I use MacOS High Sierra, but my Android Studio emulator does not work. It's Android Studio Emulator HAXM. Why it does not work? How can I make it work on my system? Does this system support the emulator?

When I tried to build my project it failed. The error came “peer not authenticated”. I tried to resync the project but the error remains same. What is this error? Is it a gradle sync error or SDK manager error and how can I deal with it?

In data analysis, all our prediction depends on the data we collected. What if there is a bias while collecting data. Unknowingly we may have collected false equivalence data which may result in the wrong conclusion at the end. It may lead to customer dissatisfaction and heavy losses in the future. So it is very crucial to remove bias from data.

For increasing technology and data, it is a crucial part for companies to invest their money and also to take the right decisions for their future development. It should also have an idea of its rivals statistics for their better performance. Can we decide which step is more feasible by analyzing previous data?

Now a day's data of a person in the wrong hands may ruin their life. So protecting the data with industries is also an important task. As the data is in the cloud, the encryption of data may decrease its performance. Due to this, most of the companies ignore their security to the end of the application. Can we secure our data without harming its performance?

Now a day's big data science is the easiest way for industries to collect their data in an organized manner with descriptive statistics. But big data is not 100% accurate and can't match data in different formats allowing the duplication of data and retarding the quality of data thereby. So how can we improve the quality of our data?

We have been using a relational database for years.  Can we use the data in this database for any new project? Can we access this database easily? How can we make the available data more efficient and analyze it faster than in the relational model? Can we use any other way to store our data?

Explain briefly the various types of blockchain architecture and its components. Mention which type is more efficient and useful in terms of usability?

Briefly explain the structure of a blockchain and the main components in it and also briefly explain how the blocks are connected in a blockchain?

Explain the working of blockchain in a clear and concise format stating the whole procedure in a series of steps which are in sequence.