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Appreciate it for all your efforts that you have put in this.

Very interesting info.

I placed an order for your book download, and I want to cancel that order. I didn’t download the book

Order canceled. Let me know if I can be of further help. Regards, Stephanie

very interesting you tube presentation, grateful if you could help in steps in traditional and p-value of hypothesis testing

Will you please tell me how to become an actuary after doing bsc maths honours and what does he do.

would like to receive latest updates & from this site

Good Nigth!

How can to find standard score z from probability in normal standard?

Thanks!

Francisco

The probability is the area under the curve. You can look that area up in the center of a z-table to get the standard score. See http://www.statisticshowto.com/probability-and-statistics/normal-distributions/#NDWP

How do I purchased a hard-or-soft-bound printed copy? I like to make notes in the margins!

Hello

Please, what is the dependent and independent variable for this research topic “knowledge and determinants of substance use and abuse among people living with special needs in ibadan.

Hope to hear from you soon. Thank you for reply in advance

The independent variable is constant (i.e. it doesn’t change) so I would say the people living with special needs is the independent variable. So substance abuse would be the dependent.

Hi, I’m applying for a post as an Assistant Statistician in Northern Ireland. Part of that application involves being tested on “basic statistical and social research concepts”. It’s been 6 years since I graduated with a Psychology degree ans (sadly) most of my statistics knowledge has evaporated. Is there a resource on this site that might prove helpful?

Thanks in advance

Chris.

Hi. I intend to do my undergrad research on Occupational Safety and Health among farm workers, focusing on factors affecting safety and health practices on the farm. Could you give me some pointers on the study design, variables, and data analysis methods?

Hi, Chris, have you checked out my YouTube channel? The short (3-5 minute) videos should act as a refresher for statistics. Regards, S.

https://www.youtube.com/channel/UCs3IhN8VOA_5WxpAgbSmFkg

Glad it helps! Good luck with your class :)

I’m not exactly sure why you would want to use PSM for your study, but I’ll assume you know a lot more about it than you’ve written here. See the Propensity Score Matching article for some tips.

I’m stupid with this statistics. Here is the problem. Past records indicate that the probability of online retail orders that turn out to be fraudulent is 0.08. suppose that, on a given day, 20 online retail orders are placed. Assume that the number of online retail orders that turn out to be fraudulent is distributed as a binomial random variable. (a) what are the mean and standard deviation of the number of online retail orders that turn out to be fraudulent? (b) what is the probability that one online retail order will turn out to be fraudulent? (c)what is the probability that one online retail order will turn out to be fraudulent?

(d) What is the probability that two or more online retail orders will turn out to be fraudulent?

Delores,

Can you give me an idea of what you know / where you get stuck?

Yes, that’s not a problem at all. Please link back to this site. Thanks, and good luck with your project!

It’s nearly impossible to find well-informed people for this

subject, but you sound like you know what you’re talking about!

Thanks

Can you recommend a good book to learn from before signing up for a class ? Trying to get a head start

Just wanted to drop a line and say thanks! Came across this site from a google search working on a take-home stats midterm (PhD student). Then came across it again later while working on another problem. Both times it was the MOST helpful site. Awesome site! Much appreciated!

HI, in the article, “Sampling With Replacement / Sampling Without Replacement”, there is an error. Under sampling without replacement, the outcome “John,John” is listed as a possibility. Since sampling is without replacement and there is only one instance of “John” in the hat. it is impossible for “John” to be drawn more than once.

Thanks for the correction, Paul :)

I’m glad you found the site useful, and thank you for the recommendation!

Sorry, Jason. The code was written by a programmer who no longer works for us.

i have doubts in rank correlations

could explain me rank correlation when ranks repeated or equal.