Find the value of the standard score, z, and determine whether to reject the null hypothesis at a 0.05 significance level. Is the alternative hypothesis supported? Ho: μ = 4.50 grams, H₂: μ> 4.50 grams, n = 121, x= 7.50 grams, o = 2.50 grams The value of the standard score is Round to two decimal places as needed.) The critical value(s) is/are. Use a comma to separate answers as needed. Round to two decimal places as needed.) Determine whether the alternative hypothesis is supported at a 0.05 significance level.