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    Students T-test

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    Group Statistics
      Group N Mean Std. Deviation Std. Error Mean
    Annual Income Control Group 42 20813.7143 10578.81613 1632.34677
    Experiment Group 42 22258.7619 8896.90632 1372.82245

    Independent Samples Test
      Levene's Test for Equality of Variances t-test for Equality of Means
    F Sig. t df Sig. (2-tailed) Mean Difference Std. Error Difference 95% Confidence Interval of the Difference
    Lower Upper
    Annual Income Equal variances assumed 1.563 .215 -.678 82 .500 -1445.04762 2132.88477 -5688.03487 2797.93964
    Equal variances not assumed     -.678 79.659 .500 -1445.04762 2132.88477 -5689.90279 2799.80755

    I hope it works for you as well. I just have to do the others. Good night!
    Mean difference Std error diff 95% Confidence Interval of the difference last 2 columns
    -1445.04762 2132.88477 -5688.03487 2797.93964

    1445.04762 2132.88477 -5689.90279 2799.80755

    In order to promote the habit of saving among low-income households, United Way of Greater Los Angeles conducted a pilot study in 2007 to determine the effectiveness of high-interest savings accounts by randomly selecting two groups of low-income savers. In this pilot, both groups were offered incentives to save every month, but one of the groups, (the experiment "E" group received a high subsidized rate of interest on monthly deposits while the control "C" received no such subsidies. Each group consisted of 42 individual savers. The pilot monitored amounts saved by each individual for 12 month. Participants opened their accounts during March through July of 2007 and their monthly deposits were monitored for 12 months.
    a. While there are differences in reported income between the Control and Experiment groups, are these differences statistically significant?

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    https://brainmass.com/statistics/students-t-test/t-test-differences-groups-investing-high-interest-380895

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    Group Statistics
      Group N Mean Std. Deviation Std. Error Mean
    Annual Income Control Group 42 20813.7143 10578.81613 1632.34677
    Experiment Group 42 22258.7619 8896.90632 1372.82245

    Independent Samples Test
    Levene's Test for Equality of Variances t-test for Equality of Means
    F Sig. t df Sig. (2-tailed) Mean Difference Std. Error Difference 95% Confidence Interval of the Difference
    Lower Upper
    Annual
    Income Equal variances assumed 1.563 .215 -.678 82 .500 -1445.04762 2132.88477 -5688.03487 2797.93964
    Equal variances not ...

    Solution Summary

    Step by step method for computing test statistic for students t test is given in the answer.

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