Questions from Business Statistics

Q: Are there differences in airfare depending on which travel agency website you

Are there differences in airfare depending on which travel agency website you utilize? The following data were collected on travel agency websites on July 9, 2018. The following table contains the pri...

Q: The Scholastic Aptitude Test (SAT) contains three areas: critical

The Scholastic Aptitude Test (SAT) contains three areas: critical reading, mathematics, and writing. Each area is scored on an 800-point scale. A sample of SAT scores for six students follows. a. Us...

Q: In 2018, consumer goods giant Procter and Gamble (P&

In 2018, consumer goods giant Procter and Gamble (P&G) had more than 20 brands with more than $1 billion in annual sales (P&G website, https://us.pg.com/). How does a company like P&G crea...

Q: A factorial experiment involving two levels of factor A and three levels

A factorial experiment involving two levels of factor A and three levels of factor B resulted in the following data. Test for any significant main effects and any interaction. Use α =...

Q: The calculations for a factorial experiment involving four levels of factor A

The calculations for a factorial experiment involving four levels of factor A, three levels of factor B, and three replications resulted in the following data: SST = 280, SSA = 26, SSB = 23, SSAB = 17...

Q: Refer to exercise 2. a. What hypotheses are implied

Refer to exercise 2. a. What hypotheses are implied in this problem? b. At the α = .05 level of significance, can we reject the null hypothesis in part (a)? Explain. Exercise 2: In a co...

Q: Based on a 2018 study, the average elapsed time between when

Based on a 2018 study, the average elapsed time between when a user navigates to a website on a mobile device until its main content is available was 14.6 seconds. This is more than a 20% increase fro...

Q: An amusement park studied methods for decreasing the waiting time (minutes

An amusement park studied methods for decreasing the waiting time (minutes) for rides by loading and unloading riders more efficiently. Two alternative loading/unloading methods have been proposed. To...

Q: As part of a study designed to compare hybrid and similarly equipped

As part of a study designed to compare hybrid and similarly equipped conventional vehicles, Consumer Reports tested a variety of classes of hybrid and all-gas model cars and sport utility vehicles (SU...

Q: A simple random sample of 800 elements generates a sample proportion p̅

A simple random sample of 800 elements generates a sample proportion p̅ = .70. a. Provide a 90% confidence interval for the population proportion. b. Provide a 95% confidence interval for the populati...