Z-Test
Test of significance for single mean
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Test of significance for single mean
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Confidence Interval for two tailed test
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Confidence Interval (right tailed test)
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Confidence Interval (left tailed test)
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Test of significance for difference of
means of two large samples
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Test of significance for difference of
means of two large samples
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Test of significance for difference of
means of two large samples
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Test Statistic
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Test Statistic
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let’s say we want to know if Girls on average score 10 marks more than the boys. We have the information that
the standard deviation for girls’ Score is 100 and for boys’ score is 90. Then we collect the data of 35 girls and 30
boys by using random samples and record their marks.
Mean Score for Girls (Sample Mean) is 641
Mean Score for Boys (Sample Mean) is 613.3
Finally, we also set our ⍺ value (significance level) to be 0.05.
Confidence Interval for two tailed test
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Confidence Interval for right tailed test
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Confidence Interval for left tailed test
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Test of significance for a single
proportion
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Test of significance for a single
proportion
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Confidence Interval for two tailed test
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Confidence Interval for right tailed test
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Confidence Interval for left tailed test
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Test of significance for difference of
proportions
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Test of significance for difference of
proportions
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Test of significance for difference of
proportions
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Test of significance for difference of
proportions
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Test of significance for difference of
proportions
you’re testing two flu drugs A and B. Drug A works on 41 people out of a sample of 195. Drug B works on 351
people in a sample of 605. Are the two drugs comparable? Use a 5% alpha level.
Confidence Interval for two tailed test
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Confidence Interval for right tailed test
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Confidence Interval for left tailed test
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