I will keep this review simple. Took this class while working a day job during the Covid pandemic. So I might have a different perspective than others.

1. She gives daily homeworks with tight deadlines. That might sound easy to follow, but it isn't. I missed almost half of her homeworks. Of those I missed, half were because she posts them both at Gradescope and CCLE. What clarity. Also those freaking participation quizes... While my other classes have once a week homeworks with scheduled deadlines, her class was a mess.

2. She has annoying rules and mark schemes. She will take points off your work for the most annoying reasons. If you're someone who takes classes extremely seriously, fine, you'll succeed in her class. If you might have other things going on in your life, and just want to learn statistics, don't take this class.

3. She makes the textbook she wrote to be the class textbook, so she'll make money off of it. The worst thing is, she cannot express herself clearly. With statistics, most questions are long convoluted. Her questions are often ambiguous and she insist on making her own questions. If you didn't understand it, too bad, you'll get no points because of her mark scheme is strict down to the last symbol.

Professor Sanchez was...a lot. She was not too bad she was manageable but I am not sure if that was because this class was online or just her regularly. You are forced to buy her textbook and a cognella quiz thing to take some chapter quizzes but this thing looks EXACTLY like ccle!! AND its mostly extra credit other than like 3 or so that are graded! Which I thought was a waste of money honestly but no matter. Her teaching was not too bad, she had slides and sort of went through it, you really have to read the book to get a good understanding though, a lot of these questions on homeworks and exams require some sort of practice. Her exams were not too bad either, except that for the first midterm she tested on material that we had literally learned the lecture prior. She is a very kind lady but she is also not the best so just keep that in mind

My grade isn't reflective of how heavy the workload for this class is. I am an individual who is super passionate about statistics so keep that in mind as you read this review.

- Her lectures were very intense because she had this whole ritual of pre-lecture readings with post-lecture slides to review for HWs, Quizzes, Exams.
- We had about 15 HWs through the quarter (so more than 1 per week) and they would take a while, especially if you were not engaged during lectures (which is entirely possible).
- Participation quizzes accounted for 25% of your grade...not bad right? They were a pain to answer because every lecture had a quiz you had to finish, a few had like 20 Qs (idk why she didn't just call those HWs).
- Midterm and Final were timed, which isn't a problem because frankly I prefer that, and her questions were fair and not impossible. Our distributions were how you'd expect them to be for a stats class with this large of a syllabus for 10 weeks.
- She did offer EC opportunities but those were in the form of more quizzes, which I was done with and did not attempt (to be exact I attempted 20% of ONE quiz out of 10).
- Her grading scale was that you needed a 95% for an A, so if you were not on top of your game from Day 1, you're likely going to heavily depend on a thick curve for one of the tests.

Finally,
Take this class if you have to, its not unbearable if you are passionate about stats and need it as a prereq for more computational upper-divs. But if this class is one of four, maybe five classes in the quarter and you just want to explore the field...hold it off for the next quarter.

Maybe I killed someone in my preexistence, and she was sent by Jesus to make me atone. I don't know what to say about her. Seriously, DON'T TAKE HER CLASS. I don't think there is any language in the world that can descript how bad her class is. Her homework is 100 times more difficult than climbing Mount Everest, I'd rather feed the pigs in some kind of yields. Her exams are one of the top 3 tortures in the United States, and the rests are the hw and watch her class video. She requires an attendance quiz. If your answers are wrong, you get 0 on participation. How should people suppose to know what she is saying with her horrible handwriting and get the quiz answers correct? And she doesn't do curve.

Juana Sanchez is a really good professor, you just have to be polite and make her feel that you are involved in the class. Her exams are pretty long but the questions are not that hard. She provides very clear and concise study notes and the homework are helpful for the midterms and final. Some people complain that she gives them anxiety but don't take her too seriously, she is not mean, she just wants everyone to study the minimum required. She is actually pretty helpful in office hours, so don't hesitate to go and see her to ask questions about the class or homework. The material of the class is very interesting and really not that difficult overall.

Well in short, if you want stressful and hard class to pass or get good grade then this is your professor.

