Unit 2: Data

How is the decimal number 13 represented in binary?

What is the decimal equivalent of the binary number 10110?

An image is stored using 3 bits per pixel. How many different colors can each pixel represent?

Which of the following is a primary purpose of data compression?

What is the difference between lossy and lossless compression?

Which of the following is an example of metadata?

A computer uses 4 bits to represent each pixel of a black-and-white image. The image is 100 pixels wide and 200 pixels tall. How many bits are needed to store this image (without compression)?

Which of the following statements about overflow errors is true?

A music streaming service uses a sampling rate of 44,100 samples per second and 16 bits per sample for stereo audio (2 channels). How many bits are needed for one second of audio?

A dataset contains information about students including name, grade, and test scores. Which of the following questions CANNOT be answered using only this dataset?

An analog sound wave is sampled at different rates. Which statement about sampling rate is correct?

What is the largest unsigned integer that can be represented with 4 bits?

What is the decimal value of the binary number 1011?

An overflow error occurs when:

Lossless compression:

Which is an example of lossy compression?

When converting an analog signal to digital, the process involves:

In an RGB color model, each color channel uses 8 bits. How many total bits are needed to represent one pixel?

When cleaning data from a large dataset, which is most important?

What is the decimal value of binary 11001?

What is the binary representation of decimal 42?

Unicode is important because it:

Large datasets can reveal patterns through:

A roundoff error occurs because:

To uniquely represent 200 different values, the minimum number of bits needed is:

A dataset of student grades across 5 years can best be used to:

The trade-off of using lossy compression on an audio file is:

What is the binary sum of 1010 + 0111?

A researcher has a spreadsheet with 10,000 rows of data about bird sightings including date, species, location coordinates, and weather conditions. She wants to determine which species are most commonly spotted during rainy weather. Which of the following approaches is most appropriate?

A music streaming service stores each song using 16-bit audio samples at a rate of 44,100 samples per second. Approximately how much storage is needed for a 4-minute song (uncompressed)?

A city government collects data on traffic accidents including location, time, road conditions, and number of vehicles involved. The data reveals a strong correlation between accident frequency and the number of fast-food restaurants nearby. Which conclusion is most appropriate?

A researcher collects data on 10,000 students including name, GPA, ZIP code, and extracurricular activities. The researcher publishes the dataset after removing student names. Which concern is most valid?

A music streaming service stores each song as a digital file. Which of the following is true about the digitization of the audio signal?

A dataset contains information about 500 cities including population, median income, and crime rate. A programmer creates a scatter plot of median income vs. crime rate and finds a negative correlation. Which conclusion is most appropriate?

An image is stored as a 1920×1080 grid of pixels, with each pixel using 24 bits for color (8 bits each for red, green, blue). Approximately how many megabytes of storage does the uncompressed image require?