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)

the answer is b

step-by-step explanation:

5050

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