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In case of xxx problem x xxxxxx xxxxxxx me xx xxxxxx it

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Confidence intervals contain population xxxxxx found xx be consistent xxxx the data. If x xxxxxxxxxx xxxxxxxx xxx a xxxx difference includes xx xxx xxxx xxx xxxxxxxxxx with x population mean difference xx 0. If the xxxxxxxxxx is xx the xxxxxxxxxx means xxx xxxxxx xx the xxxxxxxxxx interval xxx x difference excludes 0, the xxxx xxx xxx xxxxxxxxxx with xxxxx population means. x xxx xxxxxxxxxx xxxxxxxx xx xx interval xxxxxxxxx xx x xxxxxxx that's xxxxx xxx xx the xxxxx

To construct a confidence xxxxxxxxx we need to know xxx xxxxxxxxxxx xx the difference xxxxxxx sample xxxxxx xxxx means xx need xx know how xx xxxxxxx xxx standard deviation of the xxxxxxxx distribution of the xxxxxxxxxxx

If xxx population xxxxxxxx xxxxxxxxxx are known, xxx standard deviation xx the xxxxxxxx

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