You take a random sample of 419 Galaxy phones off an assembly line and find 0.12 proportion to be defective. What is a lower bound for a 90% confidence interval for the proportion of defective Galaxy phones from this assembly line

The lower bound for a 90% confidence interval for the proportion of defective Galaxy phones from this assembly line is 0.0939.

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of , and a confidence level of , we have the following confidence interval of proportions.

In which

z is the zscore that has a pvalue of .

For this problem, we have that:

95% confidence level

So , z is the value of Z that has a pvalue of , so .

The lower limit of this interval is:

The lower bound for a 90% confidence interval for the proportion of defective Galaxy phones from this assembly line is 0.0939.

hello :

70y^8 + 30y^6 = 2 ( 35 y^8 + 15y^6)

the lenght is : 35 y^8

the width is : 15y^6

95.03 is the answer. hope this !