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Could you show me the steps on how this is completed? A pizza store claims they...

Could you show me the steps on how this is completed?

A pizza store claims they will deliver your pizza in no more than 20 minutes. I don’t believe this is true. I found 7 people who recorded the time it takes for a pizza to get delivered. The average time was 22.7 minutes with a standard deviation of 4.3 minutes. Perform a hypothesis test assuming the population distribution is normal using a 0.05 level of significance to see if my claim is valid.

Thank you!

Math   Statistics-And-Probability   
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