I'm impressed how the professor can make such an easy class a nightmare for everyone. Strict class rules; Attendance for classes that you learn nothing from; weekly homework (normally 5 pages) and weekly online quiz (at least 30 questions). 6 weeks in and I haven't learnt anything from her. Exams are alright but you need a 95% overall to get an A so yeah it can be tough.
Anyway avoid her at all cost, or you will probably end up writing another comment above me.

By far the worst professor I've ever had at UCLA. Her lectures are unorganized, her examples don't teach you anything, and she rambles in such a way that makes it very hard to follow along. She is also very strict and makes her lecture seem like a bad high school class. She takes attendance everyday and sometimes gives us handouts 5 minutes before the lecture ends that we have to turn in for credit. Thankfully, the material in Stats 100A is very easy and you can get by just fine, but her class is raw scored so you'll probably still get a B unless you try super hard. The homework was not that hard, but did take really long and based off problems in her terribly written textbook. Instead of having one section of problems per chapter like a normal person, she has problems after every subsection. So a HW assignment will be something like: Section 8.3.2 2,4,7, Sec 8.5.4 6,9, Sec 8.7.1 3,5 etc... very confusing. Also for each HW expect to find one or two typos or for her to randomly introduce a variable that's never appeared before that makes the problem unsolvable. You should definitely not spend $70 on her textbook and download it here instead (https://tinyurl.com/qlr3d22). Midterm and Final weren't that bad, but she's really spiteful and had questions about the syllabus on them because she was tired of students asking her about it. I literally lost more points on those questions than on the actual problems about stats.

I can't see why so many people say she is bad. She is fine and I really like her handouts, they are so clear and really helpful. Her class is not easy mostly because the grading system is pretty strict. You need to get 95 or 96 to get an A. That means you can't make any stupid mistakes during the tests, and finish the test fast enough. There is written homework and online homework. Written one is easy, online one is much harder but really really helpful. She prints all the teaching materials for you, these materials are really informative and in detail, so you don't have to use textbook.

If I didn't take this class asynchronously, I definitely would have dropped it. professor sanchez is very disorganized, and her directions for some of the homeworks use so many words for no reason. She says so much without saying anything. There is a lot of work, which I was luckily able to finesse since I took it online, but I don't get how in-person classes would manage this class with other engineering classes.

*It has arguably been one of the least well-organized courses I've taken at UCLA, and the instructor seems to hold very high standard for her students, but a very low standard for herself.*
I do believe the instructor cares about her students, but the overall organization of her class does not reflect that well. Being an asynchronous class, there are a lot of readings involved, and it was particularly challenging and confusing for this class because of the typos and misinformations spread all throughout the announcements, homework questions, lecture slides, and more. The textbook itself, which was *required* for this class, also has very similar typos and misinformations sprinkled across its content, but that's not even the worst - the most confusing part is how the textbook doesn't provide nearly enough practices *with solutions and explanations*. Textbooks are not nearly as helpful when they only present questions but doesn't provide any answers or solutions, it only stresses students out more, especially when the answers provided are also wrong way too often. Another note about the textbook is that it doesn't have a table of content and is hard to use, it gets frustrating when I realized that we are only required to use this particular textbook because she wrote it - she does reference to the textbook a lot in lecture and exams, *without* specifying any details, so you have to go find the specific question in the very poorly organized textbook.
Dr. Sanchez seems to emphasize her rules very heavily, expects people to follow them strictly and is very non-lenient, but she makes these rules unnecessarily hard to follow and does not seem to care about the struggles: for example, homework regrades are due within 2 days of being graded, but she never announces when they are graded, *and* in almost every single homework assignment she had major grading mistakes that were pointed out by students. You would need to check very often and still might miss her regrade deadlines sometimes, it's stressful. She also tells us to ask questions but has ignored at least 4 of my emails throughout the quarter. She only allocates an hour of office hours a week and did not discuss when is the best time to meet for most students. Overall, my experience in this class has been bad, as I feel more confused, stressed out, and discouraged than anything else. The course content is easy as this is an intro to statistics class, however everything I learned was largely learned by myself outside of her confusing textbook/lectures - if anything her instructions stressed me out and made it so much harder and more painful to learn these fun topics. It has arguably been one of the least well-organized courses I've taken at UCLA, and the instructor seems to hold very high standard for her students, but a very low standard for herself.

