Spoints it'd 5 Which of the following distributions would you expect to be fairly normally distributed (symmetric). Number of alcoholic drinks consumed by college students in a given week. Assume that most of these students don't drink since they are under 21 years old, and only a few drink excessively. Housing prices in a country where 25% of the houses cost below $300,000, 50% of the houses cost below $600,000, 75% of the houses cost below $900,000 and very few houses that cost more than $1,200,000. Housing prices in a country where 25% of the houses cost below $350,000, 50% of the houses cost below $450,000, 75% of the houses cost below $1,000,000 and there are a meaningful number of houses that cost more than $6,000,000. Annual salaries of the employees at a Fortune 500 company where only a few high level executives earn much higher salaries than all the other employees. n Spoints E 9 Researchers studying the effect of antibiotic treatment for acute sinusitis compared to symptomatic treatments randomly assigned 166 adults diagnosed with acute sinusitis to one of two groups: treatment or control. Study participants received either a 10-day course of amoxicillin (an antibiotic) or a placebo similar in appearance and taste. The placebo consisted of symptomatic treatments such as acetaminophen, nasal decongestants, etc. At the end of the 10-day period, patients were asked if they experienced improvement in symptoms. The distribution of responses is summarized below. Group Self-reported improvement in symptoms Yes No Total Treatment 66 19 85 Control 65 16 81 Total 131 35 166 What percentage of patients in the control group experienced improvement in symptoms? 78% 79% 80% 40% 7 4 points Suppose you want to estimate the percentage of videos on You Tube that are cat videos. It is impossible for you to watch all videos on You Tube so you use a random video picker to select 1000 videos for you. You find that 2% of these videos are cat videos. Determine which of the following is an observation, a variable, a sample statistic (value calculated based on the observed sample), or a population parameter. Whether or not a video is a cat video Observation Percentage of all videos on You Tube that are cat videos Variable A video in your sample Sample statistic (proportion) Population parameter (proportion) 2% Zpoints A recent article in a college newspaper stated that college students get an average of 5.5 hrs of sleep each night. A student who was skeptical about this value decided to conduct a survey by randomly sampling 25 students. On average, the sampled students slept 6.25 hours per night. Identify which value represents the sample mean and which value represents the claimed population mean. 6.25 hours of sleep a night m Sample Mean 5.5 hours ofsleepa night { ' Population Mean n Spoints > Researchers studying the effect of antibiotic treatment for acute sinusitis compared to symptomatic treatments randomly assigned 166 adults diagnosed with acute sinusitis to one of two groups: treatment or control. Study participants received either a 10-day course of amoxicillin (an antibiotic) or a placebo similar in appearance and taste. The placebo consisted of symptomatic treatments such as acetaminophen, nasal decongestants, etc. At the end of the 10-day period, patients were asked if they experienced improvement in symptoms. The distribution of responses is summarized below. Group Self-reported improvement in symptoms Yes No Total Treatment 66 19 85 Control 65 16 81 Total 131 35 166 Which treatment, without doing any further analysis, seems to be more effective? There is no difference between the placebo and amoxicillin treatments The amoxicillin The placebo