The following information is obtained from two independent samples selected from two normally distributed populations. n1 = 18 x1 = 7.82 σ1 = 2.35
n2 =15 x2 =5.99 σ2 =3.17

test at a 5% significance level if the two populations means are different

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Ben is interested in using a source that provides original research, current and developing trends and experts within specific fields. which source should he use?

Balanced rock sits on a thin spike of rock in a canyon what forces keep the rock balanced on its tiny pedestal