ISAT: Understanding p-values
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September 5, 2025 1:00 AM
I would like to respond to a recent letter by Mr. Robert Lem regarding Superintendent Critchfield’s characterization of Idaho’s 2025 ISAT results. Mr. Lem writes:
“Using a standard p-value of 0.05, any improvement in scores must show at least a gain of five percentage points in order to be considered statistically significant. So, for example, even the slight decline in 4th grade ISAT scores in Idaho (2024: 67.1%, 2025: 64.6%) is not significant.”
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