Since October, we have been looking at two different numbers that have been used to describe the availability of physics in U.S. high schools: 60% and 95%. The U.S. Department of Education Office of Civil Rights (OCR) uses data from all public schools to calculate the 60%. AIP Statistics uses data from public and private regular and vocational schools to calculate the 95%. Last month we noted that a large part of the difference is explained by differences in the number of schools used in the denominator of the calculation. We also noted that the 95% is the proportion of seniors enrolled in schools that offer physics regularly (that is, at least in alternating years). Smaller schools are more likely to offer physics in alternating years.

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