Simplified confidence interval tests #454

Job	Run time
Documentation	1m 17s
Julia 1.8 - ubuntu-latest - x64 - push	4m 39s
Julia 1.8 - macOS-latest - x64 - push	7m 46s
Julia 1.8 - windows-latest - x64 - push	5m 32s
Julia 1.9 - ubuntu-latest - x64 - push	1m 45s
Julia 1.9 - macOS-latest - x64 - push	3m 52s
Julia 1.9 - windows-latest - x64 - push	6m 12s
Julia 1.10 - ubuntu-latest - x64 - push	1m 43s
Julia 1.10 - macOS-latest - x64 - push	8m 10s
Julia 1.10 - windows-latest - x64 - push	2m 30s
Julia nightly - ubuntu-latest - x64 - push	3m 1s
Julia nightly - macOS-latest - x64 - push	9m 33s
Julia nightly - windows-latest - x64 - push	8m 25s
	1h 4m 25s

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