Assignment Task
Hypothesis testing I: are our customers’ ratings significantly higher than normally presumed?
We’ve known that customer ratings of our service quality have been on average 7.2 out of 10 in the last several years. However, has the new training we introduced at the end of last year worked to significantly increase customer rating?
We did an investigation that involves a ____ -tailed test. Therefore, the Ho and Ha are:
Ho: µ = 7.2 points
Ha: µ > 7.2 points
What the hypotheses are saying is that there are two possibilities: either customer rating is still the same (7.2 points on average), or is now significantly higher than 7.2 points.
To investigate this, I sampled _________________________________________________ …
The sample mean and standard deviations are ___________________________________ …
The critical t-score is _____________ and the calculated t-score is _______________________,
based on the following calculations …
Comparing the calculated and critical t-scores, I do not reject the Ho because the calculated t-score is ______ than the _________________.
I therefore conclude that as a business, we should take the following action: __________________
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