Writing this review early as a bloody handprint on the wall to anyone else who is considering taking this class with this professor. Needed STATS 100A for my major and saw that there was an asynchronous section available. Read the reviews on Bruinwalk, did not look too good. But it's async, and I'm pretty familiar with stats anyways so how bad could it be? WORST MISTAKE EVER. Thought the reviews were exaggerating, but no, (unfortunately this is the only way to put it) DR. SANCHEZ MAY ACTUALLY BE SENILE. From the lecture videos I did watch, she consistently makes mistakes almost every 5 minutes just to double back and leave the viewer constantly flabbergasted. She makes you pay for a textbook that she wrote, which is equally as disorganized as her lectures. Then she only references her own textbook in the lectures, so you're basically trapped in that echo chamber. You will seriously be able to learn more from a 5-minute glance at a Wikipedia page on the topic than watching her lecture. Her inability to lecture isn't even the worst part though, and I would honestly be able to overlook it if not for her completely illogical assignments. She uses something called Cognella for biweekly homework quizzes that will take you about 45 minutes to 2 hours to do, not because they are intellectually challenging questions that make you apply the concepts you learn, but because they are CONSISTENTLY FILLED WITH TYPOS AND MISTAKES. She writes the questions herself, so you either have questions that will have you running through every possible typo she could have made and computing answers based on those outcomes, or solving the statistics equivalent of the Zodiac Cipher written in what is barely passable English (or any language, for that matter). Sometimes the questions are free response questions where you have to show work, and you have to submit a LaTeX pdf for EACH QUESTION. I'm taking 5 classes this quarter so I gave up trying on these and just took the L (be prepared to basically get an 80% or lower on every quiz). The midterm was just a longer version of the Cognella quizzes, and I'm assuming the final will be too. Her official "homework" assignments (yes, there's more) are a little better formatted and you do them with a group, but are graded (like most things with this professor) completely illogically. One of the assignments was to comb through a 400 entry student-collected spreadsheet, and point out individual biases or errors that existed. She then proceeded to mark down every flaw that you missed (and another group spotted). I kid you not, in our campus survey spreadsheet, she marked us down because we didn't notice that "The sample contains mostly observations from South and central campus, which makes it not very representative of the whole campus." IN 400 ENTRIES. I don't even need to mention that there is no rubric for these, because WHY WOULD THERE BE? The rubric is whatever Dr. Sanchez is feeling that day. And ALL OF THIS would be forgivable, ALL, if her grading scale wasn't absolutely atrocious. It's an absolute scale, where 95%, yes, 95%, is the cutoff for an A. She also doesn't curve any tests, if that's what you were hoping for.

Quite literally the worst experience I have had taking a class here. I'm assuming I'll get a B+ or A-, and I went into this class already with a very strong knowledge of the material covered. The difference between an A- and an A is not mastery of the material, it's your ability and time to deal with bullshit. The material isn't that hard, so if you are willing to commit about 10-15 hours of outside work a week to this class, you can probably get an A. Otherwise, stay clear. Stay very clear.

As a closing remark and TLDR,
DO NOT TAKE THIS CLASS. THERE IS NOTHING FOR YOU HERE. TURN BACK NOW.

The tests and homeworks are definitely on the harder side, and watching or attending her lectures is a must if you want to do well in the course. I found that the time limit was also a bit on the short side because of how many questions the tests have given the time frame. But, one of the biggest pros of this course is how much the tests are curved. In addition to that, there is a group test and EC opportunities available to further help your grade. Because of this, approximately 50% of students in this course will get an A/A+/A-.

Every single assignment and communication from the professor is a giant, rambling wall of text. Every single homework and exam had typos, often there were multiple choice questions with no correct answer.

I wouldn't say the class is super hard but it is definitely extremely frustrating.

Fall 2022
Just avoid the class, no matter what. She's not very good at teaching and her lectures are extremely unclear. She's inconsistent when it comes to assignments both in format and due dates. Unless this is your ONLY class the amount of pre-class studying she asks you to do is absurd.

You have to buy prof. Sanchez's own software to do all the homework assignments, a lot of her questions on tests / homework are wrong or have typos. Easy class though especially if you're asynchronous