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Probability Distributions - GCSE Statistics Flashcards | StudBud
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Probability Distributions - GCSE Statistics
Probability Distributions - GCSE Statistics
12 terms
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StudBud Administration
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Binomial, Normal, Standardised scores, Quality Control
Flashcards
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Questions
12
Answers
1
Is 99.7% of values within 3 standard deivations?
True
False
2
When is normal distributions suitable?
Symmetrical and bell - shaped
Data is continuous
All of above
Mode, median and mean are approx. equal
3
Does a negative standardised score show it is greater than the mean?
False
True
4
What should you do if the sample is between action and warning line?
SERIOUSLY YOU NEED TO STOP THE MACHINE!!!!!!!!!
STOPPPPPPPPPPPPPPPPP!!!!!!!!!!!!!!!!!!!
STOPPPPPPP!
STOPPPPP!!!!
5
So if 68% is actually 1 standard deviation, what percent is 2 standard deviations?
75%
95%
100%
85%
6
Where should warning lines and Actions lines be drawn on a quality control graph?
Action = ±3δ Warning = ±1δ
Action = ±3δ Warning = ±2δ
Action = ±4δ Warning = ±1δ
Action = ±2δ Warning = ±3δ
7
Why might you use standardised scores?
You can compare marks on tests
See your percentage on your test
See how well you did on your test
You can't compare marks on 2 tests (one is more difficult than other)
8
What is the equation for standardised scores?
Mark - Mean / Standard deviation
Mark + Mean x Standard deviation
Mark + Mean / Standard deviation
Mark - Mean x Standard deviation
9
Is 68% of values in 2 standard deviations?
False
True
10
What conditions do you need to be able to find the Binomial Distribution?
Number of trials are fixed, Trials are independent, Only 1 outcomes
Number of trials are fixed, Trials are independent, Only 2 outcomes
Number of trials are not fixed, Trials are independent, Only 2 outcomes
Number of trials are fixed, Trials are not independent, Only 2 outcomes
11
Are the 2 outcomes: Failure / Success?
False
True
12
What equation is used for Binomial Distributions?
P(A n B) x P (A)
P (A n B) / P (B)
P(r success in n trials) = Pr x (1-p)n-r
P(r success in n trials) = nCr x Pr x (1-p)n-r
