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4 Cards in this Set
- Front
- Back
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Name the necessary conditions to assume that a calculated z statistic follows a t distribution |
1. The sample is random 2. The population is normally distributed |
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When would a t-test be used |
When: - the population variance is unknown - sample size is less than 30 |
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Give the formula for s^2 that is not given in the book |
S^2 = ((sigma Xi^2) - n(Xav)^2)/n-1 |
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Describe what the t-table represents for a given value, t and a probabiliy, p |
P(T<(or equal to) t) = p. The value in the table is t, and the probability on the top row is p. T represents the statistic caluculated by the Z statistic method. |
