Ford claims that the 2016 Mustang GT provides 425 HP (horsepower) of power. A random sample of 17 Mustang GTs was taken and the horse power ratings were followed an approximately normal model with a mean of 407.2 HP and a standard deviation of 41.96 HP. Find the critical value for a 99% confidence interval.
Solution :
n = 17
Degrees of freedom = df = n - 1 = 17 - 1 = 16
At 99% confidence level the t is ,
= 1 - 99% = 1 - 0.99 = 0.01
/ 2 = 0.01 / 2 = 0.005
t /2,df = t0.005,16 =
2.921
Critical value = 2.921
Ford claims that the 2016 Mustang GT provides 425 HP (horsepower) of power. A random sample...