### All Weeks Input and Interaction Coursera Quiz Answers

In this course, you will learn relevant fundamentals of human motor performance, perception, and cognition that inform effective interaction design. You will use these models of how people work to design more effective input and interaction techniques. You’ll apply these to both traditional graphic and gestural interfaces.

### Input and Interaction Coursera Quiz Answers

#### Week 1: Fitts’ Law

Q1. In this quiz, you will use Fitts’ law to calculate the expected motor movement time for several different situations and interfaces. For all of the questions below, the Fitts’ law formulation to use is: t = a + b·log2(d/w). For the fixed cost portion a, use 0.8 seconds. Do not include measurement labels with answer; just the number will suffice. You may find this link helpful for logarithms.

Scenario 1

Imagine, you’ve been doing some very important scholarly research, on a library computer with a mouse. For the control rate b of the mouse use 0.204 s/b (the reciprocal of 4.9 b/s). Having found the necessary information, you’ll next close the window by clicking the red jellybean in the top left of the screen. Your mouse is 935 pixels from the target and the target is 12 pixels wide. How long is the motor movement expected to take?

Give your answer to 2 decimal places (e.g. 9.81) and use a dot “.” to separate the decimal number.

Enter answer here

Q2. The Fitts’ law formulation to use is: t = a + b·log2(d/w). For the fixed cost portion a, use 0.8 seconds. For the control rate b of the mouse use 0.204 s/b (the reciprocal of 4.9 b/s).

So that spies can’t steal your secret sources, you decide to clear your browser cache. This comprises two mouse motions. The first must traverse 67 pixels, to reach a target w of 22 pixels. How long is the motor movement expected to take?

Give your answer to 2 decimal places (e.g. 9.81) and use a dot “.” to separate the decimal numbers.

Enter answer here

Q3. The Fitts’ law formulation to use is: t = a + b·log2(d/w). For the fixed cost portion a, use 0.8 seconds. For the control rate b of the mouse use 0.204 s/b (the reciprocal of 4.9 b/s).

The second must traverse 105 pixels; the “Clear History and Website Data” menu item is 20 pixels high. A note on these w values: As an approximation, we’re using the width of the target when travelling mostly horizontally and the height of the target when travelling mostly vertically.

Give your answer to 2 decimal places (e.g. 9.81) and use a dot “.” to separate the decimal numbers.

Enter answer here

Q4.Proud of your research, you decide it’s time to go surfing! You go home and check out surf conditions on your laptop, which has a touchpad input. Unfortunately, this week’s surf is not looking so good at Blacks.

What is the expected movement time to click the 7-12 button to see if next week will be better?

Use 0.345 s/b for the touchpad’s b value (1/2.9 b/s). The cursor’s starting (x,y) coordinate is (823, 41) The target’s center is (675, 312) and its width is 30 pixels. Calculate the distance to two decimal points and plug into the Fitts’ law equation to find the expected movement time.

Give your answer to 2 decimal places (e.g. 9.81) and use a dot “.” to separate the decimal numbers.

Enter answer here

#### Week 3: Cumulative Quiz

Q1. You and a friend are searching for a movie to watch this evening. If you satisficed, you would:

- Find that perfect movie
- Find something that both of you are reasonably happy with in a relatively short amount of time
- Watch Hot Tub Time Machine 2
- Pick a movie that your friend liked even if you aren’t that happy with it.

Q2. Fitts’ law movement time estimates are dependent on 4 parameters: a, b, d, and w. Which ones are user dependent? Check all that apply:

- w
- a
- b
- d

Q3. When comparing a radial and linear menu, the following statement is true:

- The radial menu is faster than the linear menu because of both target size and distance.
- The radial menu is faster than the linear menu because of distance
- The linear menu is faster than the radial menu because of target size
- The linear menu is faster than the radial menu because of distance

Q4. This question refers to the following scenario:

You are designing a row of buttons for a new mouse-based user interface shown below. Your goal is to minimize the time it takes to reach the buttons from the center of the screen. You look at your old IS306 notes, and you think that Fitts’s law can help you make sense of this situation.

Fitts’s law models movement time (MT) with this formula:

MT = a + b log2 (D/W + 1)

For variable b in the equation, which of the following best expresses what the variable refers to.

- The y-axis intercept of the model
- The spacing between the screen center and a button
- The size of the a button on the screen
- The speed of the user’s mouse

Q5. This question refers to the following scenario:

You are designing a row of buttons for a new mouse-based user interface shown below. Your goal is to minimize the time it takes to reach the buttons from the center of the screen. You look at your old IS306 notes, and you think that Fitts’s law can help you make sense of this situation.

Fitts’s law models movement time (MT) with this formula:

MT = a + b log2 (D/W + 1)

Which of the following (A, B, and C) takes the shortest amount of time to reach the buttons from the center of the screen?

- Circle B takes the shortest time.
- Both circles B and C take the shortest time.
- Both circles A and B take the shortest time.
- Circle A takes the shortest time.

Q6. This question refers to the previous scenario:

You are designing a row of buttons for a new mouse-based user interface shown below. Your goal is to minimize the time it takes to reach the buttons from the center of the screen. You look at your old IS306 notes, and you think that Fitts’s law can help you make sense of this situation.

Your company decides to implement an iPad version of your system, and you are re-thinking the design of the interface for touch input. Which of the following design changes is likely to improve the usability of these buttons in a touch-based interface?

- Arrange the buttons in a column (vertically), rather than a row (horizontally)
- Provide tool tips when the user hovers over a button.
- All of the above
- Increase the size of the buttons.
- None of the above

Q7. In a row/column scanning keyboard, what must be true? Check all that apply.

- The number of rows times the number of columns is at least as large as the number of keys
- The number of rows plus the number of columns is at least as large as the number of keys
- When pressing a key, the circuit is closed both for the row and a column
- When pressing a key, the circuit is closed for a row if lowercase and a column if uppercase

Q8. A standard optical rotary encoder (commonly found in mice and jog dials) infers movement direction by:

- Using the sequence from two low-high hole patterns
- Centripetal force
- An accelerometer
- Computing the doppler shift of the mouse’s squeak

Q9. A faceted search interface:

- lets the user filter results based on distinct attributes
- uses a grid system to layout search results
- provides a snippet summary of each result
- shows search results with a depth perspective so that the next result is behind the first

Q10. Showing variations aids creativity because (check all that apply):

- Can make it faster to select the desired outcome.
- Like a good visualization, leverages our high-bandwidth visual perceptual system
- Lets people see things they might not have thought of
- It leverages recognition over recall

Q11. In Guiard’s kinematic-chain theory of bimanual input, the non-dominant hand (check all that apply):

- Sets the frame
- Acts first
- Performs the coarse motor movements
- Performs fine motor movements

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