UPDATED VERSION Page |3 Z Test and T Test Determine which hypothesis test to use, and then carry out the 9 steps of the hypothesis testing procedure. Question 3: n = 10 U=$7,5 A manufacturer claims that the thickness of the spearmint gum it produces is 7.5 one- hundredths of an inch. A quality control specialist regularly checks this claim. On one production run, he took a random sample of N = 10 pieces of gum and measured their thickness. Test the manufacture's claim by testing to see if there is a difference between the population mean and the sample mean Gum's Thickness ( Thickness) OR X - Mean (X - Mean)2 ID# X X2 #1 7.65 58.5225 0.1 0.01 #2 7.60 57.76 OR 0.05 0.0025 # 3 7.65 58.5225 0.1 0.01 #4 7.70 59.29 0.15 0.0225 #5 7.55 57.0025 OR 0 0 #6 7.55 57.0025 0 #7 7.40 54.76 -0.15 0.0225 #8 7.40 54.76 OR -0.15 0.0225 #9 7.50 56.25 -0.05 0.0025 #10 7.50 56.25 -0.05 0.0025 Totals EX = EX2 = E(X - Mean)? = 75.5 570.12 0.095 2% (Confidence Level) Reject Ho Fail to Reject Ho Reject Ho a/2= 1/2=