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    Test difference in mean battery life of two types of digital cameras

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    Q-5a. One of the important features of a camera is the battery life as measured by the number of shots taken until the battery needs to be recharged. The data below contain the battery life of 31 subcompact cameras and 15 compact cameras. Assuming that the population variances from both types of digital cameras are equal, is there evidence of a difference in the mean battery life between the two types of digital cameras at the 95% confidence level?

    Subcompact Compact
    320 520
    520 260
    160 400
    160 200
    300 300
    120 150
    520 360
    440 200
    300 260
    170 80
    150 200
    300 260
    180 400
    100 260
    150 200
    400
    170
    180
    160
    240
    320
    260
    150
    320
    180
    140
    220
    160
    340
    200
    130

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    https://brainmass.com/statistics/students-t-test/test-difference-in-mean-battery-life-of-two-types-of-digital-cameras-373302

    Solution Summary

    Step by step method for computing test statistic for student's t test is given in the answers.

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