The next five births at a hospital all being boys
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The next five births at a hospital all being boys.
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- A surgeon would like to know how long it takes, on average, to complete a coronary artery bypass surgery. She samples 26 surgeries and logs the time it takes to complete each one, in hours: 5.2, 4.9, 3.9, 3.6, 5.6, 5, 4.5, 7, 4.5, 5.4, 5.1, 5.4, 5.2, 5.2, 4.1, 6.5, 6.7, 5.9, 5.4, 5.4, 5.8, 4.3, 4.7, 3.7, 5.4, 3.9 Assuming the population standard deviation is o the average time it takes to complete a coronary artery bypass surgery. 0.84, construct a 87% confidence interval for Margin of Error: E = We are 87% confident that the mean amount of time it takes to complete a coronary bypass sugery hours. hours and is between Question Help: D Post to forum20 out of 800 products were found to be defective. At the same rate, how many defective parts will be found in 40,000 products?An epidemiologists is studying two populations that have recently had an outbreak of a disease with similar symptoms. In one population of 600 people, 450 of them became infected and 3 of them died. In the other population of 200 people, 20 were infected and 10 died. Did the two towns have an outbreak of the same disease? Defend your answer. Use prevalence and mortality rates to help you.
- A researcher was interested in how much longer the heart rate recovery time is for untrained college students compared to athletically trained college students. Eleven athletically untrained college students and nine athletically trained college students were put on a treadmill for fifteen minutes and then tested to see how many minutes it took for their heart rates to return to normal. The results of the study are shown below. Untrained: 8, 7, 7.2, 6.9, 7.8, 8.8, 8, 8, 8.8, 7.3, 8.6 Trained: 1.5, 1.5, 1.8, 2, 1.9, 2.3, 2.3, 2.4, 2.2 Assume both follow a Normal distribution. Compute the 95% confidence interval for the difference. Round to one decimal place. ( ___________ , _____________ )Find the probability of getting a 2, 4, 5, or 6 when you roll a standard six-sided dieIn a certain coffee shop, each customer orders exactly one cup of coffee, and 60% of customers order latte. Estimate the probability of selling more than 25 cups of latte to the next 50 customers.
- Suppose you play a game where you roll 2 six-sided dice. If you roll a 7, you will lose some money, but if you roll anything else you will win 100. How much money would you have to lose in order for you average 0 per roll?Suppose the prevalence of "dance fever" at a college is 40% among women and 10% among men. If there are half as many men as women, what is the overall prevalence of dance fever at the college? What proportion of people without dance fever at that college are women?Out of all families with 4 children, you select one family at random. What are the chances that the family you select has exactly 3 boys? Enter your answer as a decimal rounded to three decimal places (if necessary).
- The amount of contaminants that are allowed in food products is determined by the FDA (Food and Drug Administration). Common contaminants in cow milk include feces, blood, hormones, and antibiotics. Suppose you work for the FDA and are told that the current amount of somatic cells (common name "pus") in 1 cc of cow milk is currently 750,000 (note: this is the actual allowed amount in the US!). You are also told the standard deviation is 62000 cells. The FDA then tasks you with checking to see if this is accurate. You collect a random sample of 45 specimens (1 cc each) which results in a sample mean of 762004 pus cells. Use this sample data to create a sampling distribution. Assume that the population mean is equal to the FDA's legal limit and see what the probability is for getting your random sample. a. Why is the sampling distribution approximately normal? b. What is the mean of the sampling distribution? c. What is the standard deviation of the sampling distribution? d. Assuming…Ethan has a bag that contains strawberry chews, apple chews, and lime chews. He performs an experiment. Ethan randomly removes a chew from the bag, records the result, and returns the chew to the bag. Ethan performs the experiment 47 times. The results are shown below: A strawberry chew was selected 36 times. A apple chew was selected 9 times. A lime chew was selected 2 times. If the experiment is repeated 600 more times, about how many times would you expect Ethan to remove a lime chew from the bag? Round your answer to the nearest whole number.According to a report published by the center for Disease Control (CDC) in 2011, approximately one in two people with asthma had an asthma attack in2008.
