BBE FIRST WEEK

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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?

The value that ¾ of the data points are less than (A) Signup and view all the answers

What does P25 represent in percentiles?

The value that 25% of the population is less than (B) Signup and view all the answers

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

Peaked distribution (A) Signup and view all the answers

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

To reduce the impact of outliers on the sample mean (A) Signup and view all the answers

Why shouldn't real values of outliers be discarded?

They are useful for investigating shape of the distribution (A) Signup and view all the answers

What does a variance being a negative number indicate?

It is not possible for variance to be negative (D) Signup and view all the answers

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

High variability in the data (B) Signup and view all the answers

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

Histogram (D) Signup and view all the answers

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

Bell-shaped (normal) (A) Signup and view all the answers

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

Mean (B) Signup and view all the answers

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

Mode (A) Signup and view all the answers

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

5.5 (C) Signup and view all the answers

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

It is an outlier and should be removed from the data set before calculating the mean (C) Signup and view all the answers

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

Ordinal (A) Signup and view all the answers

What type of variable is 'Total cholesterol concentration'?

Quantitative (D) Signup and view all the answers

What type of variable is 'Economic activity'?

Nominal (D) Signup and view all the answers

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

Binary (C) Signup and view all the answers

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

Binary (B) Signup and view all the answers

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

Nominal (B) Signup and view all the answers

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

Ordinal (B) 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?

Ordinal (C) Signup and view all the answers

Positive Kurtosis

A distribution with a peak higher and sharper than a normal distribution.

Box and Whisker Plot

A plot showing the median, quartiles, and extreme values of a dataset, useful for visualizing the distribution.