Table 1.12 lists the reading comprehension scores for nine students at a small private school known for its academic excellence. Twenty students were admitted to the kindergarten class, and the nine students in the table stayed at the school through eighth grade. The scores are percentiles relative to students at suburban public schools; for example, Student 1 scored in the 98th percentile in first grade and in the 53rd percentile in second grade. Identify the following data as cross-section, time series, or panel data:

a. Student 4’s scores in grades 1 through 8.

b. The nine students’ eighth grade scores.

c. The nine students’ scores in first grade and eighth grade.

d. The nine students’ scores in first grade through eighth grade.

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Student Grade 1 2 3 4 5 6 7 8 9 1234567 98 87 87 92 22 80 80 72 98 87 53 72 89 72 45 35 62 62 81 98 52 94 60 73 26 26 94 88 72 55 96 51 68 34 68 94 59 62 62 68 35 47 18 99 95 95 63 53 80 38 33 53 69 69 85 97 61 79 8 47 32 65 65 53 74 55 65 31 15 31 74 46 55 31