A researcher for a large pharmaceutical company is testing a new drug designed t

Question

A researcher for a large pharmaceutical company is testing a new drug designed to reducewhat are called “cluster” headaches. This new, as yet untested drug, is called “No-Ache”, or NA for short. He believes that NA will reduce the number of cluster headaches per week for chronic cluster headache sufferers. For a week prior to the administration of NA, each participant records the number of cluster headaches suffered. These are called the pre-treatment or baseline scores. Participants are then administered NA two times daily (in the morning and the evening) for the following three weeks and again, during the fourth week. During the fourth week of NA doses the number of cluster headaches is measured again. These data are below.

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Is this a one-tailed HA or a two-tailed HA ?

A. One-Tailed

B.Two-Tailed

Participant Number of Cluster Headaches at Pre-Treatment
Baseline
X1 Number of Cluster Headaches After daily doses of
No-Ache (NA)
X2 Bob 14 11 Fred 7 11 Ted 21 20 Mary 17 13 Evia 20 15 Juan 18 8 Charla 28 23 James 15 16 Cynthia 17 14 Maggie 12

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Explanation / Answer

as if we are checking if resultant is in one direction (cause weather  NA will reduce the number of cluster headaches per week) tehefore this should be one tailed test.

option A is correct

please revert if there are any other subparts

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