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Researchers believe 75% of all shoppers spend more than they intend on a given trip to the mall. A random sample of 50 people showed that 42 of them spent more than they wanted to spend. Find the z-score and p-value that could be used to show whether more than 75% of all shoppers spend more than they want to spend.

a. p = 0.93, z = 1.5
b. p = 0.84, z = 1.693
c. p = 0.74, z = 1.045
d. p = 1.467, z = 0.93

Sagot :

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The answer is b P=0.84z =1.693
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