A Paired Difference Experiment Yielded $\mathrm { n } _ { \mathrm { d } }$

question 82

Multiple Choice

A paired difference experiment yielded $\mathrm { n } _ { \mathrm { d } }$ pairs of observations. For the given case, what is the rejection region for testing $\mathrm { H } _ { 0 } : \mu _ { \mathrm { d } } = 15$ against Ha: $\mu _ { \mathrm { d } } < 15$ ?

$\mathrm { n } _ { \mathrm { d } } = 21 , \alpha = 0.05$

• A) \(t < - 1.721\)
• B) \(t < 2.086\)
• C) \(\mathrm { t } < 1.725\)
• D) \(\mathrm { t } < - 1.725\)

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