Construct a 99% confidence interval for the population standard deviation of white blood cell count (in cells per microliter). assume 7 random samples were selected from a population that has a normal distribution. the sample has a mean of 7.106 cells and a standard deviation of 2.019 cells. 1.098 < σ < 4.973 4.042 < σ < 21.170 1.148 < σ < 6.015 1.319 < σ < 36.181

The correct option is 1.148 < σ < 6.015

Explanation:

The 99% confidence interval for the standard deviation is given below:

Where:

Therefore, the 99% confidence interval is:

Therefore, the option 1.148 < σ < 6.015 is correct

b: |12 – x| ≤ 0.25

step-by-step explanation:      

let x be the possible lengths in inches, of the ribbons jaime cut.

we have been given that jaime is cutting strips of ribbon for a project. he tries to cut each piece to be 12 inches long, but sometimes he cuts it too long or too short by as much as 0.25 inch.  

we can represent this information in an inequality as:

by the definition of absolute value function we will get,

upon combining our inequalities we will get,

therefore, the inequality   describes all the possible lengths (x), in inches, of the ribbons jaime cut.

step-by-step explanation:

answer: translate the circles so they share a common center point and dilate circle y by a scale factor of 3.