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## Education Statistics > Assessments > Scale Score, Grade 4 Science (most recent) by state

DEFINITION: For each different subject, NAEP creates a scale score based on statistical procedures called item response theory (IRT). IRT is a set of statistical procedures useful in summarizing student performance across a collection of test exercises requiring similar knowledge and skills. All NAEP subject area scales are produced using these procedures. In Math and Reading, NAEP creates a scale ranging from 0-500. In Science and Writing, NAEP creates a scale ranging from 0-300.
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Showing latest available data.
Rank   States  Amount
# 1     Massachusetts: 162
# 2     Maine: 161
= 3     Iowa: 160
= 3     Montana: 160
= 3     North Dakota: 160
# 6     Vermont: 159
# 7     Wyoming: 158
# 8     Minnesota: 157
= 9     Connecticut: 156
= 9     Missouri: 156
= 9     Virginia: 156
= 12     Indiana: 155
= 12     Utah: 155
= 14     Michigan: 154
= 14     Ohio: 154
# 16     Idaho: 153
= 17     Kentucky: 152
= 17     Oklahoma: 152
# 19     Illinois: 151
= 20     West Virginia: 150
 = 20 Oregon: 150 = 20 Nebraska: 150 # 23 New York: 149 = 24 North Carolina: 148 = 24 Rhode Island: 148 = 26 Texas: 147 = 26 Tennessee: 147 # 28 Maryland: 146 # 29 Arkansas: 144 = 30 Alabama: 143 = 30 Georgia: 143 # 32 Nevada: 142 = 33 Arizona: 141 = 33 South Carolina: 141 # 35 Louisiana: 139 # 36 New Mexico: 138 # 37 Hawaii: 136 # 38 Mississippi: 133 # 39 California: 131 Weighted average: 149.7

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