Question

Question 1
Fill in the blank: If a data professional calculates a statistical power of at least 80%, it is likely their experiment results are due to a _____ between the groups being compared, rather than random chance.



real difference



slight similarity



predicted connection



confirmed anomaly


1 point
2.
Question 2
A government agency operates an array of weather sensors. The sensors use the electrical resistance of a piece of platinum (Pt) to detect temperature. The raw data from these sensors is in Pt ohms. This data is sent to a database, where it is then encoded in Celsius. One of the sensors was replaced with a unit whose raw data output is pre-converted to degrees Celsius. When the output was sent to the database, the Pt ohms to degrees Celsius formula was applied a second time, causing confusion around the readings from this sensor. What data integrity problem does this scenario describe?


Security vulnerability



Replication



Manipulation



Transfer


1 point
3.
Question 3
In a survey about a new type of sustainable material, 55% of respondents report they would be willing to pay more for clothes made from this material. The margin of error for the survey is 3%. Based on that margin of error, what range reflects the population's true response?



50-53%



52-58%



58-60%



50-52%


1 point
4.
Question 4
A high school principal estimates the total number of students who will attend an upcoming event. Assuming that the older students are unlikely to attend, the principal decides to only survey first- and second-year students. What is likely to result?



Random sampling



Unbiased sampling



Geographically limited sampling



Sampling bias


1 point
5.
Question 5
Fill in the blank: A data analyst uses _____ to determine whether an experiment or survey has meaningful results.


approximation



hypothesis testing



trial and error



estimation


1 point
6.
Question 6
A data professional in the logistics industry wants to calculate the margin of error for a study about transportation route efficiency. They know the population size and sample size. What must they also know in order to accurately calculate margin of error?


Testing methodology



Distribution



Confidence level



Correlation


1 point
7.
Question 7
A data professional copies a dataset from a USB drive to their computer. They accidentally unplug the USB before the process is complete, which causes the dataset on their computer to be incomplete. What data integrity problem does this scenario describe?


Manipulation



Replication



Cleaning



Transfer


1 point
8.
Question 8
Which of the following statements accurately describe sample size, population, and confidence level? Select all that apply.



When data professionals use sample size, they are using a part of a population that is representative of the population.



Having an 80% confidence level is ideal, but most industries hope for 70-75%.



Confidence level is the probability that a sample accurately reflects the greater population.



Random sampling involves selecting a sample from a population so that every possible type of the sample has an equal chance of being chosen.


1 point

Answer 1

1. real difference

2. Manipulation

3. 52-58%

4. Sampling bias

5. hypothesis testing

6. Confidence level

7. Transfer

8. Select statements 1, 3, and 4.