Answer:
a. difference of means
Step-by-step explanation:
Given that :
Mean , x = 9.4
Standard deviation,
= 2.5
Number,
= 12
Mean, y = 6.5
standard deviation,
= 2.4
Number,
= 12
The null hypothesis is : 
The alternate hypothesis is : 
Level of significance,
= 0.1
From the
= 1.363
Since out test is right tailed.
Reject
, if 
We use the test statics,





The value of
with minimum
that is 11 df is 1.363
We go
and
= 1.363
Decision making:
Since the value of
and we reject the 
The p-value : right tail 
= 0.00724
Therefore the value of
, and so we reject the 
Thus we are testing 'the difference of means" in this problem.
Answer:
8.5%
Step-by-step explanation:
.17/2 = 0.085 or 8.5%
Answer:
x = 8
Step-by-step explanation:
The sum of the exterior angles of a polygon = 360°
Sum the exterior angles and equate to 360
62 + 66 + 77 + 59 + 12x = 360, that is
264 + 12x = 360 ( subtract 264 from both sides )
12x = 96 ( divide both sides by 12 )
x = 8
Answer:
90 units
Step-by-step explanation:
Answer:
The first option is correct.