Practice Test GeeksNJSLA Exam Practice Test
← All NJSLA Flashcard Decks

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 bag contains 3 red marbles, 5 blue marbles, and 2 green marbles. If one marble is drawn at random, what is the probability it is blue?

    Answer: 1/2

    There are 5 blue marbles out of 10 total, so the probability is 5/10 = 1/2.

  2. A stem-and-leaf plot shows stems 4, 5, 6, 7 with leaves 2 3 | 1 5 9 | 0 4 | 3. How many data values are in the 50s?

    Answer: 3

    The stem 5 has leaves 1, 5, and 9, representing values 51, 55, and 59 — three values in the 50s.

  3. Which of the following best describes a situation where two events are independent?

    Answer: Flipping a coin twice, where the result of the first flip does not affect the second

    Two events are independent when the outcome of one does not change the probability of the other, as in flipping a coin twice.

  4. A data set has a mean of 50 and a standard deviation of 5. A value of 65 is how many standard deviations above the mean?

    Answer: 3

    The z-score is (65 − 50) / 5 = 15 / 5 = 3 standard deviations above the mean.

  5. On a dot plot, several dots are stacked at the value 7, and the rest are spread between 1 and 5. What does the cluster at 7 suggest?

    Answer: 7 is the most frequent value in the data set.

    A stack of dots at a single value on a dot plot shows that value was observed multiple times, making it the most frequent.

  6. A student wants to determine whether taller students tend to score higher on a math test. Which type of graph should they use?

    Answer: Scatter plot

    A scatter plot displays the relationship between two numerical variables, making it ideal for examining whether height and test scores are correlated.