The tensile strength of steel rods produced by a manufacturer has a mean of 31MPa and the standard deviation of 1.5MP.. By a new technique in the manufacturing process , it is claimed that the tensile...

Extracted text: The tensile strength of steel rods produced by a manufacturer has a mean of 31MPa and the standard deviation of 1.5MP.. By a new technique in the manufacturing process , it is claimed that the tensile strength can be improved. To test this claim, a sample of 48 steel bars is tested and it is found that the mean tensile strength is 31.5 can we support the claim at 0.05 level of significance? Click this link for Normal table: https://drive.google.com/drive/folders/10Vh9sXNIrDwbusps0Mz3b6VsztZsl3Tq? usp=sharing (If your hypothesis HO: µ= 31 and H1 : µ > 31 then write 1 in the answer box. Example: 1 If your hypothesis HO: µ = 31 and H1 : µ< 31="" then="" write="" 2="" in="" the="" answer="" box).="" example:="" 2="" (a)="" hypothesis="" :="" (b)="" critical="" value="" of="" z="(" example:="" 8.53)="" (c)="" test="" statistic="" or="" calculated="" value="" of="" z="(Example:" 9.123)="" (d)="" decision="" is="">