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Unformatted text preview: Scoring Guidelines
(c) Clearly explains a double blind experiment—neither the subjects nor those
administering the drugs or monitoring results know which of the two
drugs is being used.
An answer of yes without explanation receives no credit.
An answer of no could receive credit if the design described in part (b)
does not allow for doubleblinding. Scoring:
Parts (a) and (b) will be scored as either essentially correct (E), partially correct (P), or incorrect
(I).
Part (c) will be scored as either essentially correct (E) or incorrect (I).
Part (a) is:
Essentially correct if all three of the criteria are met
Partially correct if two of the three of the criteria are met
Incorrect if one or none of the three criteria are met
Part (b) is:
Essentially correct if the two criteria are met
Partially correct if only one of the two criteria is met, given that blocking has
been indicated
Incorrect if none of the two criteria are met
Part (c) is:
Essentially correct only if the writer correctly communicates he/she knows what
double blind means
Incorrect otherwise Copyright © 2000 College Entrance Examination Board and Educational Testing Service. All rights reserved.
AP is a registered trademark of the College Entrance Examination Board. AP® Statistics 2000 ─ Scoring Guidelines
Scoring
4 Complete Response
Essentially correct on all three parts. 3 Substantial Response
Part (c) is essentially correct, and parts (a) and (b) have exactly one essential and
one partial.
OR
Part (c) is incorrect, and parts (a) and (b) are both essentially correct. 2 Developing Response
Part (c) is essentially correct, and parts (a) and (b) have at least one partial or
exactly one essential.
OR
Part (c) is incorrect, and parts (a) and (b) have exactly one essential and one
partial. 1 Minimal Response
Only part (c) is essentially correct.
OR
Part (c) is incorrect and parts (a) and (b) are both partially correct or have
exactly one essential. 0 No credit Note: Only one partial in parts (a) or (b) and an...
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 Spring '13
 Mosby
 Statistics, AP Statistics

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