Khan Academy psych/statistics problem help!

[callmesubo]

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Hello everyone I need help with the following khan academy question.

https://www.khanacademy.org/test-pr...-chunking--and-the-capacity-of-working-memory

It requires you to read the passage so if you do not have time it's okay. These are the following questions you will find that I felt like came from outer space.

Which of these mistakes could have caused a Type I error in the study shown in Table 1?

How many successive binary decisions are represented by 646464 binary alternatives?


Their explanation didn't help me much. After reading the passage what did you think was the null hypothesis?

 

[SpongeBobDude]

That passage requires some content review before attempting it. All these questions are covered in content review (take any prep material like EK, Kaplan, NS, TBR etc. and just read P/S section). Null hypothesis is stated in the passage H0=7 +/- 2 or that person can keep 7 digits in his short memory span (give or take 2 digits).