If LaTeX: z_{obt}z o b t= +2.21, do you reject LaTeX: H_0H 0 or fail to reject LaTeX: H_0H 0 using a one-tailed test in the upper tail with α = .05? Why do you make that choice? Note: Be sure to type in the correct answer in the space provided here.

Reject the null hypothesis

Step-by-step explanation:

From the question we are told that

   The test statistic is  

    The level of significance is  

Given that this a one tailed in the upper tail then from the z table the area under the normal  curve to the right  corresponding to is

So the p-value  is

From the values obtained we see that    hence

The decision rule

 Reject the null hypothesis

what is the original number? you forgot to add it.