Data Science at BFH - Bern University Of Applied Sciences | Flashcards & Summaries

# Lernmaterialien für Data Science an der BFH - Bern University of Applied Sciences

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The accuracy metric is best suited when ...

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there are many classes

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Which of the following is not a reason why data science technologies are attracting significant attention nowadays?

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Data are difficult to transfer from databases

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Finding the most profitable customer is an example of an unsupervised learning task.

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False

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Which statement about Bagging is NOT true:

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the rows of the dataset are sampled

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Which of these organizations would have the most challenge in applying supervised learning?

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A grocery store that is trying to identify which of its loyalty-card-carrying customers will spend more than \$100 next month

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Hyperparamters...

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Which of the following would you choose when deciding on a measure of central tendency for a data set that contains outliers?

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Median

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The residuals are...

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... a measure of how close the targets are to their median value

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Suppose we have trained a Decision Tree on a dataset D. Consider the split learned at the root of the tree. Which of the following is true if one of the datapoints in D is removed and we re-train the tree?

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The split at the root will be different

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Complete the sentence: The Pearson correlation coefficient ranges from ...

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-1 to 1 and describes the linear correlation between two variables

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Which statement is NOT true about feature importance in Random Forests:

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it is measured by looking at the features give an advantage in the decision tree splits

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You are building a medical test for a virus. Which metric is probably most important:

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RMSE

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Q:

The accuracy metric is best suited when ...

A:

there are many classes

Q:

Which of the following is not a reason why data science technologies are attracting significant attention nowadays?

A:

Data are difficult to transfer from databases

Q:

Finding the most profitable customer is an example of an unsupervised learning task.

A:

False

Q:

Which statement about Bagging is NOT true:

A:

the rows of the dataset are sampled

Q:

Which of these organizations would have the most challenge in applying supervised learning?

A:

A grocery store that is trying to identify which of its loyalty-card-carrying customers will spend more than \$100 next month

Q:

Hyperparamters...

A:

Q:

Which of the following would you choose when deciding on a measure of central tendency for a data set that contains outliers?

A:

Median

Q:

The residuals are...

A:

... a measure of how close the targets are to their median value

Q:

Suppose we have trained a Decision Tree on a dataset D. Consider the split learned at the root of the tree. Which of the following is true if one of the datapoints in D is removed and we re-train the tree?

A:

The split at the root will be different

Q:

Complete the sentence: The Pearson correlation coefficient ranges from ...

A:

-1 to 1 and describes the linear correlation between two variables

Q:

Which statement is NOT true about feature importance in Random Forests:

A:

it is measured by looking at the features give an advantage in the decision tree splits

Q:

You are building a medical test for a virus. Which metric is probably most important:

A:

RMSE

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