21. The hourly wages of a group of workers has median $ 21, the first quartile $17 and third quartile $ 27. The four lowest paid workers had wages $4, $5, $8, $9, and the three highest paid workers had wages $29, $32, $33. Based on the 1.5 x IQR rule, how many outliers are there in this data set of hourly wages? no outliers only one outlier only two outliers e only three outliers more than three outliers19. Researchers at the Universities of Memphis, Alabama at Birmingham, and Tennessee investigated the relationship between insomnia and education status. A random-digit telephone dialing procedure was used to collect data on 575 study participants. In addition to insomnia status (normal sleeper or chronic insomniac), the researchers classified each participant into one of the four education categories (college graduate, some college, high school graduate, and high school dropout). They measured each participant's daytime functioning, which is called Fatigue Severity Scale (FSS). The data were analyzed. The result of this study indicated that the fewer years of education, the more likely the person was to have chronic insomnia. Determine the number of treatments for this study. Co C) co 20. The Test of English as a Foreign Language Skills (TOEFL) scores are approximately normally distributed with a mean of 540 and standard deviation of 60. A person received a score that was in the 80th percentile of everyone who took the exam (This means 80% of the scores are below this person's score). This person's score must be: 540 590 2 = 2 - M 552 620 0:80 = 2 - 540 M - 54123. Which of the following statements about the correlation coefficient is/are true? I) The correlation coefficient and the slope of the regression must have the same sign. i.e It is not possible to have one of them positive and the other negative. II) A correlation of 1.0 indicates a perfect cause-and-effect relationship between the variables. III) Correlations of +0.9 and -0.9 indicate the same degree of clustering around the regression line. (a) Only statement I is true (b) Only statement II is true (C ) Only statement III is true (d) Only statements I and III are true (e) All three statements (i.e. I, II and III) are true