Answer: 

Step-by-step explanation:
- A null hypothesis is a hypothesis where a researcher generally try to disprove, it says that there is no statistically significant relationship between the two variables .
- An alternative hypothesis says that there is a statistical significance between two variables.
Claim 1. : Mean age of online dating service users is 40 years.
i.e.
, since it has equals sign so we take this as null hypothesis.
Claim 2. : Mean age of online dating service users is not 40 years.
⇒ Null Hypothesis : 
Alternative hypothesis : 
A = LW
A = 28 × 7.1
A = 198.8
The correct answer is A.
Answer:
59 ml/hr
Step-by-step explanation:
Amount of solution = 250 ml
Flow rate = 250 ÷ 4.25 hrs = 58.82352941176 ml/hr
since answer is required in ml/hr and not gtt/hr,
Therefore answer = 59 ml/hr to the nearest flow rate.