A researcher works on a study that has a population standard deviation of 0.73a sample mean of 84.5 and a sample size of 60 .What is the margin of error with a confidence level of 95%

The critical value can be founded in the normal standard distribution table using the value of and we got . Replacing the info given we got:

Step-by-step explanation:

For this case we have the following info given:

represent the population deviation

represent the sample mean

represent the sample size

And we want to find the margin of error for a confidence level of 95%. So then the significance level would be and . The margin of error is given by:

The critical value can be founded in the normal standard distribution table using the value of and we got . Replacing the info given we got:

hello,

as we don't know if g(x) is continue,

answer b

f(x)=2x²-8x+1=2(x²-4x+4)+1-8=2(x-2)²-7

vertex is (2,-7) ( a minimum since coefficient of x² is > 0)