Arandom sample of 145 students is chosen from a population of 4,250 students. if the mean iq in the sample is 130 with a standard deviation of 7, what is the 90% confidence interval for the students' mean iq score?

125-135

Step-by-step explanation:

The standard deviation is 7. This implies that the IQ scorings can be between 123 and 137. With a 90% confidence in these numbers, 125-135 is the closest interval to 90% confidence.

(129.04,130.96)

Step-by-step explanation:

Given : Sample size : n= 145

Mean IQ in the sample :

Standard deviation :

Significance level :

Critical value :

The confidence interval for population mean is given by :-

Hence, the 90% confidence interval for the students' mean IQ score is (129.04,130.96)

i get you, what you should do is think of the positive things that would come out of it. it will make yours parents proud and raise your grade. you should always try and if you can't focus tell the teacher.