2017 springs TA3123-onne Homework: CH. 9 Score: 1.67 of 10 pts of 10 complete 6

Question

2017 springs TA3123-onne Homework: CH. 9 Score: 1.67 of 10 pts of 10 complete 6 Ajournal published a study orehe 'spofte tongue phenomenon tring to tink of a word that you know but cant istansy netrieve senordna ns. of the 40 seniors inthe older group oouldrecal the word. Compare the recal the two groups using 0.10 Does on group of Let ph Give the nul andatematve hypoeeses. Choose the eomoet answer o E. Ho (pm -pa) a Find the test statisc The test statstia Round to two decimal places as needed.) Enter your answer in the answer box and then click Check Answer 2 naming Hw scoret 1886%, 18.86 of 10o pts EQuestion Hep

Explanation / Answer

The null hypothesis is that p1-p2 = 0, while the alternate hypothesis is that p1-p2 is not equal to zero.

p1 = 33/40 = 0.825

Variance for group 1 = p1*(1-p1) = 0.825*(1-0.825) = 0.144

p2 = 19/40 = 0.475

p1-p2 = 0.350

Variance for group 2 = p2*(1-p2) = 0.475*(1-0.475) = 0.249

Variance of distribution of difference of call rates = 0.144+0.249 = 0.393

Standard deviation of distribution of difference of call rates = 0.3930.5 = 0.626

Thus, z = (0.350-0)/0.626 = 0.56

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