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Consider a large-sample level 0.01 test for testing h0: p = 0.2 against ha: p > 0.2.

17/12/2020 Client: saad24vbs Deadline: 2 Day

8.2 Let the test statistic Z have a standard normal distribution when H0 is true. Give the P-value for each of the following situations. (Round your answers to four decimal places.)


(a) Ha: μ > μ0,


z = 1.78


P-value = 1 (b) Ha: μ < μ0,


z = −2.74


P-value = 2 (c) Ha: μ ≠ μ0,


z = 2.83 or z = −2.83


P-value = 3




Let the test statistic T have a t distribution when H0 is true. Give the P-value for each of the following situations. (Round your answers to three decimal places.)


(a)


Ha: μ > μ0, df = 18, t = 2.964


P-value = 1 (b)


Ha: μ < μ0, n = 24, t = 2.441


P-value = 2 (c)


Ha: μ ≠ μ0, n = 36, t = −1.791 or t = 1.791


P-value = 3


You may need to use the appropriate table in the Appendix of Tables to answer this question.


8.5 The drying time of a certain type of paint under specified test conditions is known to be normally distributed with mean value 75 min and standard deviation 9 min. Chemists have proposed a new additive designed to decrease average drying time. It is believed that drying times with this additive will remain normally distributed with σ = 9. Because of the expense associated with the additive, evidence should strongly suggest an improvement in average drying time before such a conclusion is adopted. Let μ denote the true average drying time when the additive is used. The appropriate hypotheses are H0: μ = 75 versus Ha: μ < 75. Consider the alternative value μ = 74, which in the context of the problem would presumably not be a practically significant departure from H0.


(a) For a level 0.01 test, compute β at this alternative for sample sizes n = 81, 900, and 2500. (Round your answers to four decimal places.)


n


β


81


1


900


2


2500


3


(b) If the observed value of


X


is


x = 74,


what can you say about the resulting P-value when n = 2500? Is the data statistically significant at any of the standard values of α? (Round your z to two decimal places. Round your P-value to four decimal places.)


z


=


4


P-value


=


5





Consider a large-sample level 0.01 test for testing


H0: p = 0.2


against Ha: p > 0.2.


(a) For the alternative value p = 0.21, compute β(0.21) for sample sizes n = 100, 900, 10,000, 40,000, and 90,000. (Round your answers to four decimal places.)


n


β


100


1


900


2


10,000


3


40,000


4


90,000


5


(b) For p̂ = x/n = 0.21, compute the P-value when n = 100, 900, 10,000, and 40,000. (Round your answers to four decimal places.)


n


P-value


100


6


900


7


10,000


8


40,000


9


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