In a sample of 14 CEOs, they spent an average of 12.9 hours each week looking into new product opportunities with a standard deviation of 4.9 hours. Find the 95% confidence interval. a. (10.3, 15.5)b. (8.0, 17.8)c. (10.1, 15.7)d. (9.9, 15.9)

c. (10.1, 15.7)

Step-by-step explanation:

The calculation of the 95% confidence interval is shown below:

Given that

n = sample = 14

average = = 12.9

Standard deviation = s = 4.9

Based on the above information

n - 1 = 14 - 1 = 13

Now the 95% confidence interval is

= (10.1, 15.7)

hence, the correct option is c.

you forgot an image

step-by-step explanation:

answer: 204

step-by-step explanation:

we are told that the revenue is

x⋅(4080−10x)=−10x^2+4080x

this is a quadratic function, so to maximize it we should find the x-value of its vertex. recall that the x-value of the vertex of the parabola ax^2+bx+c is given by the formula −b/2a.

so in this case, we have a=−10 and b=4080, so the x-value of the vertex is

−b/2a= −(4080)/2(−10)=204