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Z-test to determine difference between 2 population means

5 years ago in Data Analysis By Keerthi Gupta

Research Objectives

All Answers (6 Answers In All)

By Nirav Answered 5 years ago

No you cannot you t-test here. T-test is definitely used to determine significance difference between the mean of two groups. But the groups will be related in specific features.

By Jennifer Answered 5 years ago

Use Z-test. But there are several considerations for performing this test. 1.Sample size must be greater than 30. If not use t-test. 2.Data points should be independent from each other. 3.Data must be normally distributed. 4.Data must be randomly chosen from a population. 5. Sample sizes must be equal (if possible)

By Varun Answered 5 years ago

Z-test is used different purpose. Z-test for single proportion Will be used to test a hypothesis on a population proportion value. Z-test for difference of proportions can be utilised to test the hypothesis 2 populations having the same proportion.

By Raghu Answered 5 years ago

You can check out http://www.stat.ucla.edu/~cochran/stat10/winter/lectures/lect19.html, http://www.how2stats.net/2014/03/one-sample-z-test.html

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