Suzie has installed a new spam blocker program on her email.She used to receive an average of 20 spam emails a day.Is the new program working? A) $\mathrm { H } _ { 0 }$ : ? = 20 $\mathrm { H } _ { \mathrm { A } }$ : ? 20 D) $\mathrm { H } _ { 0 }$ : ? 20 $\mathrm { H } _ { \mathrm { A } }$ : ? = 20 E)Not enough information is given.

Question

Suzie has installed a new spam blocker program on her email.She used to receive an average of 20 spam emails a day.Is the new program working?
A) $\mathrm { H } _ { 0 }$ : ? = 20 $\mathrm { H } _ { \mathrm { A } }$ : ? < 20
B) $\mathrm { H } _ { 0 }$ : ? = 20 $\mathrm { H } _ { \mathrm { A } }$ : ? ? 20
C) $\mathrm { H } _ { 0 }$ : ? = 20 $\mathrm { H } _ { \mathrm { A } }$ : ? > 20
D) $\mathrm { H } _ { 0 }$ : ? > 20 $\mathrm { H } _ { \mathrm { A } }$ : ? = 20
E)Not enough information is given.

Quizplus · Accepted Answer

The null hypothesis ($\mathrm { H } _ { 0 }$) represents the situation before the change (receiving an average of 20 spam emails a day), and the alternative hypothesis ($\mathrm { H } _ { \mathrm { A } }$) represents the expected outcome if the spam blocker is working (receiving less than 20 spam emails a day).

Suzie Has Installed a New Spam Blocker Program on Her H0\mathrm { H } _ { 0 }H0​

Suzie Has Installed a New Spam Blocker Program on Her $\mathrm { H } _ { 0 }$