Questions from Statistics

Q: Using the information from exercise 12.3, write two headlines

Using the information from exercise 12.3, write two headlines announcing the results of the study. Make one of the headlines imply causality and make the other one not imply causality. Clearly label e...

Q: Using the information from exercise 12.4, write two headlines

Using the information from exercise 12.4, write two headlines announcing the results of the study. Make one of the headlines imply causality and make the other one not imply causality. Clearly label e...

Q: In a 2018 study reported in The New England Journal of Medicine

In a 2018 study reported in The New England Journal of Medicine, Halpern et al. randomly assigned smokers to one of five groups, including four smoking cessation interventions and usual care. Usual ca...

Q: In a 2018 study reported in The Lancet, a randomized,

In a 2018 study reported in The Lancet, a randomized, double-blind controlled experiment was conducted to determine the effect of the drug upadacitinib on patients with active rheumatoid arthritis. Pa...

Q: One of the histograms is a histogram of a sample (from

One of the histograms is a histogram of a sample (from a population with a skewed distribution) one is the distribution of many means of repeated random samples of size 5, and one is the distribution...

Q: According to home-water-works.org, the average

According to home-water-works.org, the average shower in the United States lasts 8.2 minutes. Assume this is correct, and assume the standard deviation of 2 minutes. a. Do you expect the shape of the...

Q: Fill in the blank by choosing one of the options given:

Fill in the blank by choosing one of the options given: Chi-square goodness-of-fit data are often summarized with ____________ (one row or one column of observed counts—but not both, or at least two r...

Q: Fill in the blank by choosing one of the options given:

Fill in the blank by choosing one of the options given: Chi-square goodness-of-fit tests are applicable if the data consist of ___________ (one categorical variable, two categorical variables, one num...

Q: Consider the data from the happiness survey (see exercise 11.

Consider the data from the happiness survey (see exercise 11.40). If you do a series of two-sample t-tests comparing mean happiness of all pairs of the seven age groups, you will find that the p-value...

Q: Suppose you collect data on GPAs by classroom row in which the

Suppose you collect data on GPAs by classroom row in which the student chose to sit, and that there are four rows. Suppose you do multiple two-sample t-tests to compare the mean GPA of the rows, and d...