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NJSLA Data Analysis and Statistics Flashcards

6 cards from real NJSLA practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 6 NJSLA Data Analysis and Statistics flashcards as text

  1. A student recorded the following test scores: 72, 85, 90, 68, 95, 80. What is the median score?

    Answer: 82.5

    When the six scores are ordered (68, 72, 80, 85, 90, 95), the median is the average of the 3rd and 4th values: (80 + 85) / 2 = 82.5.

  2. Which measure of central tendency is most affected by an outlier?

    Answer: Mean

    The mean is most affected by outliers because it sums all values and divides by the count, so an extreme value shifts it significantly.

  3. A box plot shows a minimum of 10, Q1 of 20, median of 35, Q3 of 50, and maximum of 70. What is the interquartile range (IQR)?

    Answer: 30

    The IQR equals Q3 minus Q1, so 50 − 20 = 30.

  4. A scatter plot shows points trending upward from left to right. This indicates which type of correlation?

    Answer: Positive correlation

    When both variables increase together and the points trend upward, the data shows a positive correlation.

  5. A survey of 200 students found that 60 prefer math. What percentage prefer math?

    Answer: 30%

    60 divided by 200 equals 0.30, which is 30%.

  6. Which display is best for showing the distribution of a single set of numerical data?

    Answer: Histogram

    A histogram groups numerical data into intervals and shows the frequency of each interval, making it ideal for displaying distribution.