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9 Cards in this Set

  • Front
  • Back
What are the requirements for testing a claim about µ with unknown σ?
1) The sample is a simple random sample.
2) The value of σ is not known.
3)The population is normally distr. OR n > 30.
Since σ is not known, what is used instead?
The sample stdv (s) is used instead.
With σ unknown, what type of distribution is used?
t-distribution
A standard normal distribution has a mean of:
The student t distribution has a mean of:
A standard normal distribution has a mean of: z = 0
The student t distribution has a mean of: t = 0
The standard normal distribution has a σ of:
The students t distribution has a σ:
The standard normal distribution has a σ of 1
The students t distribution has a σ > 1
As the sample size gets larger, the students t distribution:
gets closer to the standard normal distribution.
When testing a Claim about µ: σ unknown:
How do you find Test stats on the TI/84?
stat, test, t-test
When testing a Claim about µ: σ unknown:
How do you find Tcr values on the TI/84?
2nd, distr, InvT(area to left, df)
When testing a Claim about µ: σ unknown:
How do you find P-v on the TI/84?
2nd, distr, tcdf(Ttest & large number, df)