This is the result of a matched pairs t test, to test if childrens maths scores have decreased.

P-value is 1, does this mean that there is absolutely no change in scores, or just that the hypothesis that μ is equal to 0 cannot be rejected.

I'm so confused, what would you conclude?

Output below:

Hypothesis test results:

μ : mean of Variable

Ho : μ = 0

Ha : μ < 0

Sample Mean: 6.78

Std. Err: 0.9084986

DF: 99

T-Statistic: 7.4628625

P-value: 1