A data set includes 40 pulse rates of men, and those pulse rates have a mean of 67.3 beats per minute and a standard deviation of 10.3 beats per minute. Construct a 99% confidence interval estimate of the standard deviation of the pulse rates of men. a) 8.4 beats per minute

The 99% confidence interval of the  standard deviation of the pulse rates of men is  

Step-by-step explanation:

From the question we are told that

  The  sample size is  n  =  40

  The mean is  

  The standard deviation is  

Generally the degree of freedom is mathematically represented as

=>  

=>  

From the question we are told the confidence level is  99% , hence the level of significance is    

=>  

Generally from the chi distribution table the critical value  of   at a degree of freedom of is  

Generally from the chi distribution table the critical value  of   at a degree of freedom of is  

Generally the 99% confidence interval of the standard deviation of the pulse rates of men is mathematically represented as

=>  

=>  

if x decreases by 4 then y increases by 10

step-by-step explanation:

21

step-by-step explanation: