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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