The big chip cookie's 95% confidence interval for the amount of chocolate chips per cookie is [8.325,6.474].
Given that,
The quantity of chocolate chips in each big chip cookie at Lian's bakery is something she wants to promote. She chooses a sample of 46 cookies at random and discovers that the average amount of chocolate chips per cookie has a standard deviation of 2.7 and a mean of 7.4.
We have to find what is the big chip cookie's 95% confidence interval for the amount of chocolate chips per cookie.
We know that,
The formula is
=x±Z(S/√n)
=7.4±2.326(2.7/√46)
=8.325 and 6.474
Therefore, the big chip cookie's 95% confidence interval for the amount of chocolate chips per cookie is [8.325,6.474].
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