Questions from Statistics Principles

Q: What does the 95% represent in a 95% confidence interval

What does the 95% represent in a 95% confidence interval?

Q: A researcher collects data regarding the percent of all births to unmarried

A researcher collects data regarding the percent of all births to unmarried women and the number of violent crimes for the 50 states and Washington, DC. The scatter diagram along with the least-square...

Q: For what proportion of samples will a 90% confidence interval for

For what proportion of samples will a 90% confidence interval for a population mean not capture the true population mean?

Q: What is the relationship between education and belief in Heaven? The

What is the relationship between education and belief in Heaven? The following data represent the highest level of education and belief in Heaven for a random sample of adult Americans. (a) Construct...

Q: The area under the t-distribution with 18 degrees of freedom

The area under the t-distribution with 18 degrees of freedom to the right of t = 1.56 is 0.0681. What is the area under the t-distribution with 18 degrees of freedom to the left of t = -1.56? Why?

Q: Consider the following contingency table, which relates the number of applicants

Consider the following contingency table, which relates the number of applicants accepted to a college and gender. (a) Construct a conditional distribution of acceptance status by gender. (b) What pro...

Q: Researchers wanted to determine whether the stomach shrinks as a result of

Researchers wanted to determine whether the stomach shrinks as a result of dieting. To do this, they randomly divided 23 obese patients into two groups. The 14 individuals in the experimental group we...

Q: Which is larger, the area under the t-distribution with

Which is larger, the area under the t-distribution with 10 degrees of freedom to the right of t = 2.32 or the area under the standard normal distribution to the right of z = 2.32? Why?

Q: State the properties of Student’s t-distribution.

State the properties of Student’s t-distribution.

Q: If the slope of a least-squares regression line is negative

If the slope of a least-squares regression line is negative, what could be said about the correlation between the explanatory and response variable?