Questions

All TestDome questions grouped by skill.
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1728 questions
Dog Classification - The following .csv file contains the data from a classifier model that predicts if an image contains a dog: predictions.csv  The first column contains information if the dog is in the image or not. The second column contains the classifier prediction, which is in the interval 0-100, with higher values meaning that the classifier is more confident that image contains a dog. What is the value of the decision boundary that will maximize the accuracy of the model? Values greater than or equal to the decision boundary will be treated as positive.
New
Data Science
Classification
Decision Boundary
Hard
20 min
num
Public
Rainy Days - It has rained continuously for 15 days. Tomorrow, an important football match is being held in an outdoor stadium. Select which of the following statements are true:
Logical Reasoning
Appeal to Probability
Easy
2 min
mca
Public
Malware Analysis - Your company is analyzing malware software which targets numerical record files. The malware checks the value of each record and the values of some of its neighbors. The record is replaced by 0 when it is smaller or equal to either of those neighbors. For each number, it matches the following pattern, where position 'X', is compared to positions 'T': T, _, _, X, _, _, _, T Positions '_' represent neighbors that are ignored. Positions further beyond the 'T's, to the far left or far right, are also ignored. If the 'X' position is near the left or right border and has no 'T' position neighbor, only one side is considered. The malware finds all the positions first and only then sets them to 0. For example, if the values in a record file are the following: [19, 2, 0, 87, 1, 40, 80, 77, 77, 77, 77] The expected values after the malware runs are: [19, 0, 0, 87, 0, 0, 0, 77, 77, 0, 0] In this example, number 2 was removed because 40 is the bigger number. Implement the simulate function so that the malware behavior is replicated for further study.
New
JavaScript
Arrays
Iteration
Easy
20 min
code
Public
Quantity Projection - ​A business owner needs a Power BI report which shows the projected quantity for each item. The "quantity" column is in the "items" table. Fill in the blank of the following DAX expression for a new column that will compute the projected quantity, which is the current quantity plus 12%:  Projected Quantity = ______________ * 1.12
Power BI
DAX
Easy
5 min
fill
Public
Violin Strings - As a customer support agent for a music equipment company you receive an email from Fatema about a violin she bought last week for her son. She says the strings broke while he was playing in his school’s holiday concert and he was embarrassed to tears. She asks what you can do to make it up to him.
New
Customer Emails
Customer Complaint
Customer Service
Easy
3 min
mmcq
Public
Marketing Costs - Implement the desired_marketing_expenditure function, which returns the required amount of money that needs to be invested in a new marketing campaign to sell the desired number of units. Use the data from previous marketing campaigns to evaluate how the number of units sold grows linearly as the amount of money invested increases. For example, for the desired number of 60,000 units sold and previous campaign data from the table below, the function should return the float 250,000. Previous campaigns Campaign Marketing expenditure Units sold #1 300,000 60,000 #2 200,000 50,000 #3 400,000 90,000 #4 300,000 80,000 #5 100,000 30,000
Python for Data Science
Linear Regression
Machine Learning
NumPy
Scikit-Learn
Hard
30 min
code
Public
Profit Percentage - A Power BI report has a measure declared as: Profit percentage = SUM(financials[Profit]) / CALCULATE(SUM(financials[Profit]), ALL(financials)) Select all the true statements if the "Profit percentage" is used as a value in a bar chart where Country is the axis.
Power BI
DAX
Measure
Hard
5 min
mca
Public
Regional Sales Comparison - An insurance company maintains records of sales made by its employees. Each employee is assigned to a state. States are grouped under regions. The following tables contain the data: TABLE regions id INTEGER PRIMARY KEY name VARCHAR(50) NOT NULL TABLE states id INTEGER PRIMARY KEY name VARCHAR(50) NOT NULL regionId INTEGER NOT NULL FOREIGN KEY (regionId) REFERENCES regions(id) TABLE employees id INTEGER PRIMARY KEY name VARCHAR(50) NOT NULL stateId INTEGER NOT NULL FOREIGN KEY (stateId) REFERENCES states(id) TABLE sales id INTEGER PRIMARY KEY amount INTEGER NOT NULL employeeId INTEGER NOT NULL FOREIGN KEY (employeeId) REFERENCES employees(id) Management requires a comparative region sales analysis report. Write a query that returns: The region name. Average sales per employee for the region (Average sales = Total sales made for the region / Number of employees in the region). The difference between the average sales of the region with the highest average sales, and the average sales per employee for the region (average sales to be calculated as explained above). Employees can have multiple sales. A region with no sales should be also returned. Use 0 for average sales per employee for such a region when calculating the 2nd and the 3rd column. See the example case for more details.
SQL
Aggregation
Left Join
Select
Hard
30 min
code
Public
Reorder Tasks - A client has a web page with a series of tasks. They want to implement a reordering feature that behaves like the following example: After performing the clicks shown in the animation above, the document's body should be: <div> <span>Prepare presentation</span> <button class="downButton" type="button">&darr;</button> </div> <div> <span>Read emails</span> <button class="downButton" type="button">&darr;</button> <button class="upButton" type="button">&uarr;</button> </div> <div> <span>Monthly report</span> <button class="upButton" type="button">&uarr;</button> </div> Implement the function initialize to add the requested functionality. The reordering behavior should work with any number of tasks.
