In a survey of twelve harbor business school graduates, the mean starting salary was $93,000, with a standard deviation of $17,000. what is the 95% confidence interval for the average starting salary among all harvard graduates

Step-by-step explanation:

Given : Sample size : n=12 , which is small sample (n<30), so we use t-test.

Sample mean :

Standard deviation :

Significance level :

Then , Critical value :

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

Hence, the 95% confidence interval for the average starting salary among all Harvard graduates =

m a t h w a y. c o m

step-by-step explanation:

1 x=22.52

2: 65/39=604+39x

65x-39x=604

26x=604

x=604/26

×=23.23