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NEW QUESTION 22
A Data Scientist uses logistic regression to build a fraud detection model. While the model accuracy is 99%, 90% of the fraud cases are not detected by the model.
What action will definitively help the model detect more than 10% of fraud cases?

A. Using undersampling to balance the datasetB. Using oversampling to balance the datasetC. Using regularization to reduce overfittingD. Decreasing the class probability threshold

Answer: D

Explanation:
Decreasing the class probability threshold makes the model more sensitive and, therefore, marks more cases as the positive class, which is fraud in this case. This will increase the likelihood of fraud detection. However, it comes at the price of lowering precision.

 

NEW QUESTION 23
Amazon Connect has recently been tolled out across a company as a contact call center The solution has been configured to store voice call recordings on Amazon S3 The content of the voice calls are being analyzed for the incidents being discussed by the call operators Amazon Transcribe is being used to convert the audio to text, and the output is stored on Amazon S3 Which approach will provide the information required for further analysis?

A. Use Amazon Translate with the transcribed files to train and build a model for the key topicsB. Use Amazon Comprehend with the transcribed files to build the key topicsC. Use the AWS Deep Learning AMI with Gluon Semantic Segmentation on the transcribed files to train and build a model for the key topicsD. Use the Amazon SageMaker k-Nearest-Neighbors (kNN) algorithm on the transcribed files to generate a word embeddings dictionary for the key topics

Answer: A

 

NEW QUESTION 24
A Machine Learning Specialist is assigned to a Fraud Detection team and must tune an XGBoost model, which is working appropriately for test dat a. However, with unknown data, it is not working as expected. The existing parameters are provided as follows.

Which parameter tuning guidelines should the Specialist follow to avoid overfitting?

A. Lower the min_child_weight parameter value.B. Increase the max_depth parameter value.C. Lower the max_depth parameter value.D. Update the objective to binary:logistic.

Answer: C

 

NEW QUESTION 25
An agency collects census information within a country to determine healthcare and social program needs by province and city. The census form collects responses for approximately 500 questions from each citizen.
Which combination of algorithms would provide the appropriate insights? (Select TWO.)

A. The Random Cut Forest (RCF) algorithmB. The k-means algorithmC. The principal component analysis (PCA) algorithmD. The factorization machines (FM) algorithmE. The Latent Dirichlet Allocation (LDA) algorithm

Answer: B,C

Explanation:
The PCA and K-means algorithms are useful in collection of data using census form.

 

NEW QUESTION 26
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