Exam 11: Unsupervised Data Mining

The Corner Market is using 1,750 transactions on item purchases for analysis. Based on initial results, the manager noticed eggs and potato chips were frequently in the same transactions. After calculating the confidence and the expected confidence on the data, 0.44 and 0.61 respectively, they want to run a lift ratio to ensure there is a positive association. Calculate the lift ratio and determine if the association is positive or negative.

Of 10,000 grocery store transactions, 895 have been identified as having coffee, ice cream, and chips as part of the same transaction. Calculate the support of the association rule.

In the k-Means Clustering Method, there is a general process of how k-means clustering algorithm can be classified. Which one of the following is not one of the general processes?

Eva is trying to figure out the total number of possible combinations for 50 inventory items. Calculate the number for Eva.

Using R, which function is used to conduct association rule analysis?

Under the association rule, a lift ratio between 0 and 1 indicates a positive association.

The Corner Market is using 2,500 transactions on item purchases for analysis. Based on initial results, the manager noticed eggs and potato chips were frequently in the same transactions. After calculating the confidence and the expected confidence on the data, 0.54 and 0.62 respectively, they want to run a lift ratio to ensure there is a positive association. Calculate the lift ratio and determine if the association is positive or negative.

The following results are a subset of a study on the demographics of a city population. Participants were asked to respond if male (1) or female (0), current annual salary, and if they were raised in a suburb (1) or in a city (0). Based on the hierarchical clustering results, which of the following is not a valid observation that can be made?

A dendrogram allows for a visual inspection of the clustering results.

Using the following transactions, what is the frequency distribution?

Based on the following table, what is the frequency distribution of the most purchased item?

Use the proportion of the following transactions that contain both Latte and Scone and calculate the Support of the association rule.

Toilet paper and detergent are the antecedent, where 890 of the 10,000 transactions include both items. Of the overall 10,000 transactions, 234 include toilet paper, detergent, and the consequent of clothing. Using the association rule, what is the confidence?

In the following AGNES algorithm, what type of linkage distance method is being displayed?

Toilet paper and detergent are the antecedent, where 950 of the 6,500 transactions include both items. Of the overall 6,500 transactions, 126 include toilet paper, detergent, and the consequent of clothing. Using the association rule, what is the confidence?

Costco is known for lower prices for bulk items. After calculating the support and confidence values for {toilet paper} => {avocados}, there appears to be a strong association because a large percentage of customers purchase these items. However, to avoid assuming the strength of association, what option should be done to confirm the strength of the association?

Using the following dendrogram created by using the k-means method, identify the number k was given to form the clusters present.

The most commonly used approach for hierarchical clustering is divisive clustering.

When using k-means clustering, the number of clusters are specified at the end of the analysis to remove overlapping clusters.

In reviewing purchases at Costco on a given Saturday, 385 transactions out of 1,000 included toilet paper, detergent, and clothing or {toilet paper, detergent} => {clothing}. Calculate the support of the association rule.