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The main products sold on an online app store are App1 and App2. The store claims that 80% of App1 buyers also buy App2. To
The main products sold on an online app store are App1 and App2. The store claims that 80% of App1 buyers also buy App2. To test this claim you take a random sample of 400 App1 buyers. You find out that 78% of buyers in the sample bought App2. Use a 10% significance level z-test to determine if the store's claim is correct.
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