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Answer:
b. Right-Tailed
Step-by-step explanation:
This hypothesis test have a claim that the proportion of all small businesses that fail is higher than 20%. The alternative hypothesis is then written as:
If the sample outcome gives a test statistic that is higher than the critical value (z>z_c), it will fall in the rejection region and the null hypothesis, that states that the proportion is not different from 20%, will be rejected.
As the rejection region comprises all the values in the right tail, above the critical value, we can conclude this is a right-tailed test.