[
    {
        "question": "Which of the following R data structures are homogeneous:",
        "type": "many_choice",
        "shuffle_answers": true,
        "answers": [
            {
                "answer": "Vector",
                "correct": true,
                "feedback": "Correct."
            },
            {
                "answer": "Matrix",
                "correct": true,
                "feedback": "Correct."
            },
            {
                "answer": "Array",
                "correct": true,
                "feedback": "Correct."
            },
            {
                "answer": "List",
                "correct": false,
                "feedback": "Incorrect.  A list can contain any type of data."
            },
            {
                "answer": "Data Frame",
                "correct": false,
                "feedback": "Incorrect.  A column of a data frame can be of any data type, but the data within a given column must be of the same type."
            },
                        {
                "answer": "Tibble",
                "correct": false,
                "feedback": "Incorrect.  A tibble is a modified data frame."
            }
        ]
    },
    {
        "question": "Which if the following is true of a matrix?",
        "type": "many_choice",
        "shuffle_answers": true,
        "answers": [
            {
                "answer": "2-dimensional",
                "correct": true,
                "feedback": "Correct."
            },
            {
                "answer": "Homogeneous",
                "correct": true,
                "feedback": "Correct."
            },
            {
                "answer": "1-dimensional",
                "correct": false,
                "feedback": "Incorrect."
            },
            {
                "answer": "Heterogeneous",
                "correct": false,
                "feedback": "Incorrect."
            },
                        {
                "answer": "Must be a square",
                "correct": false,
                "feedback": "Incorrect.  The matrix can have unequal dimensions."
            },
                        {
                "answer": "Is an array",
                "correct": true,
                "feedback": "Correct.  A matrix is a special type of array."
            }
        ]
    },
    {
        "question": "When working with data frames, you must be cautious because:",
        "type": "many_choice",
        "shuffle_answers": true,
        "answers": [
            {
                "answer": "If different data types exist in the data frame, all data will be coerced to a single type.",
                "correct": false,
                "feedback": "Incorrect.  A data frame is a heterogeneous data structure."
            },
            {
                "answer": "If a given column contains different data types, all data within that column will be coerced to a single data type.",
                "correct": true,
                "feedback": "Correct."
            },
            {
                "answer": "Missing data will be thrown out.",
                "correct": false,
                "feedback": "Incorrect.  R can account for missing data."
            },
            {
                "answer": "R may become confused if your imported input files are not well-formatted.",
                "correct": true,
                "feedback": "Correct.  Beware of Excel."
            }
        ]
    }
]