Answer:
Three t-tests are required.
Explanation:
Hailey wants to become a career counselor. What academic requirement will she need to complete in order to find a job?
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Applying the disinfectant once removes 90% of the bacteria, leaving 10% remaining.
Applying it a second time eliminates 90% of that remaining 10%, so you calculate 10 minus 90% of 10 to find the leftover bacteria after two applications.
This results in only 1% of the bacteria still being present, meaning that 99% of the original bacteria have been eradicated.
Applying it a second time eliminates 90% of that remaining 10%, so you calculate 10 minus 90% of 10 to find the leftover bacteria after two applications.
This results in only 1% of the bacteria still being present, meaning that 99% of the original bacteria have been eradicated.