Gail, a baker, claims that her bread height is not equal to 14 cm, on average. Several of her customers do not believe her, so she did a did a hypothesis test, at a 5% significance level, to persuade them. She bakes 15 loaves of bread. The mean height of the sample loaves is 13.8 cm. Gail knows from experience that the standard deviation for her bread height is 0.7cm.

• :;:
• (significance level)

What is the test statistic (-score) of this one-mean hypothesis test, rounded to two decimal places?