In research sponsored by Coca-Cola, 12,500 people were asked what contributes most to their
happiness, and 77% of the respondents said that it was their family or partner. Is this an example of
an observational study or a designed experiment?
Observational study because the researchers imposed a treatment
Observational study because the researchers did NOT impose a treatment
Designed experiment because the researchers imposed a treatment
Designed experiment because the researchers did NOT impose a treatment
Which of the following statements about the interquartile range (IQR) are true?
The IQR is zero only when all of the observations in the data set are the same value.
The IQR represents the range of the middle 50% of observations in a data set.
The IQR is affected by outliers in a distribution.
Sandy has an average bowling score of 180 and bowls in a league where the average for all bowlers
is 150 and the standard deviation is 20. Chantel has an average bowling score of 190 and bowls in a
league where the average is 160 and the standard deviation is 15. Who is the better bowler relative to
the rest of her league, Sandy or Chantel?