Questions from Statistics

Q: Very late onset schizophrenia affects people who are at least 60 years

Very late onset schizophrenia affects people who are at least 60 years old. In a 2018 study reported in The Lancet Psychiatry, researchers conducted a double-blind controlled experiment to study the e...

Q: Harvard Women’s Health Watch reported on a 2016 study on the association

Harvard Women’s Health Watch reported on a 2016 study on the association between various forms of exercise and health. In this study, researchers used data from large British and Scottish health studi...

Q: An April 2017 headline from the nytimes.com said “Sugary

An April 2017 headline from the nytimes.com said “Sugary Drinks Tied to Accelerated Brain Aging.” Is this headline more likely to refer to a controlled experiment or an observational study? Explain.

Q: Imagine two studies of an exercise program that designers claim will make

Imagine two studies of an exercise program that designers claim will make people lose weight. The first study is based on a random sample of 100 men and women who follow the exercise program for 6 mon...

Q: The distribution of the scores on a certain exam is N(

The distribution of the scores on a certain exam is N(100, 10) which means that the exam scores are Normally distributed with a mean of 100 and a standard deviation of 10. a. Sketch or use technology...

Q: Smiling is a sign of a good mood, but can smiling

Smiling is a sign of a good mood, but can smiling improve a bad mood? Researchers plan to assign subjects to two groups. Subjects in both groups will rate their mood at the beginning of the study. The...

Q: The following two headlines concern the same topic. Which one has

The following two headlines concern the same topic. Which one has language that suggests a cause-and-effect relationship, and which does not? Headline A: “Women Who Drink Coffee Are Less Prone to Depr...

Q: In a 2018 study, researchers investigated the effect of the drug

In a 2018 study, researchers investigated the effect of the drug alteplase in the treatment of stroke patients (Thomalla et al. 2018). Patients were randomly assigned to receive intravenous alteplase...

Q: In a 2017 study reported in The American Journal of Medicine,

In a 2017 study reported in The American Journal of Medicine, Sophocleous et al. studied 170 adults who smoked marijuana regularly and 114 adults who had never used the drug and found that people who...

Q: In a 2018 study reported in Child Development, Ballard et al

In a 2018 study reported in Child Development, Ballard et al. examined links between civic engagement (voting, volunteering, and activism) during late adolescence and early adulthood, and socioeconomi...