Influence of online adult fiction book reviews to the book sales and popularity

I am Kristina Grybaitė, a New Media Language second-year student at the Kaunas University of Technology. The data conducted from this survey will be used researching the influence of online adult fiction book reviews to the book sales and popularity. The research is aimed to analyze the reviews published on news media channels online, such as BBC and Publishers Weekly.
Participation is voluntary and anonymous, answers are private. Participants can withdraw themselves from the research at any time without a valid reason. 
For contacting me via email: [email protected]
Thank you for your participation!

Provide your insights regarding this survey
The cover letter is informative and contains the most important parts of a cover letter. In the question on age, your age intervals overlap. I would advise to change the question "Which reviews you read more frequently?" as before you start reading a review it does not always clear if it is going to be a positive or a negative one. You could have tried using a bigger variety of question types and formats. Other than that, this was a good attempt to create an Internet survey!
Sadly, the topic is not relevant to me, but I find this survey quite interesting. The cover letter is also great. Good luck!
I liked the cover letter, there as as much information as it needs to be in it. I just think that there could have been some questions where I could write my own opinion, not only to answer yes or no.
The cover letter is very sophisticated. Maybe there could be something that would encourage more to complete the survey. One more thing that could be improved is that at first, there are options for those who don't read reviews, but later you can only answer the questions if you read them. All in all, they survey is cool ;)