Code.org Unit 4 Review

This type of encryption uses one key for both encryption and decryption.

• symmetric

• asymmetric

• private

• public

If your message is encrypted using public key encryption it is _________________ to crack.

• impossible

• relatively easy

• computationally hard

• relatively hard

The key for a random substitution cipher is 

• a number
• an alphanumeric string
• a mapping of the letters of the alphabet to other letters
• two keys, a public and a private

Historically it has been observed that computer processing speeds tend to double every two years. This is known as:

• Boolean's Conjecture
• Moore's Law
• The "Big Data" Effect
• Powers of 2 Principle

When a computer scientist uses the term "Big Data" what do they typically mean?

• That a data set is larger than 5TB, which is the common "Big Data" threshold. 
• There is enough data that traditional data processing applications are inadequate. 
• It implies that the findings from the data analysis are hugely important for society. 
• There is so much data that it is virtually impossible to process. 

Which of the following is the best explanation for the concept of "The cost of free"?

• Apps and websites that collect and track data about you in exchange for providing you a service free of cost.

• You receiving coupons for stores you frequently shop at.

• Receiving emails from an online store that you always buy items from.

• Apps and websites that collect and track data about you in exchange for providing you a service that you must pay for.

What can be found in our browsers that keeps a record of our movements on the Internet?

• Hackers
• Virus
• Cookies
• Phishing scam

A broad term for datasets so large or complex that traditional data processing applications are inadequate.

• Moore's law

• Big data

• Exponential Growth

• Data analysis

According to Moore's Law, the world will produce as much data in the next _______ years as currently existed in all of humanity prior to that:

• Two

• Three

• Five

• Six

Above is an image from Google Trends that plots Cats and Dogs.

Which of the following is NOT a reasonable conclusion you can come up with looking at this chart?

• The sharp spike in dogs trends could be due to an increase in dog attack stories during that year

• This chart proves that people love dogs more than they do cats

• People search for dogs more than they do cats

• It's possible there were more funny dog videos than cat videos during this period of time