The average height of students at uh from an srs of 12 students gave a standard deviation of 3.1 feet. construct a 95% confidence interval for the standard deviation of the height of students at uh. assume normality for the data.

Step-by-step explanation:

The confidence interval for the standard deviation is given by :-

Given : n= 12 ; s= 3.1

Significance level :

Using Chi-square distribution table ,

Now, the 95% confidence interval for the standard deviation of the height of students at UH is given by :-

3< x< 5

step-by-step explanation:

|x - 4| < 1

there are two solutions, one positive and one negative.   remember to flip the inequality when taking the negative solution

x-4 < 1       x-4 > -1

add 4 to each side

x-4+4 < 1+4       x-4+4 > -1+4

x< 5                 x> 3

3< x< 5