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.

first option

a function is a relation in which an input is paired with exactly one output.

so, let's find the right answer.

in our first option, our inputs are january, february, and march. the outputs are 30, 28, and 25. each input has it's own output. this is correct!

our second option we know is incorrect, because ms. valverade has two outputs, dogs and cats. this is not a function.

our third option is incorrect as well. the yellow square has two ouputs, the square and the triangle.

lastly, in our fourth option, we see the number 7 two times with a different output. therefore, this is not a function.

remember: each input must be paired with only one output!

d. is the correct answer

step-by-step explanation: