Questions from Business Statistics

Q: At a barbershop music singing competition, choruses are judged on three

At a barbershop music singing competition, choruses are judged on three scales: Music (quality of the arrangement, etc.), Performance, and Singing. The scales are supposed to be independent of each ot...

Q: A regression of the calories in breakfast cereals on their carbohydrate content

A regression of the calories in breakfast cereals on their carbohydrate content (g) looks like this: Response variable is: calories A second regression with fiber content included gives this model: Re...

Q: The first Stat exam had a mean of 80 and a standard

The first Stat exam had a mean of 80 and a standard deviation of 4 points; the second had a mean of 70 and a standard deviation of 15 points. Reginald scored an 80 on the first test and an 85 on the s...

Q: A 1954 study of 1438 pregnant women examined the association between the

A 1954 study of 1438 pregnant women examined the association between the woman education level and the occurrence of unplanned pregnancies, producing these data: Do these data provide evidence of an a...

Q: Cereals with bran Exercise R6.41 looked at regressions to model

Cereals with bran Exercise R6.41 looked at regressions to model calories in breakfast cereals based on their carbohydrates and fiber content. Here is a scatterplot of carbohydrates vs. fiber content f...

Q: We saw in Part II Review Exercise R2.21 that Old

We saw in Part II Review Exercise R2.21 that Old Faithful eruptions do not occur at constant intervals and the intervals may vary greatly depending on the duration of the previous eruption. In that ex...

Q: Are good grades in high school associated with family togetherness? A

Are good grades in high school associated with family togetherness? A Simple Random Sample of 142 high-school students was asked how many meals per week their families ate together. Their responses pr...

Q: Developers of a new math curriculum called Accelerated Math compared performances

Developers of a new math curriculum called Accelerated Math compared performances of students taught by their system with control groups of students in the same schools who were taught us...

Q: According to an article in the Journal of Consulting and Clinical Psychology

According to an article in the Journal of Consulting and Clinical Psychology, Charles Borduin pioneered a treatment called Multisystemic Therapy (MST) as a way to prevent serious mental health problem...

Q: Peninsula Creameries sells both cottage cheese and ice cream. The CEO

Peninsula Creameries sells both cottage cheese and ice cream. The CEO recently noticed that in months when the company sells more cottage cheese, it seems to sell more ice cream as well. Two of his ai...