MKTCO recently adopted the ISO 9001 quality management standards to improve product quality. A MKTCO manager wants

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Question:

MKTCO recently adopted the ISO 9001 quality management standards to improve product quality. A MKTCO manager wants to know if customers have already seen an improvement in the quality of MKTCO products. From 2015 to 2021, customer ratings of product quality (Quality) averaged 5.01 on a 1-10 scale. Use a one-sample t-test to compare the current Quality ratings from the sample of customers in this MKTCO survey to the historical average of 5.01.

Quality

4
5
6
7
6
5
4
5
5
5
5
5
6
6
6
6
6
6
5
5
7
6
6
6
6
6
6
6
5
4
7
6
5
5
6
6
6
6
5
5
4
4
5
7
5
6
6
6
5
5
5
5
6
6
5
6
6
6
6
6
7
5
5
6
6
5
7
5
5
5
7
5
4
7
5
7
8
7
6
6
5
6
6
7
6
4
4
6
6
7
7
5
6
6
5
5
4
5
6
5
6
6
5
3
6
5
6
6
3
5
6
7
7
5
7
5
6
5
5
5
6
5
6
6
5
5
6
7
7
5
7
5
6
6
5
6
4
6
6
6
5
5
7
5
6
4
5
5
5
6
7
4
4
8
6
4
6
6
7
7
6
8
6
5
5
6
6
6
6
6
5
6
6
6
5
6
6
7
5
5
6
5
6
6
5
4
4
4
7
5
6
4
4
6
3
6
4
6
4
6
5
6
4
6
7
7
6
6
8
7
6
4
6
7
6
6
5
8
6
5
5
6
7
6
6
5
5
6
6
5

1. What is the null hypothesis of this t-test? What is the alternative hypothesis of this t-test?

2. Are the product quality ratings this year significantly higher, significantly lower, or equal to the historical average of 5.01? Explain your answer.