Cracking the AP Chemistry Exam, 2016 Edition (College Test Preparation)
More product info
From Princeton Review
Refresh the report to view the most up-to-date data available:
Report Card
Most Trusted Reviews
TRUST
- Unverified Purchaser
- Take-Back Reviewer (4 deleted Reviews; avg. rating: 5.0)
- Easy Grader (avg. rating: 4.5)
Least Trusted Reviews
TRUST
- Verified Purchaser
- Overrepresented word count (1 word)
- Single-Day Reviewer (posted all reviews on Feb 22, 2016)
- Take-Back Reviewer (1 deleted Review; avg. rating: 1.0)
- Overlapping Review History: reviewed 1 of 9 top products
- Overrepresented Participation (posted 10 Reviews)
- Critical Reviewer (avg. rating: 3.4)
Analysis Details
We discovered a total of 8 deleted Reviews for this product, with an average rating of 4.8. Even though deleted reviews don't affect the average rating, the fact that action was taken to delete reviews raises some red flags about the integrity of the reviews for the product as whole.
There are a few limitations to keep in mind regarding the Deleted Reviews test:
- We don't have a magic ability to collect every single deleted review; we can only identify reviews as deleted if we collect them on one date and then notice they are no longer visible on a subsequent date.
- We have no information on reviews that were never published in the first place.
- We also don't know why these reviews were removed. It could be action from the platform, personal decision by the review author, part of an entire account closure, even some data error on our part, etc.
-
- 65%
- Have an overrepresented word count
In the graph above, we can see the distribution of review word counts for this product and the expected distribution for this category. We see the following 2 groups with a statistically significant greater concentration than what we'd expect to see:In total, we found that 35 reviews (or 65%) are within an overrepresented word count group. These reviews have rated this product an average of 4.5, while all other reviews have rated this product an average of 3.6. Based on our statistical modeling, the discrepancy in average rating between these two groups is significant enough to believe that the difference is not due to random chance, and may indicate that there are unnatural reviews.
9% also reviewed:
AP Chemistry Crash Course, 2nd Ed., Book +... by Adrian Dingle
6% also reviewed:
Single Variable Calculus: Early Transcendentals by Stewart, James
6% also reviewed:
AP Calculus Premium: With 12 Practice Tests... by David Bock M.S.
6% also reviewed:
The Maze Runner: Maze Runner, Book 1 by James Dashner
4% also reviewed:
5 Steps to a 5 AP Chemistry 2016 (5 Steps to a 5... by John Moore
4% also reviewed:
Elmer's White Glue.1 Gallon Bottle, 128 Fl Oz by Elmer's
4% also reviewed:
WXBUY Women's Oversized Metal Rivet Eyeglasses... by WXBUY
4% also reviewed:
Texas Instruments TI84PLSCEBLUBRY Graphing... by Texas Instruments
from the same brand
18 of the 54 reviewers have substantial overlapping product review history. These reviewers have rated this product an average of 4.6 while the reviewers who have a more unique product review history rated this product an average of 3.9. Based on our statistical modeling, the discrepancy in average rating between these two groups is significant enough to believe that the difference is not due to random chance, and may indicate that there are unnatural reviews.
-
- 6%
- Created over 1 day
We counted 54 reviews for this product over the span of 731 days, an average of 0.1 reviews per day. If these reviews were created randomly, there would be a 99.9% chance that we would see 2 or fewer reviews on any given day.
However, we see the following 1 day exceeding this threshold:In total, we found that 3 reviews were created on just 1 day. Although any days with a larger number of reviews than expected is suspicious, the discrepancy in ratings from reviews created on these high volume days and reviews created on other days isn't significant enough to rule out the possibility of it being due to random chance.
Brand Loyalists
2 of the 54 reviewers have reviewed multiple products but half or more of their reviews are for this brand. While this is more Brand Loyalists than we'd expect to see, it does not appear to have a significant impact on the overall rating.
Take-Back Reviewers
23 of the 54 reviewers have had at least one of their past reviews for another product deleted. While this is more Take-Back Reviewers than we'd expect to see, the discrepancy in ratings between the Take-Back Reviewers and reviewers who don't have any deleted reviews in their history isn't significant enough to rule out the possibility of it being due to random chance.
-
- 54%
- From reviewers with an overrepresented participation
We see the following 2 participation groups with a statistically significant greater concentration than what we'd expect to see:In total, we found that 29 reviewers (or 54%) are within an overrepresented participation group. This is an excessively high number of reviewers in overrepresented participation groups.
6 of the 54 total reviews for this product are unverified purchases. This is within an acceptable range and it does not appear to be significantly affecting the overall rating for this product.
Unverified purchases may be the result of Kindle Unlimited readers, buyers who didn't pay full price, or reviewers who did not purchase the product at Amazon. Read more about our Unverified Purchases test.
(3.5/5)
(4.5/5)
(3.0/5)
3 of the 54 total reviews for this product use substantial repetitive phrases between them. This is within an acceptable range and it does not appear to be significantly affecting the overall rating for this product.
4.2 Product's Average Ease Score
4.3 Category's Average Ease Score
Read more about our Reviewer Ease test.
-
- 0%
- Admitted to receiving an incentive
Read more about our Incentivized Reviews test. Check out our study showing that Incentivized Reviewers are much more likely to leave a positive review.