Do the questions have to be answered correctly to receive the 50 bucks?
willing to paypal 50$$$ to the person who can help me answer 3 questions.
1, The mean weight of 9 randomly selected 5 years old boys babies at a local area was found to be 40 lbs and the standard deviation was found to be 5 lbs. If the weights of newborn babies is approximately normally distributed
A, Find a 95% confident interval for the average weight of all newborn babies at this hospital
B, if you increase sample size, will the confident interval estimate be wider or narrower? Why?
2,The starting salaries of college instructors have a standard deviation of $2000. How large sample is needed if we wish to be 95% confident that our sample mean will be within $500 of the true average salary of al college instructors?
5, An editor wants to estimate average the number of pages in bestselling novels, so that his estimate falls within 20 pages of the true average. Assuming that the standard deviation is 63 pages, how large a sample of bestselling novels is needed to achieve
1) 90% confident 2) 95% confident
Do the questions have to be answered correctly to receive the 50 bucks?
"If you torture the data long enough it will eventually confess."
-Ronald Harry Coase -
It doesn't say. But I oppose using paypal! Those guys are dicks: http://www.regretsy.com/2011/12/05/cats-1-kids-0/
well... i guess they're so big they can get away with anything now...
if not paypal, then what can people use? i always use paypal...
for all your psychometric needs! https://psychometroscar.wordpress.com/about/
** clears voice **
MAH FELLOW TSers:
I CLAIM THIS THREAD IN THE NAME OF THE LULZ NOW.... WELL, BOTH THE LULZ AND THE QUEEN (just because i like her hats & i'm canadian). SO IT'S NOW OPEN TO RANDOMNESS, CRAZINESS AND ANYTHING PEOPLE WANT...
for all your psychometric needs! https://psychometroscar.wordpress.com/about/
so this is code for a modified bootstrapped likelihood ratio test in case anyone out there ever needs to test the significance of a variance component using the lme4 package in R for multilevel/HLM models. i did this for a friend of mine who was having trouble in her class so it's addressed to her but if you change around a few things, anyone can use it. just follow along what i told her:
Code:library(lme4) ### IMPORTS THE DATASET. I GUESS YOU'LL CHANGE THIS ### PATH TO MAKE IT WORK datum<-read.csv("G:\\SAMstudy1.csv", header=TRUE, sep=",") ### WORKS OUT THE DESIGN SETTING, DECLARING AS FACTORS WHAT ### SHOULD BE FACTORS, VARIABLES WHAT SHOULD BE VARIABLES AND ### WRAPS UP EVERYTHING IN A NICE DATAFRAME Rating <- datum$Rating TReport <- datum$TReport Target <- as.factor(datum$Target) myData <- data.frame(Rating,TReport,Target) ### FOLLOWING YOUR CLASSè EXAMPLE, I THINK THIS IS WHAT'S EXPECTED ### FROM YOU TO DO nullmod <- lmer(Rating ~ 1 + TReport + (1 | Target) , data=myData) altmod <- lmer(Rating ~ 1 + TReport + (1 | Target) + (0 + TReport | Target), data=myData) anova(nullmod, altmod) ############# BOOTSTRAPPED LIKELIHOOD RATIO TEST ############## ### STEP (1) HERE IS THE DIFFERENCE IN LOG-LIKELIHOODS WE ARE GOING ### TO BUILD OUR BOOTSTRAPPED ESTIMATE AROUND diffLogLik <- as.numeric(2*(logLik(altmod)-logLik(nullmod))) ### STEP (2) LET'S SET UP THE DESIGN OF THE BOOTSTRAP. reps IS HOW MANY TIMES TO RUN IT. lrstat IS WHERE I WILL STORE MY RESULTS. y IS A VECTOR OF RESPONSES SIMULATED FROM THE NULL DISTRIBUTION reps <- 100 lrstat <- numeric(reps) y <- simulate(nullmod) ### STEP (3) HERE'S THE SETTING OF THE BOOTSTRAP for (i in 1:reps) { y <- unlist(simulate(nullmod)) null <- lmer(y ~ 1 + TReport + (1 | Target), data=myData) alt <- lmer(y ~ 1 + TReport + (1 | Target) + (0 + TReport | Target), data=myData) lrstat[i] <- as.numeric(2*(logLik(alt)-logLik(null))) } ### STEP (4) HERE IS WHERE MY RESULTS GET REPORTED. I SHOULD BE LOOKING FOR A ### pVALUE LESS THAN 0.05 AND WITH A SMALL STANDARD ERROR TO BE EXTRA-SURE ### IT DOESNT CROSS OVER THE 0.05 DEATHZONE!!! pValue <- mean(lrstat > diffLogLik) pValueSTDError <- (pValue*(1-pValue))/reps pValue pValueSTDError
for all your psychometric needs! https://psychometroscar.wordpress.com/about/
The true ideals of great philosophies always seem to get lost somewhere along the road..
Way to go guys. Once again you all ruined my capitalistic scheme and no early Christmas money. Though we have no rescind of offer this time...
I swear some contributor is making fake member names and getting on here and generating fun little spinoff threads for the members.
*Wait*
....
Dason?????????????
"If you torture the data long enough it will eventually confess."
-Ronald Harry Coase -
Come on, 5 year old babies...
That's a picture of the Italian Stallion when he was an 8 year old baby
Very perceptive that karkid or should I say Dason, is a crafty fellow.Originally Posted by Mean Joe
"If you torture the data long enough it will eventually confess."
-Ronald Harry Coase -
Hey now... I already used my extra email account to make spunky think twice about spouting out calls for certain authors deaths. And I'm way too lazy to go through the process of getting another email account and creating yet another sockpuppet just for some laughs. OR AM I?!?
Also - I adamantly deny any accusations that I have created any sockpuppet accounts in the past. Ignore the implications in the first paragraph that I may have done exactly this. The person that wrote that first paragraph can not be trusted.
for all your psychometric needs! https://psychometroscar.wordpress.com/about/
****... that might be too long for a user name...
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