Khan Academy

Researchers were studying how playing a dancing video game impacts heart rate. They measured the heart rates (in beats per minute) of 151515 subjects before they danced a song and again after they finished dancing the song. They want to use these results to estimate the average difference between before and after heart rates. a paired t interval for mean difference The owners of a large shopping complex wondered if there was a relationship between how customers traveled to the complex...

A truth table shows the output values for a logic gate based on a set of input values. Consider the following truth table: 0 0 0 0 1 1 1 0 1 1 1 1 Which logic gate has a truth table that looks like that table? OR Gate A computer is built up from layers of components. The lowest level components are responsible for tiny computations, and the highest level components are responsible for sophisticated multistep computations. Which of these lists correctly sorts components from high-lev...

Aisha sends an email message to her classmate Jamarion asking him to the prom. Which of these actions can Jamarion do without the consent of Aisha? ️Note that there may be multiple answers to this question. Reply to the message with another classmate CC'ed Forward the message to another classmate Take a screenshot of the message Replying to the message with another classmate BCC'ed Zaniyah wants to share photos of her newborn baby on her public social media account. She want...

Lana visits a news website she's never visited before. She notices a section called "Recommended for you" with a list of articles that are related to articles she'd been reading on other news sites. Which technology was most likely responsible for the recommended articles? web cookies If a website wants to track which pages a user visits on their website, what is required technically? None of the above Horacio is new to the Web and is concerned about his privacy while us...

Khan academy Test UPDATED ACTUAL Questions and CORRECT Answers In an experiment, acid was added to two solutions: Solution 1: distilled water only Solution 2: distilled water containing sodium bicarbonate Then, the pH of each solution was taken. Solution 1 had a final pH of 4.5, while Solution 2 had a final pH of 6.8. Which of the following statements explains the difference between the two solutions? (Choice A,

Khan Academy unit Exam Questions With Verified Answers Lana visits a news website she's never visited before. She notices a section called "Recommended for you" with a list of articles that are related to articles she'd been reading on other news sites. Which technology was most likely responsible for the recommended articles? - answerweb cookies If a website wants to track which pages a user visits on their website, what is required technically? - answerNone of the above Horacio is...

Khan Academy Exam

KHAN ACADEMY QUESTIONS AND ANSWERS ALREADY PASSED A warehouse stores thousands of marble slabs of different shapes, sizes, and materials that are used for construction projects. The manager wants to estimate the average weight of these slabs. The slabs are arranged in stacks that have about 10 slabs of different varieties. The manager wants to weigh a random sample of 100 slabs. Why might the manager choose a cluster random sample instead of a stratified random sample in this setting? E...

Khan Academy Grammar Latest Update 100% Correct Noun Person/Place/Thing/Idea/ Feelings Singular Nouns One Thing (Car) Plural Nouns More Than One Thing (Cars) Common Nouns general names (girl/building/car) Proper Nouns Specific Names (Kim/Michelle) Concrete Nouns Physical Item (ball/building/car) Abstract Nouns Non-Physical Item linking Verbs Do not show action & connect the subject to more information about the subject. (Am/Is/Are/Was/Were/Be/Being/Been) (Ben is kind...

Khan Academy Questions and Answers Graded A+ Passage 1 Which choice best summarizes the passage? A character faces a difficult situation and describes the experience of confronting it. In the first paragraph, the words "Heaven," "Firmament", and "Stars" serve mainly to? emphasize the height of the skysail It can reasonably be inferred that the narrator decides to loosen the skysail because? the other sailors on the ship agreed that he should Which choice provides the ...

Nikolas is looking at the files for a project he's working on: Which file was modified the longest time ago? Which file is the largest? Which file type appears the most in this listing? png Sort these component from high-level (at the top) to low-level (at the bottom): CPU logic circuit logic gate transistor 8 1,2,2,2,1 1,2,2,2,1 8 8 2,4,2 1,1,4,1,1 8 In this RLE scheme, the numbers represent alternating runs of black and white pixels and the first nu...

Joo-won is writing code to calculate the volume of a cone based on this formula: Volume=(Pi(r)^2)(h/3) He's testing his code on this cone: The code starts with these variables, where radius represents rrr and height represents hhh: radius ← 2 height ← 5 The built-in constant PI stores an approximation of PI Which expression correctly calculates the volume? PI (radius radius) * (height / 3) A local search website lets users create lists of their favorite restaurants. When...

A digital artist is creating an animation with code. Their code needs to convert polar coordinates to cartesian coordinates, using these formulas: x = r × cos( θ )y = r × sin( θ )x=r×cos(θ)y=r×sin(θ) The environment provides these built-in procedures: NameDescriptionsin(angle)Returns the sine of the given (angle)Returns the cosine of the given angle. In their code, theta represents the current angle and r represents the current radius. Which of these code snippets properly imple...