Lexicon Services Interview Questions and Answers

Calculate probability of unfair coin tossed n times and do hypothesis testing

• Calculate the theoretical probability of getting heads or tails for the unfair coin

• Perform the actual coin toss n times and record the outcomes

• Use hypothesis testing to determine if the coin is unfair based on the observed outcomes

Encrypt a given string based on rows and columns defined.

• Create a 2D array with given rows and columns

• Traverse the string and fill the array row-wise

• Read the array column-wise to get the encrypted string

Bagging and boosting are ensemble learning techniques used to improve the performance of machine learning models by combining multiple weak learners.

• Bagging (Bootstrap Aggregating) involves training multiple models independently on different subsets of the training data and then combining their predictions through averaging or voting.

• Boosting involves training multiple models sequentially, where each subsequent model corrects the errors made by the previous ones. Popular boos...read more

The p value is a measure used in hypothesis testing to determine the significance of the results.

• The p value is the probability of obtaining results as extreme as the observed results, assuming the null hypothesis is true.

• A p value of less than 0.05 is typically considered statistically significant.

• A p value greater than 0.05 suggests that the results are not statistically significant.

• Researchers use p values to determine whether to reject the null hypothesis in favor of the ...read more

Java is a popular programming language, OOPs stands for Object-Oriented Programming, and multithreading is the ability of a CPU to execute multiple threads concurrently.

• Java is a high-level, class-based, object-oriented programming language known for its portability and versatility.

• OOPs is a programming paradigm based on the concept of objects, which can contain data in the form of fields and code in the form of procedures.

• Multithreading is the ability of a CPU to execute mul...read more

Handling low marketing, cash and rude customers

• For low marketing, focus on building a strong online presence and networking with potential clients

• To handle cash, keep track of expenses and revenue, and consider implementing a budget

• When dealing with rude customers, remain calm and professional, actively listen to their concerns, and offer solutions

Pyspark DataFrame is distributed and optimized for big data processing, while Pandas DataFrame is for single-machine processing.

• Pyspark DataFrame is distributed and can handle large datasets that don't fit in memory.

• Pandas DataFrame is designed for single-machine processing and is suitable for smaller datasets.

• Pyspark DataFrame supports parallel processing and can leverage distributed computing resources.

• Pandas DataFrame is more suitable for interactive data analysis and expl...read more

My 5 qualities are leadership, communication, adaptability, problem-solving, and teamwork.

• Leadership - I have experience leading teams and making tough decisions.

• Communication - I am able to effectively convey ideas and information to others.

• Adaptability - I can easily adjust to new situations and challenges.

• Problem-solving - I am skilled at analyzing problems and finding creative solutions.

• Teamwork - I work well with others and can collaborate effectively on projects.