Suppose that for a certain illness, the probability is 40% that a given patient will improve without treatment. Then the probability that at least n out of 20 patients will improve without treatment is given in the following table: 
Suppose we count the test significant if the p-value is 0.05 or less. How many patients must show improvement in order to make the test statistically significant?
Definitions:
Annual Interest Rate
The annual interest rate is the percentage of principal charged by the lender for the use of its money over one year.
Down Payment
An initial upfront partial payment for the purchase of expensive items/services such as a home or a car.
Annual Payments
Payments made once a year, often related to loans, leases, or insurance policies.
Lease
A contractual agreement where one party, the lessor, grants another party, the lessee, the right to use an asset for a specified period in exchange for payments.
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