Forum: Statistics

If there are 4 independent groups of 7 subjects each, which multiple comparison procedure is best to achieve maximum power while maintaining...

Hi, I have the following linear regression problem "For r = .60 and a x that is 1.5 standard deviations above the mean x, I expect a dependent...

Hello, can i use xtfmb.ado in stata to make famamacbeth regression where i regress dependent variable on multiple independent variables? if so,...

Hey guys, 3 weeks ago I came across a problem that stumped me for my statistics course I'm enrolled in, and you were all so helpful I had to come...

suppose you purchase a bundle of 10 bare-root broccoli plants the sales clerk tells you that on average you can expect 5% of the plants to die before...

Not to familiar with Moment Generating Functions will some one walk me though this example.... MGF of X1+X2+X3+X4 and MGF or X3+X4

Dear all , I have a simple yet confusing problem, I am trying to figure out which is the correct approach to proceed. Here it goes I have a...

I have run 4 times the same experiment and in each experiment I have the same 4 conditions. In each group, in each experiment, I have 3 to 5 mice. I...

Hi all I have some a polygon area that is an output from an environmental model and some discreet data points some of which fall withing the...

Hey, I do have data on the nutritional status children as well as the education level of the father - it is a table with four educational levels...

Say I have a data set of customers with information such as bank account, age, telephone, credit history, emplyoment, etc... How could when I used...

Say I have dozens of samples and with them dozens of estimates of a population's mean along with associated confidence intervals -the samples could...

Gauss’s childhood insight into how to sum large sets of numbers in a linear series is analogous to that underlying the cross-products formulation for...

In ranking the quality of the last six red wines tasted, you and your significant other (a.k.a. “spousal unit”) agree, except inexplicably on the...

Hi all, Thanks for taking a look at this. Regression Statistics Multiple R 0.908734206 R Square 0.825797856 Adjusted R Square...

Hi! I am in need for advice on this, for me at least as new to the subject (have only taken 15 ECTS), tricky question: Anyone who could help...

here is the question i will have to present in class In a process of manufacturing metal piece using two different cooling processes. In order to...

Hi folks. I've got a set of chemical measurements taken from three different groups -- a control soil, a low-contamination soil, and a high...

I am so stumped. What is the probability John wins the game, given: Coming into the game, John should win 90% of the time, BUT an average...

Hi all, can someone point me in the right direction for how i would work out stat sig of share of spend? eg - 5 companies in market, ask ppl...

Hi All, I have the data of firm performance (say on a scale of 10) for 50 firms over 10 years. Which statistical test (with significance levels)...

Can someone see if this is correct? To devise effective marketing strategies it is helpful to know the characteristics of your customers. A study...

Hi everyone, I have this problem to solve. It's been a while since I tried to figured out how to do, but I am totally lost. Here it is. Prove...

Hello, I am currently studying for an midterm, and am running into a roadblock with some of the concepts concerning hypothesis testing applied to...

Hey guys, I was hoping someone can push me in the right direction. I'm not asking for you guys to do my work but rather just point me in the right...

Hello, I'm looking to collect data for the organization that I work for (a senior retirement community management company) and draw correlations...

Hi! I am wondering what kind of datatype our new variable will get if we add variables that have ordinal datatype. For example: SWLS scale that...

Hi everybody, of course, I tried to find a thread with an answer about my topic. Unfortunately without success. I ran a multi regression...

In a recent study, among the very elderly (85+ years) of the sample, few (only 5.5%) of the men were over 1.9 metres tall. Yet, among their...

I have viewed numerous websites and statistics resources and all state that paired samples are used for before and after comparisons in the same...

Hi all, I have the model of type Y_i=Beta_0_i+Beta_1_i*X1_i+...+Beta_k_i*X_k_i, for i=1:n There is no error term in this model, but for each...

I've got a small table, as follows: GROUP n xbar (s/rootn) Alcohol: 25 0.25 0.05 Placebo: 25 0.12 0.03 It asks me for...

Hello all, I am working on my assignment of two-way ANOVA and feel totally lost. In my understanding, hypotheses for two-way ANOVA are three. ...

Hi, Currently I'm doing research on analyst forecast accuracy and want to add another variable to my research: number of industries followed by an...

1. Suppose the lifetime of a certain types of televisions follow an exponential distribution with a median of 7 years. Assume the warranty period is...

make use of matrix or?

If x is uniformly distributed over the interval 8 to 12, inclusively (8 ≤ x ≤ 12), then the probability, P(13 ≤ x ≤ 15), is 15-13 = 2 12-8 = 4...

I've been going in circles trying to figure out the best way to analyze my data. Here goes... I'm studying changes in concentrations of various...

I am a software engineer with a very limited statistics background but the standard engineering math background. While in grad school I did some work...

Hi all, I'm currently working on my master thesis, and am trying to select data from a company database. However, in this database sometimes a...

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...

Hello, all. I’m new to statistics and was wondering if anybody can help with a problem that’s been on my mind. I’m interested in analyzing...

A major supermarket regularly receives batches of bottles of lemon juice from The Juice Factory.The supermarket will reject an entire batch if a...

In calculating power, what is the difference between n1 ! = n2 and n1 = n2? What does this mean? Can anyone clarify this?