Motor Mouth (Alex Barnaby Series #2)
From HarperCollins
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Most Trusted Reviews
TRUST
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Verified Purchaser
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Overlapping Review History: reviewed 3 of 9 top products
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Easy Grader (avg. rating: 4.8)
Least Trusted Reviews
TRUST
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Unverified Purchaser
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Contains repetitive phrases (
show)
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Never-Verified Reviewer
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Overrepresented Participation (posted 10 reviews)
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Easy Grader (avg. rating: 4.3)
Analysis Details

144 of the 260 total reviews for this product are unverified purchases. The unverified purchasers have rated this product an average of 3.4 while the verified purchasers have rated this product an average of 4.4. 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.
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.

Take-Back Reviewers
23 of the 260 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, it does not appear to have a significant impact on the overall rating.
Single-Day Reviewers
4 of the 260 reviewers have written multiple reviews but posted all of them on a single day. The Single-Day reviewers have rated this product an average of 5.0 while all other reviewers rated this product an average of 3.8. 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.

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- 28%
- 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 1 group with a statistically significant greater concentration than what we'd expect to see:In total, we found that 72 reviews (or 28%) are within an overrepresented word count group. These reviews have rated this product an average of 4.2, while all other reviews have rated this product an average of 3.7. 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.

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- 5%
- Created over 4 days
We counted 260 reviews for this product over the span of 3,965 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 4 days exceeding this threshold:In total, we found that 14 reviews were created on just 4 days. Although any days with a larger number of reviews than expected is suspicious, these reviews do not appear to have a significant impact on the overall rating.

4.2 Product's Average Ease Score
4.2 Category's Average Ease Score
Read more about our Reviewer Ease test.

66 of the 260 total reviews for this product use substantial repetitive phrases between them. This is an excessively large percentage which may indicate unnatural reviews.

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- 75%
- From reviewers with an overrepresented participation
We see the following 3 participation groups with a statistically significant greater concentration than what we'd expect to see:In total, we found that 194 reviewers (or 75%) are within an overrepresented participation group. This is an excessively high number of reviewers in overrepresented participation groups.

9% also reviewed:
Takedown Twenty (Stephanie Plum) by Evanovich, Janet
9% also reviewed:
Twelve Sharp (Stephanie Plum, No. 12) (Stephanie... by Janet Evanovich
8% also reviewed:
Fearless Fourteen by St. Martin's Press
8% also reviewed:
Notorious Nineteen: A Stephanie Plum Novel by Evanovich, Janet
8% also reviewed:
Wicked Business: A Lizzy and Diesel Novel (Lizzy... by Janet Evanovich
7% also reviewed:
Eleven on Top (Stephanie Plum Novels) by Janet Evanovich
7% also reviewed:
Finger Lickin' Fifteen (A Stephanie Plum Novel)... by Janet Evanovich
7% also reviewed:
Wicked Appetite (Lizzy and Diesel) by St. Martin's Press
7% also reviewed:
Top Secret Twenty-One (Stephanie Plum) by Evanovich, Janet
88 of the 260 reviewers have substantial overlapping product review history. This is within an acceptable range and it does not appear to be significantly affecting the overall rating for this product.

Brand Repeaters
13 of the 260 reviewers have reviewed other products for this brand. This is within an acceptable range and it does not appear to be significantly affecting the overall rating for this product.

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- 0%
- Admitted to receiving an incentive
Read more about our Incentivized Reviews test, or check out our study showing that Incentivized Reviewers are much more likely to leave a positive review.

- 0
- Reviews have been deleted
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.