I need help with this please, for the 20 data point you could input whatever numbers you prefer that makes it easier for you, thank you so much in advance!

In 2017, A study revealed that the mean number of hours of sleep a child between 5 and 12 years old gets is 8.9, with a standard deviation of 3.2. Test the null hypothesis Ho that this mean today is unchanged vs. the alternative hypothesis H1 that this number is now smaller. Your sample should contain at least 20 data points (basically asking 20 people [Family, friends, acquaintances] at least on the number of hours their kids get, collecting the answers, and doing the calculations). Use a 0.05 level of signicance