Basics of R Programming: Data Types and Matrices
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Questions and Answers

What is the primary use of R programming language?

  • Web Development
  • Artificial Intelligence
  • Data Science (correct)
  • Database Management

    • What is the significance of the matrix() function in R?

  • It creates a list of characters
  • It creates a three-dimensional array
  • It creates a two-dimensional array (correct)
  • It creates a one-dimensional array

    • How can you access the element in the 2nd row and 3rd column of a matrix P?

  • P[,3]
  • P[2,3] (correct)
  • P[3,2]
  • P[2,]

    • What is the department of the employee with emp_id 4?

    <p>HR</p> Signup and view all the answers

    What is the purpose of the byrow argument in the matrix() function?

    <p>To arrange elements sequentially by row</p> Signup and view all the answers

    What is the type of the start_date column in the employee_data dataframe?

    <p>Date</p> Signup and view all the answers

    What is the difference between a matrix and an array in R?

    <p>A matrix is a two-dimensional array, while an array can be more than two-dimensional</p> Signup and view all the answers

    What is the purpose of the Pearson correlation test?

    <p>To evaluate the association between two variables</p> Signup and view all the answers

    What is the output of the command print(P[2,])?

    <p>All elements in the 2nd row</p> Signup and view all the answers

    How many rows are in the employee_data dataframe after expansion?

    <p>8</p> Signup and view all the answers

    What is the name of the employee with emp_id 3?

    <p>Michelle</p> Signup and view all the answers

    What is the dimension of the array created in the example?

    <p>4x2x3</p> Signup and view all the answers

    What is the output of print(result[3,2,2])?

    <p>12</p> Signup and view all the answers

    How are the columns and rows named in the matrix?

    <p>Using the column.names and row.names functions</p> Signup and view all the answers

    What is the data type of the object 'factor.data'?

    <p>Factor</p> Signup and view all the answers

    What is the purpose of a factor in R?

    <p>To store categorical data</p> Signup and view all the answers

    What is the structure of a data frame in R?

    <p>A table with variables and observations</p> Signup and view all the answers

    What type of relationship does the Pearson correlation coefficient measure?

    <p>Linear dependence</p> Signup and view all the answers

    What is the assumption of the Spearman rho test?

    <p>Variables should be measured on an ordinal or continuous level</p> Signup and view all the answers

    What is the purpose of the Shapiro test?

    <p>To check for normality of distribution</p> Signup and view all the answers

    When would you use Kendall tau test?

    <p>When there are tied ranks</p> Signup and view all the answers

    What is the graphical method to check for normality of distribution?

    <p>Q-Q plot</p> Signup and view all the answers

    What is the condition to use Pearson correlation coefficient?

    <p>Variables should be measured on an ordinal or continuous level and should be normally distributed</p> Signup and view all the answers

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