Comic strip for Statistic
Storyboard Text
- HOW TO DETERMINE THE APPROPRIATE TOOL WHEN:VARIANCE IS UNKNOWN
- who can tell me the answer?
- sir!
- Sir!
- HOW TO DETERMINE THE APPROPRIATE TOOL WHEN:VARIANCE IS UNKNOWN
- When the population variance is unknown, the appropriate test statistic to used is
- t-test
- In a z-test, the sample is assumed to be normally distributed. A z-score is calculated with population parameters such as population mean and population standard deviation.
- HOW TO DETERMINE THE APPROPRIATE TOOL WHEN:VARIANCE IS UNKNOWN
- Yes, Bryan!
- When the variance is known and either the distribution is normal or sample size is large (n is greater that or equal to 30), use z-test.
- meanwhile like a z-test, a t-test also assumes a normal distribution of the sample.
- T-TEST
- Z-TEST
- -The population standard deviation is known-The population is normally distributed.-The sample size is large (n30)-A z-score is calculated with population parameters
- -The population variance or standard deviation is not known-The sample size is less than 30 (n30)
- who can tell me the answer?
- HOW TO DETERMINE THE APPROPRIATE TOOL WHEN:VARIANCE IS UNKNOWN
- sir!
- HOW TO DETERMINE THE APPROPRIATE TOOL WHEN:VARIANCE IS UNKNOWN
- who can tell me the answer?
- sir!
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