# homework

1. ### Probability Question

Hello I am reviewing one of my exams for my final and am very confused when it comes to this question; The probability that at least one of the two chosen patients are less than 35 years old? Given: the sample size is 100. 43/100 of the patients are less than 35 and they are drawn at random...
2. ### Probability Question (Ambiguous)

SOLVED BY MYSELF, YOU CAN CLOSE THE THREAD :) Hi guys, I'm new to this forum, and some of you might find it annoying that I post a question straight off, but the assignment is due tomorrow and I have two different answers. I do promise to keep posting in threads (when I have something to say)...
3. ### Model selection for logistic regression, comparing p-value approach, BIC and CV.

Hi, I need to write a discussion on three approaches of model selection; p-value, Bayes factors (using BIC) and leave-one-out cross validation. The p-value is not preferred, statiscal significance depends on sample size, p-value is based on imaginary data, depends on the intentions of the...

Hey Guys I kind of need help with these questions would really appreciate it 1.)When the assumption of sphericity is violated, correction procedures such as Greenhouse-Geisser... Select one: a. adjust the SS(between) value b. adjust the SS(within) value c. make it less likely that my F...

Hey Guys I kind of need help with these questions would really appreciate it 1.)When the assumption of sphericity is violated, correction procedures such as Greenhouse-Geisser... Select one: a. adjust the SS(between) value b. adjust the SS(within) value c. make it less likely that my F...
6. ### Stats homework Help

Hey Guys I kind of need help with these questions:) would really appreciate it:) 1.)When the assumption of sphericity is violated, correction procedures such as Greenhouse-Geisser... Select one: a. adjust the SS(between) value b. adjust the SS(within) value c. make it less likely that...

I'm having problems mostly with part (b) and (c). Please add every single step and side note you can - including formulas used. I greatly appreciate the help! A company purchases large shipments of lemons and uses this acceptance smaplong plan: randomly select and test 200 lemons, than accept...
8. ### Normal Approximation to the Binomial Distribution Help Needed

SOLVED - Normal Approximation to the Binomial Distribution Help Needed A multiple choice test consists of a series of questions, each with four possible choices. a) If there are 60 questions, estimate the probability that a student guessing blindly on each question will get at least 30 right...
9. ### Help please, maximizing function w/respect to one x variable

OK, so I'm working on this hw assignment (I'm a grad student, and for this class this is for knowledge, not points). We were given a large data set to regress in Stata. I've got the regression and first several questions done. Now, they want us to find the optimal x4 value (I have about 8 x...
10. ### permutations and confidence intervals

Hello! I am in need of a little guidance on a stat problem... I've performed a permutation on two data sets, in R, regarding sunblock efficacy, and have concluded that in any permutation, there is only one instance of matching efficacy, the original data set. now I have to find a 95% C.I...
11. ### residuals for Beta's as shown hw

I need to interpret a residual table which was fitted by y_.0123 (final residual) against the x_1.023. The table represents residuals produced by each variable. # data pts value of Y Bo B1 B2 B3 212 small small small small small 14 small small large small small 10...
12. ### two way analysis

I have data for 1970 and 1980 parity ratios, Parity 0 1 2 3 4 5 British 0.879 0.797 0.558 0.484 0.480 0.531 Cubans 0.939 0.920 0.818 0.796 0.789 0.774 Blacks 0.748 0.778 0.787 0.789 0.774 0.759 Parity 0 1 2 3 4 5 British 0.929 0.882 0.646 0.531 0.476 0.496 Cubans 0.961...
13. ### Standard deviations related question...help?

Q. A school social worker is determining eligibility for anxiety management groups at a high school she is employed at. If she is interested in identifying the percentage of potential clients who scored higher than 1.5 standard deviations above the mean on a standardized anxiety index, for the...
14. ### Hypothesis Testing

Hi all, I've got an MCQ question for uni that I'm not sure how to go about :confused:. If anyone could point me in the right direction that would be fantastic. "A university administrator believes that less than 40% of full-time staff regularly use public transport to travel to the...
15. ### Standard Normal random variable problem: I have no idea on how to start...

Assume X is a standard normal random and Y ~ N(0,9). What is the 97.5 percentile of p(X) and p(Y)?
16. ### A random variable that is a mix of discrete and continuous

Here's a question we got for homework: It is given that at a certain bank there's 50-50 chance that when you enter there's: - no one waiting in line - there's one man waiting, in which case the waiting time is exponentially distributed. What is the CDF of the total waiting...
17. ### Probability of getting different results when tossing a coin

Here's a question I got for homework: Here's what I have so far: In every round (time unit) the possible results and so Which means we're dealing with a geometric distribution. What doesn't feel right is that the question mentions 'discrete time units'. That makes me think about a...
18. ### Stats Homework HELP!

EDIT: How can I show effort when I literally have no idea where to start? I am desperate to understand this. I have read the requirements for homework help. I am failing this class. I am taking the class online and have emailed my professor numerous times and have never received a reply. I have...
19. ### method of maximum likelihood

Hi, i know this is a long question but help would be greatly appreciated as ive no idea where to start, here it is: Let x1, x2, . . . , xn be an iid sample from a Gamma distribution with known shape parameter α and scale parameter β = 1/σ. . (a) Derive an estimate of σ using method of maximum...