1. You want to see if the number of minutes cell phone usersuse each week has ch

Question

1. You want to see if the number of minutes cell phone usersuse each week has changed from its mean of 120 minutes 2 years ago.You take a random sample of 100 cell phone users and find anaverage of 135 minutes used. A) H0: p = 120; HA: p 120 B) H0: = 120; HA: 120 C) H0: = 120; HA: <120 D) H0: = 135; HA: 135 E) H0: x-bar = 135; HA: x-bar >135 2. Suzie has installed a new spam blocker program on heremail. She used to receive an average of 20 spam emails a day. Isthe new program working? A) H0: p = 20; HA: p 20 B) H0: = 20; HA: >20 C) H0: = 20; HA: <20 D) H0: > 20; HA: =20 E) Not enough information is given 1. You want to see if the number of minutes cell phone usersuse each week has changed from its mean of 120 minutes 2 years ago.You take a random sample of 100 cell phone users and find anaverage of 135 minutes used. A) H0: p = 120; HA: p 120 B) H0: = 120; HA: 120 C) H0: = 120; HA: <120 D) H0: = 135; HA: 135 E) H0: x-bar = 135; HA: x-bar >135 2. Suzie has installed a new spam blocker program on heremail. She used to receive an average of 20 spam emails a day. Isthe new program working? A) H0: p = 20; HA: p 20 B) H0: = 20; HA: >20 C) H0: = 20; HA: <20 D) H0: > 20; HA: =20 E) Not enough information is given

Explanation / Answer

(1) Answer: B) H0: = 120; HA: 120 (2) Answer: B) H0: = 20; HA: > 20

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