Good afternoon I need help with this problem I didn’t get the right answer after my test results I n

Good afternoon I need help with this problem I didn’t get the right answer after my test results I need to know step by step, thank you so much for the help

A soft drink manufacturer claims that its 12 ounce cans do not contain, on average more than 30 calories a random sample of 16 cans of this soft drink, which were checked for calories contained a mean of 31.8 calorie with a standard deviation of 3 calories. Assume that the number of calories in the 12 ounce cans is normally distributed. Test the manufacturer’s claim at the 5% significance level

 

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