BUSI 230 HW 12.2 Test for Independence Assignment solutions complete answers
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A recent study examined the effects of carbon monoxide exposure on a group of construction workers. The following table presents the numbers of workers who reported various symptoms, along with the shift (morning, evening, or night) that they worked.
Test the hypothesis of independence. Use the =0.05 level of significance and the P-value method with the TI-84 Plus calculator. What do you conclude?
State the null and alternate hypotheses.
Determine whether to reject .
State a conclusion.
No smoking: The General Social Survey conducted a poll of adults in which the subjects were asked whether they agree that the government should prohibit smoking in public places. In addition, each was asked how many people lived in his or her household. The results are summarized in the following contingency table.
Test the hypothesis of independence. Use the 0.05 level of significance and the P-value method with the TI-84 Plus calculator. What do you conclude?
(a) State the null and alternate hypotheses.
(b) Find the P-value. Round your answer to at least four decimal places.
(c) Determine whether to reject .
(d) State a conclusion.
How big is your family? A survey asked a sample of adults how many children they had, and also how many siblings (brothers and sisters) they had. The results are summarized in the following contingency table.
(a)Compute the expected frequencies under the null hypothesis. Round your answers to two decimal places.
(b)Can you conclude the number of siblings, and number of children, are not independent? Use Excel and the =0.01 level of significance.
