43. 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 educa- tion, the more likely the person was to have chronic insomnia. Identify the response variable(s) for this study. (a) Education, Insomnia ( b ) Education, Insomnia, FSS (c) FSS ( d) Insomnia (e) FSS, Insomnia 44. A newspaper wants to determine whether its readers believe that government expen- ditures should be reduced by cutting benefits for the people with disabilities. They provide an Internet address for readers to vote yes or no. Based on 1434 Internet votes, they reported that 93% of the city's residence believe that benefits should be reduced. Identify the type of sampling used in this study? a) Representative sampling (b) Probability Sampling (C) Stratified sampling (d) Cluster sampling (e) Volunteer sampling 2750. A survey is conducted regarding a proposed change to exam policy in a statistics class at a school. The table below shows the results of the survey by year of the student first, second and third year) and whether they are in favour, against, or undecided about the change. In favour Against Undecided |Total First Year 32 16 10 58 Second Year 24 12 28 64 Third Year 50 3 2 55 Total 106 31 40 177 At this school, first and the second year students are called junior undergraduates and the third and fourth year students are called senior undergraduates. (This statistics class did not have any fourth year students) What percentage of all junior undergrad- uates are against the change to exam policy? (a) 23 percent (b) 90 percent (c) 16 percent ( d ) 46 percent (e) 50 percent END OF EXAM48. According to the U.S. Bureau of the Census, the 2013 mean earnings in the past 12 months were $31,968 for females and $50,779 for males. The results refer to 110 million females and 109 million males. Find the overall mean. Hint: Find the weighted average and use nfemales = 110, nmales = 109 in your calcula- tion. (a) $41,374 (b) $41,331 (c) $32,200 (d) $31,968 (e) $50,779 49. Green sea turtles have normally distributed weights with a mean 134.3 kg and standard devistion 7 kg. A particular green sea turtle's weight has a z-score of 1.2. What is the weight of this green sea turtle? Round to the nearest whole number. (a) 143 kg (b) 126 kg (c) 136 kg (d) 133 kg (e) 141 kg5. Agricultural scientists are working on developing an improved variety of Roma toma- toes. Marking research indicated that customers are likely to bypass Romas that weigh less than 70 grams. The current variety of Roma plants produce fruit that average 74 grams, but 11% of the tomatoes are too small. It is reasonable to assume that a normal model applies. What is the standard deviation of weights of Romas now being grown? 3.25 alidad 1.23 P = 0.11