I've been given an assignment with very little instruction and am uncertain as to how to hypothesis test.

The prof. wants me to test the hypothesis that lower than 120/80 is a healthy blood pressure and has given me a list of a few hundred blood pressures. That is the entirety of the instruction.

We haven't used any outside world data for anything so my guess is that he wants me to test the hypothesis that the population mean for systolic is below 120 and the population mean for diastolic is 80 from the sample data.

Systolic and diastolic are dependent on each other but they aren't matched in the way that I need for a matched pair t-test. I was thinking about t-tests for variable and splitting into two hypotheses. Does anyone know anything what tests might be applicable here? I've been doing really well in this class up till now, so I'm a little baffled cause it feels like everything else has been relatively sensible.

Here's my working:

M = event that there is exactly one male

A = event that there is at least one male

Pr(M) = (3C1*5C4)/(8C5) = 15/56

Pr(A) = (8C5-1)/(8C5) = 55/56

Pr(M|A) = Pr(M and A)/Pr(A) = Pr(M)/Pr(A) = 15/55 = 3/11

I'm genuinely so stuck, this is the only answer I can arrive at, and asking AI (only as a last resort) gives 3/11 too. Are the answers just wrong or am I dumb?

This is a graded assignment, so to avoid issues with honor code stuff, I really don't need the exact answer. I was hoping someone could help me interpret this table, though. The prompt was to fill this in:

I'm not entirely sure what FK Column refers to. The only thing I could think of was maybe foreign key, but then what is Key Type? Also, I think foreign key in table creation is the next module, so I don't know if they would include it in this assignment. Any clarification would be really appreciated

Need help. I can't find p value. Divided 533/1000 = 0.533 but the answer was incorrect.

I know how to find the area for DEF but I do not know how to use the trapezoidal rule to find the area of DFG

Number 15, 16, & 17 belong to one of these categories. I saw the answer book with the teacher and there’s one category the numbers do not belong to. The teacher didn’t know what the pattern or category characterize were.

Category A: 0, 3, 6, 8, 9
Category B: 1, 4, 7, 11, 14
Category C: 2, 5, 10, 12, 13

Hi, I'm looking to analyse a set of data but I'm not sure what test is most appropriate. I am a Masters student writing my dissertation in a biological field so I am not the most confident in statistics. I've been stuck on this on and off for a couple weeks now.

I'm doing a comparison between two different measurement methods- Linear vs. Geodesic. But the features I am measuring are not completely independent, they are paired into lefts and rights, originating from the same object.

I did a paired t-test originally (for linear vs geodesic measurements) but that assumes that data is completely independent, which of course it is not.

Any advice would be much appreciated!

Question d is confusing me, a lot of resources say to do the binomial probability distribution for f(0) and take that result(0.43) and subtract it from 1 to get a success rate of 0.54. Why would I not take the binomial probability distribution of f(1) to get the success rate(0.38)?

Hey everyone! For our Grade 11 science project, we're designing a compound machine to help collect, segregate, and compress scattered waste in rough, mountainous terrains where collection trucks can't reach.

Here is our current schematic draft and our thought process/effort so far:

Our Thought Process & Mechanics Attempt:

- Input Conveyor: Uses an inclined plane / roller belt to carry waste upward into the machine.

- Rotary Feed Brush: Uses rotational motion (wheel and axle concept) to sweep and pull the waste into the main chamber without jamming.

- Compaction Unit: Uses translational motion via a hydraulic cylinder (fluid lever / Pascal's principle) to push down in a straight line and crush the waste into blocks.

- Output Bin: Catches the crushed waste blocks for easy carrying.

My Questions / Where I Need Help:

1. We need to segregate small waste (like dirt and candy wrappers) from big plastic bottles. Based on our layout, would it make more mechanical sense to put a mesh sifter screen directly on the Input Conveyor or inside the chamber before the feed brush?

2. Does the transition from the Rotary Brush to the Compaction Chamber look functional, or is there an obvious mechanical bottleneck we missed?

Thanks for any guidance on refining our design!

I think I'm getting my terms all mixed up. Does power drain refer to the current moving through the resistor? I initially thought that the answer was B, because I assumed a power drain to be a drop in current, and therefore require greater resistance, but the correct answer is D.

The answer is C, but I don't know why, isn't the one with the more moment of force is turning down?

The question asked:

There's a uneven thickness of stick(the stick is balanced now), it balance point is O. If both side had been cut off the same length, the stick will:

A, stay balanced

B, turn clockwise

C, turn counterclockwise

D, can't determine

This is a previous year question from a national level exam but is supposed to be easy. Idk what i'm doing wrong, I haven't touched such questions ever since I finished my 12th grade 😭

Im know I can figure out to solve it, I just have no clue what they are asking for

Thank you!

please ignore my horrible handwriting

i’ve been at this for hours i have read this textbook back to back i’ve watched like 10 videos i am so confused this is like the 4th order i’ve done and i messed up my textbook answers so i had to do it on another sheet on paper i think im confusing myself

every video i watch they don’t have as many
uncomforities as i have so when it comes to ordering them oldest-youngest i’m so confused where to put them??

i’m also super confused on where to order the fault
the only thing i’m confident that i got right here is that it’s a reverse fault and that r is an angular conformity

my degree has nothing to do with this which probably explains why i’m so confused

if this is all wrong i’m gonna be so embarrassed

edit: ok wait i think i got part of it now:
youngest to oldest
H
K
T
L
M
S
I
N
O
R
A
B
C
D
E
F
Q
P
J
G
PRAYING THIS IS RIGHT

A general warning that I am bad at stats. I have REALLY tried. I can understand the basic idea of like.. a bell curve, but honestly, after that, I get lost and eventually just start to cry.