I am taking STATS 100A with Prof Jauna Sanchez over Summer 2020. She made it compulsory for us to dump $95 to buy the book 'Probability for Data Scientists' written by guess who? Herself, Juana Sanchez. The book has online content just to make sure that you absolutely have to buy a new one. And then she also gave us the spiel on the importance of copyrights and that the university takes copyright infringement seriously.
I respect authors and their rights to their intellectual property. However, making it compulsory for your students to buy an expensive book that you yourself wrote, at a time when the university administration has been pushing for professors to offer classes that either do not require a compulsory textbook or have a lower-cost alternative. And then being self-righteous is just ridiculous.
I would have dropped the class if I had the slightest option to delay taking STATS 100A any longer.
I'm sure the other reviews are already convincing enough on why you shouldn't take this class. But if you need another reason, here it is. So unless you absolutely have to take this class, I'd suggest finding an alternative.

Coming from someone who didn't perform super well in this class but still passed, overall I would say I wouldn't recommend the class but it definitely didn't end up being as nightmarish as reviews stipulated and there are a few Reddit posts to corroborate this opinion.

The workload was significant but not over the top - a homework packet of 5-9 questions each week (most but not all a/b/c/d, sometimes to h) and usually assignments to turn in the next day in lecture (you have to check CCLE because sometimes she didn't remind us to do it). Sometimes gives pop quizzes in the middle of the lecture (off her powerpoint point slides she would have an example of the day's topic for us to work on and hand in our work, but only once or twice did she grade on correctness. It was more like participation even if wrong). That's about it for work; one midterm is multiple choice, the second is free response, and the final was mostly multiple choice with a little free response. Warning that she never gave enough time so you have to work fast. Sometimes she got rid of questions after realizing how long the tests were though.

Her exams are open note - first midterm we were allowed one page of formulas, second midterm and final were open notebook. Don't be fooled though, you barely have enough time to glance at notes so it's not super helpful unless you already know everything.

The good thing I noticed about the class that I was surprised about is how nice and available she usually was. She holds a lot of office hours and doesn't make you feel stupid for asking simple questions, and we usually had a lot of them because her lectures are way too fast. But another thing is that she records all her lectures and posts them online so I usually went back to watch them.

The complaints that she takes attendance every lecture for participation, and the complaints of her exam rituals are fairly accurate - she seemed obsessed with cheating and had us take lots of precautions for every test. She did in fact have a lot of typos in lecture notes and even in her textbook so hopefully your lecture will have a smart person to call them out.

Summary: If you ask lots of questions/don't fall behind like I did, you will be ok! There did end up being a big curve at the end of the class. Medium-to-slightly heavy workload with medium-to-difficult material - very light math 32B and no 33A. First half of class without any calculus even seemed harder for the class than the calculus bit.

Horrible horrible class. I had crippling anxiety and walking into this class tipped me over the edge. Her homeworks are overload and are carelessly created (full of mistakes and unclear directions) -- however because of this she is lenient on the grading. The group "quizzes" she assigned took an entire weekends worth of time and she ended up handing out A's to everyone that completed it.

Contradicts herself a lot during lecture and has an attitude. For example in the beg of the quarter she would get mad at people who would just listen to her instead of taking notes, and she said "What are you guys doing? You guys should be typing and not just listening... you need to turn this in. Please get busy". Later on during the quarter when we are typing what she's typing, she yells "Can you guys please stop typing. Just listen.".

Always lets us out late -- this is a problem because she opens up submission forms for in class participation activities when class is supposed to be dismissed and she talks about the weekends homework assignment after the class is supposed to end.... always end up being 5 minutes late to my next class.

Last thing: Grading is very inconsistent. First 3 or so quizzes were grader rather rigorously. Average was a C, but towards the end the quiz averages were 90-95. Not sure whether this class was curved or raw scored, but if it was curved, this method makes it impossible to beat the class average and better your grade especially if you got off to a poor start.

Tips for prof: End class on time and make more manageable homeworks. Also keep grading consistent please.

Professor Sanchez was a real pain in my ass this quarter and I honestly regret taking this class with her even though I did alright. Her lectures almost always went overtime and would be full of participation quizzes that you would have to do on your own time before next class if she didn't get to them and her homework assignments were full of dumb technicalities that weren't even relevant to the course content that you had to make sure to follow if you didn't want to get a 0. The class itself wasn't that difficult (especially if you had taken a statistics class in high school or community college) but some of the assignments could be pretty long (in particular the ones that she assigned over Thanksgiving break and the week of the final). My advice would be to take this class with a competent professor that is reasonable about the workload and the grading and if you absolutely have to take this class then be prepared to do a lot of extra work. Oh, and don't waste $95 on the textbook--you can find it online for free.