7. Hypothesis Testing: Introduction to Hypothesis Testing
Computing the p-value and Making a Decision
The amount of dissolved oxygen in water (mg per liter) is normally distributed with unknown mean #\mu# and standard deviation #\sigma = 0.85#.
A researcher collects one-liter water specimens from #240# randomly-selected locations along a river and measures the amount of dissolved oxygen in each specimen.
The researcher plans on using a #z#-test to determine if the mean oxygen content of the river significantly differs from #7# mg per liter, at the #\alpha = 0.09# level of significance.
State the null and alternative hypotheses of the proposed test.
A researcher collects one-liter water specimens from #240# randomly-selected locations along a river and measures the amount of dissolved oxygen in each specimen.
The researcher plans on using a #z#-test to determine if the mean oxygen content of the river significantly differs from #7# mg per liter, at the #\alpha = 0.09# level of significance.
State the null and alternative hypotheses of the proposed test.
#H_0 : \mu\,\,#
#H_a : \mu\,\,#
#H_a : \mu\,\,#
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