homework

  1. A

    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. C

    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. S

    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...
  4. K

    please help me:) appreciate it

    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...
  5. K

    please help me

    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. K

    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...
  7. C

    Homework Problem. Please Help!

    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. T

    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. B

    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. K

    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. S

    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. S

    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. C

    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. J

    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. D

    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. Y

    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. Y

    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. K

    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. U

    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...