Help me answer the following questions. True or false: In R,it is possible to read a data set directly from a text file located on disk, on a file server, or on a web server.

TrueFalse

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Removing records that contain missing or inconsistent data from a data set before analysis is an example of _________.

• data mining
• missing values
• reduction
• purging

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Which of the following is NOTan example of data scrubbing as described in the text?

• reducing data
• handling inconsistent data
• handling missing data
• handling marginal data

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In R, assuming the existence of a data frame called Employees, the command Employees[1:100, 4:9] would show ___________.

• employee records 4 through 9, 100 times
• columns 4 through 9 for the first 100 employee records
• columns 1 through 100 for employee records 4 through 9
• columns 4 through 9, 100 times

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Descriptive statistics that give insight into norms in a data set are called measures of _______.

• commonality
• central tendency
• similarity
• norms

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To conduct correlational analysis in R, use the _______ function.

• relate
• corr
• mat
• cor

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Correlation coefficients are generally considered strong if they are at least _________.

• 0.2 or -0.2
• 0.95 or -0.95
• 0.6 or -0.6
• none of the above

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The output of a correlationis called a ________.

• matrix
• core set
• similarity index
• match table

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The correlational algorithm developed by ________ is specifically designed to control for outliers in data.

• Kendall
• Thompson
• Spearman
• Pearson

What type of correlation occurs when two attributes are correlated to one another,and as the values in one attribute decrease, the values in the other attribute also decrease?

• positive
• negative
• mutual
• neutral