An article claims that 12% of trees are infested by a bark beetle. A random sample of 1,000 trees were tested for traces of the infestation and found that 127 trees were affected. z = p - p/p q/n
Using the formula and data provided, what is the value of the z-test statistic?

0.6812

Step-by-step explanation:

Let p be the population proportion of trees are infested by a bark beetle.

As per given: p= 12%= 0.12

Sample size : n= 1000

Number of trees affected in sample = 1000

Sample proportion of trees are infested by a bark beetle. =

Now, the z-test statistic :

So,

Hence, the value of the z-test statistic = 0.6812 .

b.an increase in a causes b to decrease

49%

step-by-step explanation:

when you realize that you dont know just realize i just took a test and im so smart