What sample size should be used if we would like to estimate the mean age of the college students at a particular campus with 95% confidence? we would like to be accurate to within three years, and we will assume the population is normally distributed with a standard deviation of 5.1 years.

12

Step-by-step explanation:

The formula to find the sample size is given by:-

, where is the population standard deviation, is the z-value for the confidence interval and E is the margin of error .

As per given , we have

Population standard deviation :

z-value for 95% confidence interval :

Margin of error : E= 3

Then, the required minimum sample :-

Hence, the required minimum sample size = 12

a) y = -3x +2

b) y = 1/2x -6

these 2 can be combined into one equation.

-3x +2 = .5x -6

8 = 3.5x

x = 8 / 3.5 = 2.2857142857

y = -3 * (8 / 3.5) +2

y = (-24 / 3.5) + 2

y = -4.8571428571

step-by-step explanation:

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step-by-step explanation: