A sample mean, sample size, and sample standard deviation are provided below. Use the one-mean t-test to perform the required hypothesis test at the 5% significance level.

x=31, s=4, n=15, H0: μ=27, Ha: μ>27

The test statistic is t______ (Round to two decimal places as needed.)

Identify the critical value(s). Select the correct choice below and fill in the answer box within your choice.(Round to three decimal places as needed.)

A- The critical value is -tα=_____ 

B- The critical values are values are ±tα/2=±_______

C- The critical value is value is tα=________.

(Reject or do not reject) The null hypothesis. The data (provide or do not provide) sufficient evidence to conclude that the mean is ( greater than 27,not equal to 27,less than 27,equal to 27)