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Estimating P-values from simulations

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Problem

An employee at an aquarium monitors how much their sea otters eat. The amount of food a particular otter eats daily is approximately normally distributed with a mean of 17 pounds and a standard deviation of 1 pound. They suspected this otter was not eating enough, so they took a random sample n=10 days and observed a sample mean of x¯=16.5 pounds of food per day.
To see how likely a sample like this was to occur by random chance alone, the employee performed a simulation. They simulated 40 samples of n=10 values from a normal population with a mean of 17 pounds and a standard deviation of 1 pound. They recorded the mean of the values in each sample. Here are the sample means from their 40 samples:
They want to test H0:μ=17 lbs vs. Ha:μ<17 lbs where μ is the true mean amount of food per day.
Based on these simulated results, what is the approximate p-value of the test?
Note: The sample result was x¯=16.5 lbs.
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