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Author Question: A random sample of 800 high school boys showed that 420 had done strenuous exercise during the past ... (Read 90 times)

dbose

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on: Jul 24, 2018
A random sample of 800 high school boys showed that 420 had done strenuous exercise during the past year. The researcher wants to test the hypotheses below for p = the proportion of all high school boys who do strenuous exercise. H0: p  0.50 Ha: p > 0.50 Report the conclusion in the context of the situation.

Question 2

The household income in a certain community is known to have a right skewed distribution with a mean of 42,000 and a standard deviation of 5,000 . Without knowing the exact distribution we cannot find the probability that a randomly selected household has a yearly income less than 41,000 . Suppose we randomly sample 80 incomes from this population, what is the (approximate) probability that the average income in the sample is less than 41,000?


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pikon

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Reply #1 on: Jul 24, 2018
Answer to Question 1

The evidence is not strong enough to discount the possibility that the proportion of boys who do strenuous exercise is 50 or less.

Answer to Question 2

0.0368


dbose

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Reply 2 on: Jul 24, 2018
Wow, this really help

juliaf

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Reply 3 on: Yesterday
Gracias!

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