question archive Assume you are a manager in one of the branches of the 7-Eleven company and a local bakery is offering to sell some kinds of bread in your branch
Assume you are a manager in one of the branches of the 7-Eleven company and a local bakery is offering to sell some kinds of bread in your branch
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Assume you are a manager in one of the branches of the 7-Eleven company and a local bakery is offering to sell some kinds of bread in your branch. The bakery is claiming more than 70% of people living in the neighborhood are fans of the products.
1. how big a sample should we collect?
2. Do we need to make any assumption to ensure that the z test is valid?
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According to the central limit theorem, if np(1-p) is greater than 10, we can assume normality.
Here, P = 0.7
A)
N*0.7*0.3 = 10.
N = 48.
2)
Yes, we need to assume.that sample is random and is normally distributed.
Step-by-step explanation
Answer).
According to the central limit theorem, if np(1-p) is greater than 10, we can assume normality.
Here, P = 0.7
A)
N*0.7*0.3 = 10.
N = 48.
2)
Yes, we need to assume.that sample is random and is normally distributed.
