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Python Exploratory Data Analysis

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Python Exploratory Data Analysis

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1. You are presented with a dataset that is a 25% simple random sample of a database containing all current members of Congress. Variables include gender, tenure, -home state, and age. You have access to the entire database. What can you do to validate that the sample taken is truly random

Compute the ratio of the number of rows in the sample to the number of rows in the complete database. If the ratio is equal to 0.25, the sample was taken -correctly.Identify which state has the greatest number of records in the sample dataset and which state has the greatest number of records in the entire database. If they -match, the sample was taken correctly.Take your own simple random sample from the entire database and compare the rows with the sample that you were presented. The difference should be minimal.Compare the distribution of gender and home state, as well as the average tenure and age in the sample with that of the entire Congress. All of these values -should be approximately equal

2. You want to compute the variance of a dataset that came from a sample, and have already computed the sum of square deviations from the mean. What is the next step

Divide by the number of observations minus 1Divide by the number of observations plus 1Divide by the number of observations plus 2Divide by the number of observations minus 2.

3. If the correlation between two variables is -0.9, what can you conclude?

There is a weak negative relationship between the two variables.There is almost zero relationship between the two variables.There is a strong negative relationship between the two variables.There is a perfectly negative relationship between the two variables.

4. What is defined as a measure of central tendency?

Standard deviationMeanCorrelationKurtosis

5. You are given time-series data and are asked whether there is a trend. Which type of plot will help you answer the question?

Line plotBox plotViolin plotHistogram

6. You are given a dataset that is centered at 10, with a standard deviation of 4. You notice that one of the observations is a value of 19. What can you
conclude about that observation

It is between 1 and 2 standard deviations from the meanIt is greater than 3 standard deviations from the mean.It is greater than 2 standard deviations from the mean.It is exactly 2 standard deviations from the mean.

7. Which of the following plots allows for easy identification of outliers?

Line plotContour plotBox plotBar chart

8. What is the main difference between exploratory data analysis (EDA) and classical data analysis (CDA)?

In EDA, you apply a model before performing an analysis.In EDA, you perform an analysis before applying a modelIn EDA, you perform an analysis with no intention of applying a modelIn EDA, you perform an analysis and apply a model simultaneously.

9. Which of the following plots allows for easy identification of outliers?

Box plotLine plotContour plotBar chart

10. How would you visually testif covariance occurs between a continuous variable and a categorical variable?

With a tile plotWith a scatter plotWith a bar plotWith a frequency polygon plot

11. What is defined as a measure of central tendency?

Standard deviationKurtosisCorrelationMean

12. What is the mode of a dataset?

The average value of the datasetThe difference between the maximum value and the minimum value in the datasetThe value that separates the top half of the dataset from the bottom halfThe value that occurs the most frequently

13. You want to compute the variance of a dataset that came from a sample, and have already computed the sum of square deviations from the mean. What is the next step

Divide by the number of observations minus 2.Divide by the number of observations plus 1Divide by the number of observations plus 2Divide by the number of observations minus 1

14. You have a small dataset that has values very close to each other. You compute the median and the mean, then add an extremely high value to the dataset, far -from the others, and recompute the median and mean. What happens to both the median and mean values

Both the mean and median move up much higher.The mean stays roughly the same, but the median moves up much higher.Neither the median or the mean move very much.The median stays roughly the same, but the mean moves up much higher.

15. What is the mode of a dataset?

The value that separates the top half of the dataset from the bottom halfThe average value of the datasetThe difference between the maximum value and the minimum value in the datasetThe value that occurs the most frequently

16. What is a characteristic of a correlation value?

It is always between -1 and 1.It is always greater than the covariance value.It is always between -100 and 100.It is never possible to get a correlation value of .

17. You are presented with a dataset that is a 25% simple random sample of a database containing all current members of Congress. Variables include gender, tenure, -home state, and age. You have access to the entire database. What can you do to validate that the sample taken is truly random

Identify which state has the greatest number of records in the sample dataset and which state has the greatest number of records in the entire database. If they -match, the sample was taken correctly.Compute the ratio of the number of rows in the sample to the number of rows in the complete database. If the ratio is equal to 0.25, the sample was taken -correctly.Compare the distribution of gender and home state, as well as the average tenure and age in the sample with that of the entire Congress. All of these values -should be approximately equalTake your own simple random sample from the entire database and compare the rows with the sample that you were presented. The difference should be minimal.

18. You have a small dataset that has values very close to each other. You compute the median and the mean, then add an extremely high value to the dataset, far -from the others, and recompute the median and mean. What happens to both the median and mean values

Both the mean and median move up much higher.The median stays roughly the same, but the mean moves up much higher.The mean stays roughly the same, but the median moves up much higher.Neither the median or the mean move very much.

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Privacy | Terms |

Without work one finishes nothing. - Ralph Waldo Emerson
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