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Top 8 skills required to become Data Analyst

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2- SQL
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8- Problem solving

Interview Question

Define F-test. Where would you use it?

An F-test is any statistical hypothesis test where the test statistic follows an F-
distribution under the null hypothesis. If you have 2 models that have been fitted to
a dataset, you can use F-test to identify the model which best fits the sample
population.

Interview Question

Define Sampling. Why do we need it?

Sampling is a process of choosing a subset from a target population which would
serve as its representative. We use the data from the sample to understand the
pattern in the population as a whole. Sampling is necessary because often we can
not gather or process the complete data within a reasonable time. There are many
ways to perform sampling. Some of the most commonly used techniques are
Random Sampling, Stratified Sampling, and Clustering Sampling.

Interview Question

Define Confidence interval.

A confidence interval is an interval estimate which is likely to include an
unknown population parameter, the estimated range being calculated from the
given sample dataset. It simply means the range of values for which you are
completely sure that the true value of your variable would lie in.

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