are sequenced and combined in a program determines the computed result. Programs incorporate iteration and selection constructs to represent repetition and make decisions to handle varied input values.
Learning Objective AAP-2.N.a: For list operations: a. Write expressions that use list indexing and list procedures. Learning Objective AAP-2.N.b: For list operations: b. Evaluate expressions that use list indexing and list procedures.
Skill 4.B AAP-2.N.1 AAP-2.N.2 Essential Knowledge AAP-2.N.1: The exam reference sheet provides basic operations on lists, including: - accessing an element by index o   aList[i] accesses the element of aList at index i. The first element of aList is at index 1 and accessed using the notation aList[1]. - assigning a value of an element of a list to a variable o   x ← aList [i] assigns the value of aList[i] to the variable x. - assigning a value to an element of a list o   aList[i] ← x assigns the value of x to aList[i]. o   aList[i] ← aList[j] assigns the value of aList[j] to aList[i]. - inserting elements at a given index o   INSERT(aList, i, value) shifts to the right any values in aList at indices greater than or equal to i. The length of the list is increased by 1, and value is placed at index i in aList. -adding elements to the end of the list o   APPEND(aList, value) increases the length of aList by 1, and value is placed at the end of aList. - removing elements o   REMOVE(aList, i) removes the item at index i in aList and shifts to the left any values at indices greater than i. The length of aList is decreased by 1. - determining the length of a list o   LENGTH(aList) evaluates to the number of elements currently in aList. Essential Knowledge AAP-2.N.2: List procedures are implemented in accordance with the syntax rules of the programming language.
Learning Objective AAP-2.O.a: For algorithms involving elements of a list: a. Write iteration statements to traverse a list. Learning Objective AAP-2.O.b: For algorithms involving elements of a list: b. Determine the result of an algorithm that includes list traversals.
Skill 4.B AAP-2.O.1 AAP-2.O.2 AAP-2.O.3 AAP-2.O.4 Essential Knowledge AAP-2.O.1: Traversing a list can be a complete traversal, where all elements in the list are accessed, or a partial traversal, where only a portion of elements are accessed. EXCLUSION STATEMENT (EK AAP-2.O.1): Traversing multiple lists at the same time using the same index for both (parallel traversals) is outside the scope of this course and the AP Exam. Essential Knowledge AAP-2.O.2: Iteration statements can be used to traverse a list. Essential Knowledge AAP-2.O.3: The exam reference sheet provides FOR EACH item IN aList { } The variable item is assigned the value of each element of aList sequentially, in order, from the first element to the last element. The code in block of statements is executed once for each assignment of item. Essential Knowledge AAP-2.O.4: Knowledge of existing algorithms that use iteration can help in constructing new algorithms. Some examples of existing algorithms that are often used with lists include: - determining a minimum or maximum value in a list - computing a sum or average of a list of numbers

Professional Development

The Student Lesson: Complete the activities for Mobile CSP Unit 5: Lesson 5.6 Quiz App Projects.

Materials

• Presentation system (LCD projector/Interactive whiteboard)
• Access to computer, laptop, or Chromebook (install the Companion app on Chromebooks)
• Access to mobile device with the Companion app installed or access to the emulator installed on the computer or laptop. 
• Loops with Lists Video
• Loops with Lists Slides

5.6.1. Learning Activities

Estimated Length: 90 minutes

• Hook/Motivation (10 minutes): The previous lesson focused on using a ListPicker component and creating lists to manage data. Recall with an elbow partner how you designed your app to manage the question and answer data in the Quiz tutorial. What component did you use and how did you represent the questions and answers in this lab? What are some possible enhancements you could do?
• Experiences and Explorations (25 minutes): Show the intro and loops with lists videos or present the information using the slides. Direct students to the Quiz App Mini Projects. Students work in pairs to complete the mini projects on their own.
  • For mini project #1, keeping score accurately, you could demonstrate how the app can be "hacked" to earn higher scores if you only add a score variable without keeping track of whether a question has already been answered. (Hint: Answer any question correctly then click the Answer button repeatedly.)
  • For mini project #2, talk about how a loop can be used to iterate through a list.
  • As they work on their own quiz and enchancement (mini project #3), students should share and test their quizzes with each other to get feedback.
• Rethink, Reflect and/or Revise (10 minutes): Students make a new entry in their portfolios where they describe the modifications and enhancements that they made to the Quiz app. Also, ask the students to reflect on their programming experience. Discuss the the solutions to the mini projects as a class, especially the use of a list and the algorithm for keeping score and the loop for a search. Students should check their understanding by completing the interactive exercises. Any unfinished work should be completed as homework.

AP Classroom

The College Board's AP Classroom provides a question bank and Topic Questions. You may create a formative assessment quiz in AP Classroom, assign the quiz (a set of questions), and then review the results in class to identify and address any student misunderstandings.The following are suggested topic questions that you could assign once students have completed this lesson.

Suggested Topic Questions:

• Topic 3.10 Lists

Assessment Opportunities and Solutions

Solutions Note: Solutions are only available to verified educators who have joined the Teaching Mobile CSP Google group/forum in Unit 1.

• Quiz App Projects Solutions
• Quiz App aia file

You can examine students’ work on the interactive exercise and their reflection portfolio entries to assess their progress on the following learning objectives. If students are able to do what is listed there, they are ready to move on to the next lesson.

• Interactive Exercises:
• Portfolio Reflections:
  LO X.X.X - Students should be able to ...
• In the Quiz App Projects app, look for: use of a loop with lists
  #1 Keeping Accurate Score - students should create a list the same size as the number of questions with each value set to false. When a correct answer is given, the corresponding spot in the list is then changed to true. The scoring algorithm should be updated so that it only increments the score if the initial value was false.
  #2 Search - search of NASA brings up the right question. A loop is used.
  #3 New Quiz - students should create a new quiz but with different questions, images, and answers. Algorithms should remain the same, but the media and question and answer lists content will be different.

Differentiation: More Practice

If students are struggling with lesson concepts, have them review the following resources:

• Incrementing a value - note that this is with a property, but students should be using a variable
• AI2 Documentation on Lists

Differentiation: Enrichment

Students could take a look at other quiz apps in the Play store and brainstorm other enhancements to the quizzes that they could then implement.

Background Knowledge: Lists

• AI2 Documentation on Lists

5.6.2. Professional Development Reflection

Discuss the following questions with other teachers in your professional development program.

I am confident I can teach this lesson to my students.
• 1. Strongly Agree
• 2. Agree
• 3. Neutral
• 4. Disagree
• 5. Strongly Disagree