6 is c, i'm not entirely sure about 7
Answer:
a, b and c.
Step-by-step explanation:
The statistical inference may be defined as the process of using the data analysis to infer the properties of an underlying distribution for a probability.
In the context, for testing the population proportion p, the following conditions are used to verify the inference procedures so as to make the statistical inferences :
-- data that are collected by a random assignment or by a random sample.
-- sample size should be less than 10% of population size.
-- The
and the
for the sample size
as well as for the hypothesis proportion, 
An obtuse triangle must have an angle greater than 90degrees (cannot equal 90). Therefore, A. would be the correct answer. This is because A. is the only set of angles that includes an angle greater than 90. Also, all angle measures add up to equal 180degrees.