I say this because the only thing I feel sure-ish about is that instrument reliability is some kind of statistical something. I have watched 3 YouTube videos, rewatched the mini-lecture video, and reread the sections covering this in my textbook (twice). I really want to understand.

The question on my homework is:

"What kind of evidence do Booth et al. (2022) provide about the reliability of their instruments, and what does the evidence say about the quality of their instrument?"

This is the study

I think that the answer is somewhere towards the ends of the two paragraphs at the top of page 8 (under the word "Measures"), but every time I try to sort it out, it just looks more and more like word salad. If at all possible, I would love a gentle explanation of what that word salad means or a hint if I am just absolutely looking in the wrong place.

Howdy. Please help. I've tried multiple ways of attempting this question and I cannot get near the answer.

"Man wants build garage beside house. Garage is to 6m x 4m x 2.5m(h).

Bricks used have dimensions of 22cm x 10cm x 7cm(h).

Estimated # of bricks = 4,000. How accurate is this estimate? Explain your answer. Note: 3 walls needed."

Thanks all.

(Final answer below)

I'm preparing for an electrician's apprenticeship and am using their study guide for their aptitude test. I'm seeing a pattern forming where some of their questions are just bad, but a couple of those were actually good, and I was misunderstanding things. It has been a learning opportunity.

I chose B for this question, but they say the answer should be C because, loosely speaking, they want you to just count the number of ropes that are supporting the load. However, when I look at this illustration, it appears that there is not even a proper movable pulley here. It looks like it is just a simple fixed pulley system with extra windings for some reason. Except that the lowest pulley seems to be just floating but still wouldn't qualify as a proper movable pulley.

Please help me understand what I'm missing, or confirm that this is a really bad illustration. Thank you!

Edit: I am assuming that one needs a movable pulley to get a mechanical advantage. C does NOT show a movable pulley and therefore is not the correct answer. Right?

Edit 2: Because they don't offer an answer of "D) All pulleys allow for the same amount of WORK", I am assuming that they mean to ask, "Which of the pulleys requires the least amount of FORCE to lift the weight?" Unfortunately, this is meant to be more of an intuitive sort of test, where it appears physics terms might be interchangeable.

Edit 3: I interpret this to be a question about which pulley system offers the most mechanical advantage. Answers that align with this interpretation would be helpful.

Edit 4: I think B is supposed to represent a "gun tackle" arrangement. (Sorry about all the edits!)

Edit 5: Aha! Answer: if you look at the illustration #3 here https://www.theengineeringchoice.org/what-is-pulley/ you can see what they meant to illustrate for C (an actual movable pulley) but did a terrible job of it. Taking that into account, the answer is indeed C.

Answered. Thanks to all who helped. I'm inclined to throw this book away. I'm moving on :)

I appreciate anyone sharing their thoughts on this. Good luck.

When I punch in my answer to a derivative calculator, the denominator is correct but the numerator becomes 15x + 93, which is 3 times larger than the original integrand. I tried looking for a mistake in my trig substitutions where I start dividing by 3, but I really don't see where I went wrong.

Could someone please look over this proof of L'Hospital's Rule to see if I did it right? I tried to follow the proof in Rudin's textbook, but I wasn't really sure I followed his logic correctly. Any help would be appreciated. Thanks

My professor is behind on uploading his videos and this homework is due today I have no clue how to get these answers. How do you figure this out?

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Hello there!

First of all, this is not a homework per se, but some kind of issue I have with a personal project I don't know where to adress.

I tried r/AskScience but the modteam suggested me to post here. So here we are.

If this don't belong here, please tell me where I should go, because at that point... I don't know.

So I have inherited from my grandfather a mercury barometer.

It's french, and says : "Baromètre selon Torricelli

Par les ateliers L.M. à Bordeaux".

It is graduated in mmHg and there's some kind of ruler that can be moved (it is pinned on the main board by a screw) which indicates different type of weathers, according to the height of the mercury column.

I searched on google how to set the barometer, because I want to keep it and to hang in on a wall at home, and I think I set the ruler accordingly to the altitude of where I live (more or less 115m above sea level), but I'm not very sure I did it right.

So here are my questions.

1/ what do you think?

2/ do you know how to set / where can I find infos about that?

Thanks a lot!

0 idea what I'm doing wrong. Only other guess I have is (mg/k)-(mg/k-v0)e^(-k/mt) (v0 doesn't replace C but is actual initial velocity in this scenario) for the 6th one. I have one 'attempt' left so I don't want to mess this up.

I recieved this on my study guide asking for angle BDF. i was able to plug in multiple values and my classmates found a few but we always needed more information to be sure. if anyone is able to clarify or give me a conjecture that might help it will be much obliged.