Arandom sample of 250 students at a university finds that these students take a mean of 15.3 credit hours per quarter with a standard deviation of 1.6 credit hours. estimate the mean credit hours taken by a student each quarter using a 95% confidence interval. round to the nearest thousandth.

OR

(15.102, 15.498)

Step-by-step explanation:

The formula to find the confidence interval is given by :-

, where n is the sample size

= sample standard deviation.

= Sample mean

= Two tailed z-value for significance level of .

Given : Confidence level = 95% = 0.95

Significance level =

sample size : n= 250 , which is extremely large ( than n=30) .

So we assume sample standard deviation is the population standard deviation.

thus ,

By standard normal  distribution table ,

Two tailed z-value for Significance level of 0.05 :

Then, the 95% confidence interval for the mean credit hours taken by a student each quarter :-

Hence, the mean credit hours taken by a student each quarter using a 95% confidence interval. =(15.102, 15.498)

answer: sorry

step-by-step explanation: can you tell me pls how to find the rational of two integers

stew reads at the fastest rate of 265 words per minute.

step-by-step explanation:

it's a given that felicia reads at 260 word per minute and on connie's graph we can see that she reads 200 words per minute. since stew's table tells us that he read 795 in 3 minutes, we can divide 795 by 3 to find out how many words he reads per minute.

795/3 = 265

stew reads 265 words per minute - he reads at the fastest rate since felecia reads at 260 words per minute and connie reads at 200 words per minute.

stew (265) > felecia (260) > connie (200)