Starting salaries of 135 college graduates who have taken a statistics course have a mean of $42,650. Suppose the distribution of this population is approximately normal and has a standard deviation of $8,988. Using a 93% confidence level, find both of the following: (NOTE: Do not use commas nor dollar signs in your answers.)
(a) The margin of error:
(b) The confidence interval for the mean μ:

Hence, the margin error is and the confidence interval for the mean is .

Step-by-step explanation:

Given :

Sample size

Sample mean

Standard deviation

Confidence level is

(a)  

The margin error

 confidence level

    from the table

Now, the margin error

(b)

The confidence interval for the mean :

set each factor equal to 0

4x-3 = 0

2x-1 = 0

solve for x.

4x-3=0

4x=3

x= 3/4

solve for x. 

2x-1= 0

2x= 1

x= 1/2

your answer should be 1/2 is less than or equal to x and 3/4 is greater than or equal to x

answer: (1,3) (3,-1) (5,-5) ?

step-by-step explanation: