he stats story of Steph Abner Ben
The stats story of
Steph Abner
Ben
What is the true rating for
Toy story 3?
• It is a C.I. or Estimate• There is no Ho or Ha
What type of test?
Why a 1-sample T interval for
Of course!!
RandomNormal n30 n=50Independent10%condition met
Conditions
Sampling Procedure
“Do you think Toy Story 3Is a great movie?”
10
9
8.5
8
7
6
5
4
• t *
Confidence Interval
xs
tn
Conclusion• We are 99% confident that the true mean
value for Toy Story 3 is in the interval from (8.037, 9.063)
• Convenience sample• Embarrassed to say they liked it• Only surveyed H.S. students
Potential Errors:
• Ask various age groups• Don’t wait last minute
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