shown-below-is-a-histogram-of-the-last-digits-units-place-of-scores-from-a-large

Question

Shown below is a histogram of the last digits (units place) of scores from a large set of test results from a high school math department. Each score is out of $100$ , and the last digit ( $0$ through $9$ ) is recorded for analysis. Identify the frequencies of each digit. Then, test the claim that the last digits of the scores are uniformly distributed—that is, each digit from $0$ to $9$ is equally likely. Use $5 percent sign$ level of significance. Does the data suggest any potential grading bias or irregularity in how scores are assigned?

Histogram showing frequencies of last digits (0-9) in student test scores, with peaks at 0 and 5.

Accepted Answer

The digits are uniformly distributed; there is no evidence of grading bias or irregularity.

Answer

The digits are not uniformly distributed; there is strong evidence of grading bias.

Answer

The digits are uniformly distributed; however, there is still strong evidence of grading bias.

Answer

The digits are not uniformly distributed and also there is no evidence of grading bias.