Sprite is wary that their new machines is inconsistent for being brand new. They randomly select 27 bottles of Sprite and got a mean of 16.84 ounces with a standard deviation of 0.51 ounces. Assume the population is normally distributed. a) Find the critical values, ?2 1−?/2, which is chisquare 1-alph over 2 for 90% confidence level and n = 27. b) Find the critical values, ?2 ?/2 which chisquare alpha over 2 , for 90% confidence level and n = 27 c) Construct a 90% confidence interval for the population standard deviation using the critical values you found in part (a) and (b). d) If the standard deviation for the new machines is less than 1-ounce Sprite will keep the new machines, using part (c) confidence interval, should they consider returning the new machines?
Sprite is wary that their new machines is inconsistent for being brand new. They randomly select 27 bottles of Sprite and got a mean of 16.84 ounces with a standard deviation of 0.51 ounces. Assume the population is
a) Find the critical values, ?2 1−?/2, which is chisquare 1-alph over 2 for 90% confidence level and n = 27.
b) Find the critical values, ?2 ?/2 which chisquare alpha over 2 , for 90% confidence level and n = 27
c) Construct a 90% confidence interval for the population standard deviation using the critical values you found in part (a) and (b).
d) If the standard deviation for the new machines is less than 1-ounce Sprite will keep the new machines, using part (c) confidence interval, should they consider returning the new machines?
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