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Alok K.
Tutor for 3 years, previously a software developer, now a financial analyst
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R Programming
TutorMe
Question:

What is the difference between data frame and a matrix in R?

Alok K.
Answer:

Data frame contains heterogeneous inputs while a matrix does not. In a matrix only similar data types can be stored whereas in a data frame there can be different data types like characters, integers or other data frames.

HTML5 Programming
TutorMe
Question:

What happens if you open the external CSS file in a browser?

Alok K.
Answer:

If you try to open the external CSS file in a browser, the browser cannot open the file, because the file has a different extension. The only way to use an external CSS file is to reference it using <link/> tag within another html document.

Statistics
TutorMe
Question:

To ensure quality, customer calls for airline fare quotations are monitored at random. On a particular afternoon, ticket agent bob gives 40 fare quotations out of which four are incorrect. In a random sample of 8 of these customer calls. Which model best describes the number of incorrect quotations Bob will make?

Alok K.
Answer:

Binomial distributions are characterized by two parameters: success and failures. n, which is fixed - this could be the number of trials or the total sample size if we think in terms of sampling, and π, which usually denotes a probability of success. Hence, in this scenario binomial distribution is the best choice.

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