A psycho-linguist has been studying the frequency of text-speech (e.g., R U OK?, LOL) has been progressing into EMAIL correspondence. He collects a sample
of 121 EMAIL messages and computes the mean (average) number of examples of text-speech per message. He also has a huge library of archived EMAIL
messages from the year 2001. From these he is able to calculate the population average and standard deviation. Compute a inferential statistic to evaluate the
hypothesis that the use of text-speech has increased in the years since 2001. Use an alpha level that would insure a maximum of a %5 risk of rejecting a true null
hypothesis.

These are the obtained values:
Population Mean from 2001:
1.6
Population Standard deviation from 2001: 1.25
Sample mean from this year.
1.98


Calculate and properly report your calculated statistic, and interpret your conclusion in one or two sentences.