Suppose the weights of 7 th graders at a certain school vary according to a norm

Question

Suppose the weights of 7th graders at a certain school vary according to a normal distribution with a mean of 100 pounds and a standard deviation of 7.5 pounds. A researcher believes the average weight has decreased since the implementation of a new breakfast and lunch program at the school. For a test of significance, state the null hypothesis. = 100 100 < 100 > 100 Suppose the weights of 7th graders at a certain school vary according to a normal distribution with a mean of 100 pounds and a standard deviation of 7.5 pounds. A researcher believes the average weight has decreased since the implementation of a new breakfast and lunch program at the school. For a test of significance, state the null hypothesis.

Explanation / Answer

Solution :

For a test of significance the null hypothesis is ,

Ho : = 0 here 0 = 100

So answer is = 100 .

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