A Supermarket Has Just Added a New Cash Register to Reduce

question 87

Essay

A supermarket has just added a new cash register to reduce the waiting times of the customers during weekends.Since a new cash register is added,the customers expect that their waiting time will be less than the waiting time before the cash register was added.Suppose the sample variance of the waiting times for 25 customers before adding the new cash register is = 4.8 minutes,while the sample variance of the waiting times for 25 customers after adding the cash register is = 2.2 minutes.The manager of the supermarket believes that the waiting times are normally distributed and that the two samples are drawn independently.
A)Develop the hypotheses to test whether the ratio of two population variances is less than 1.
B)Calculate the appropriate test statistic.
C)Using the p-value approach,determine the decision rule at the 5% significance level.
D)What is the conclusion? Given that all other criteria are satisfied,should the supermarket continue with the new cash register?

• A)Develop the hypotheses to test whether the ratio of two population variances is less than 1.
• B)Calculate the appropriate test statistic.
• C)Using the p-value approach,determine the decision rule at the 5% significance level.
• D)What is the conclusion? Given that all other criteria are satisfied,should the supermarket continue with the new cash register?

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Definitions:

Food allergies

An immune system response that occurs soon after eating a certain food, causing various symptoms which can range from mild to severe.

Aversion to foods

A strong dislike or disinclination towards certain foods, often due to taste, texture, or past negative experiences.

Unhealthy appetite

An abnormal or excessive desire for food or substances that can negatively affect one's health.

Breach of Contract

The act of not adhering to any stipulation of a contract, either written or verbal, in the absence of a legitimate legal excuse.