New
JavaScript
DOM Manipulation
Event Handling
Hard
30 min
code
Public
AB Test - Your company is running a test that is designed to compare two different versions of the company’s website. Version A of the website is shown to 60% of users, while version B of the website is shown to the remaining 40%. The test shows that 8% of users who are presented with version A sign up for the company’s services, as compared to 4% of users who are presented with version B. If a user signs up for the company’s services, what is the probability that she/he was presented with version A of the website?
Data Science
Bayes' Theorem
Probability
Hard
7 min
num
Public
Election Poll - Each day during 2019 an agency asked a hundred randomly selected people which party they would vote for if elections were held that day. Results of the poll were recorded in the following file. The Workers' Party asked for the report which they plan to use to improve their strategy for upcoming elections. Fill in the missing values in the report for 2019: The arithmetic mean of votes for the Workers' Party is: __ (rounded to one decimal place) The median of votes for the Workers' party is: __ (rounded to closest integer) The standard deviation of votes for the Workers' party is: __ (rounded to one decimal place) The difference between the largest and the smallest number of votes for the Workers' party for March is: __ The largest number of votes that any party received on any day is: __ votes. That maximum was achieved on 2019-__-__ by __. The party with the largest difference between the maximum and minimum number of votes is _______. That difference is __ votes.
New
Data Science
Descriptive Statistic
Exploratory Data Analysis
Easy
20 min
fill
Public
Horse Race - Dan put a large bet on a horse. However, a day before the race, the horse was injured. Select which of the following statements are true:
Logical Reasoning
Appeal to Probability
Easy
1 min
mca
Public
Stock Prices - As an entry-level financial analyst, your manager asked you to analyze the prices of a new stock and make a buy-sell recommendation. Daily price trends seems to fluctuate as can be seen below: You need to create a new measure which will create a rolling average for 7-day periods, as below, because an increasing trend in a rolling average may signal an increase in the price of the stock. How should you configure the quick measure, shown below, for the rolling average for the last 7 days?
New
Power BI
Quick Measures
Easy
5 min
mca
Public
Social Network - A new social network site has the following data tables: users id name sex 1 Ann null 2 Steve m 3 Mary f 4 Brenda f friends user1 user2 1 2 1 3 2 3 Select data that will be returned by the following SQL query: SELECT users.name, COUNT(*) as count FROM users LEFT JOIN friends ON users.id = friends.user1 OR users.id = friends.user2 WHERE users.sex = 'f' GROUP BY users.id, users.name;
SQL
Conditions
Left Join
Select
Easy
5 min
mca
Public
Pet Detection - A classifier that predicts if an image contains only a cat, a dog, or a llama produced the following confusion matrix:   True values     Dog Cat Llama Predicted values     Dog 14 2 1 Cat 2 12 3 Llama 5 2 19 What is the accuracy of the model, in percentages?
Data Science
Confusion Matrix
Machine Learning
Easy
5 min
num
Public
Album Sales - An eagerly awaited new album has been leaked several hours before its official release. Listeners are now able to download the album for free. How will this affect album sales?
Logical Reasoning
Zero-Sum Thinking
Easy
1 min
mcq
Public
Cron - The output of crontab -l contains the following job definitions: MAILTO=candidate@testdome.org,admin@testdome.org 0 0,12 1 */4 * df -h / @hourly du -h / >> /var/log/disk_usage 0 6 1-12 * * /usr/bin/testdome_candidates Select the statements about the job definitions and schedules that are correct.
Linux Administration
Scheduling
Hard
3 min
mca
Public
Student Majors - A university's Office of Admission keeps track of student majors. Each student can have a single major. Below is an example of how their system stores students, majors, and how it manipulates them: students = [("Allen Anderson", "Computer Science"), ("Edgar Einstein", "Engineering"), ("Farrah Finn", "Fine Arts")] def add_new_student(students, name, major): students.append((name, major)) def update_student(students, index, name, major): students[index] = (name, major) def find_students_by_name(students, name): return [student for student in students if name in student[0]] def get_all_majors(students): return [student[1] for student in students] What can be concluded from the code snippet above?
New
Python
Lists
Tuples
Easy
3 min
mca
Public
Petri Dish - Two bacteria cultures, A and B, were set up in two different dishes, each covering 50% of its dish. Over 20 days, bacteria A's percentage of coverage increased to 70% and bacteria B's percentage of coverage reduced to 40%:
Data Science
Correlation
Easy
5 min
mmcq
Public
Semantics - Update the website's HTML, without using JavaScript or CSS, to make use of semantic elements so that: The classless outer div element is replaced with a more appropriate element. The divs with the image and caption classes are replaced with self-contained content elements. The divs with the lorem-ipsum and description classes are replaced with elements, so that by default only the contents of the description element are shown. When the contents of the description element are clicked, the visibility of the rest of the lorem-ipsum element is toggled.
HTML/CSS
Elements and Attributes
HTML5
Semantic Tags
Easy
7 min
code
Public