BBE FIRST WEEK
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Questions and Answers

What does a positive value of kurtosis indicate about a distribution?

  • It is skewed to the right (correct)
  • It is normally distributed
  • It is flat
  • It is skewed to the left

    • Which plot uses the median, quartiles, and maximum and minimum values as a summary of a frequency distribution?

  • Histogram
  • Bar graph
  • Box and whisker plot (correct)
  • Scatter plot

    • What are outliers in a data set?

  • Data points close to the median
  • Data points with average values
  • Data points with extreme values differing significantly from others (correct)
  • Data points with missing values

    • What does Q3 represent in quartiles?

    <p>The value that ¾ of the data points are less than</p> Signup and view all the answers

    What does P25 represent in percentiles?

    <p>The value that 25% of the population is less than</p> Signup and view all the answers

    In what type of distribution does a normal distribution have a kurtosis value near zero?

    <p>Peaked distribution</p> Signup and view all the answers

    What is the purpose of dividing by (n-1) instead of n when calculating the sample mean?

    <p>To reduce the impact of outliers on the sample mean</p> Signup and view all the answers

    Why shouldn't real values of outliers be discarded?

    <p>They are useful for investigating shape of the distribution</p> Signup and view all the answers

    What does a variance being a negative number indicate?

    <p>It is not possible for variance to be negative</p> Signup and view all the answers

    In the context of variance, what does a large value indicate?

    <p>High variability in the data</p> Signup and view all the answers

    What kind of diagram is used to represent the age distribution of patients in one town?

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

    How would you describe the shape of the age distribution of patients in one town?

    <p>Bell-shaped (normal)</p> Signup and view all the answers

    What measure of central tendency would you use to compute the sample diastolic blood pressure mean?

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

    What measure of central tendency would you use to compute the sample diastolic blood pressure mode?

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

    What is the mean HbA1c level from the given data for 10 children?

    <p>5.5</p> Signup and view all the answers

    What could be concluded about the value 18 in the given HbA1c data?

    <p>It is an outlier and should be removed from the data set before calculating the mean</p> Signup and view all the answers

    What type of variable is 'Self-rated health'?

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

    What type of variable is 'Total cholesterol concentration'?

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

    What type of variable is 'Economic activity'?

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

    What type of variable is 'Having lung cancer or not'?

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

    In the context of biomedical datasets, what kind of variable would 'Obesity: BMI≥30' be classified as?

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

    What kind of variable is 'Marital status (married, divorced, widowed, ever single)'?

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

    What type of variable are 'Restaurant star ratings' and 'Severity of pain (none, some, a lot)'?

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

    In a biomedical dataset, how would 'Rank on a scale of 1-5 your degree of satisfaction' be categorized?

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

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