A random sample is one on which the
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A random sample is one on which the
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- A study was commissioned to find t the residents in certain town. The s random sample of 114 residents andPeople who work out vigorously for an hour or more experience loss of electrolytes such as calcium, potassium, and sodium that are released from the body by sweat. Potassium is a very important part of many bodily functions for athletes, including transmitting nerve signals and fluid balance. A random sample of 9 athletes were given water after a vigorous one-hour workout and their electrolytes were then checked and recorded. After another vigorous one-hour workout on a different day, the same 9 athletes’ electrolytes were checked after being given a sports drink. Their potassium levels are given below. Do sports drinks help replenish lost potassium levels more than water after a vigorous workout? Refer to the table below. Water: 4.17, 2.88, 4.71, 4.79, 5.11, 4.12, 3.95, 4.22, 3.86 Sports Drink: 4.20, 3.30, 4.69, 4.82, 5.17, 4.08, 4.49, 4.54,3.71 hypothesis test needed Hypothesis test neededNone
- A fitness course claims that it can improve an individual's physical ability. To test the effect of a physical fitness course on one's physical ability, the number of sit-ups that a person could do in one minute, both before and after the course, was recorded. Ten individuals are randomly selected to participate in the course. The results are displayed in the following table. Can it be concluded, from the data, that participation in the physical fitness course resulted in significant improvement? Let d=(number of sit-ups that can be done after taking the course)−(number of sit-ups that can be done prior to taking the course)d=(number of sit-ups that can be done after taking the course)−(number of sit-ups that can be done prior to taking the course). Use a significance level of α=0.05α=0.05 for the test. Assume that the numbers of sit-ups are normally distributed for the population both before and after taking the fitness course. Sit-ups before 4242 4242 2323 3232 3030 4242 2525 4747…About 3% of the population has a particular genetic mutation. 700 people are randomly selected.Find the mean for the number of people with the genetic mutation in such groups of 700. (Round to 2 decimal places if possible.)ch12-15. If there are 46 data points in a set of data, what is the number of degrees of freedom? (Enter an exact number as an integer, fraction, or decimal.)
- Three university administer the same comprehensive examination to the receipients of MS degree in Business Statistics. From each institution, a random sample of MS receipients was selected, and these receipients were then given to the exam. The following tabel shows the scores of each student from the three universities Uni A Uni B Uni C 89. 60. 81 95. 95. 70 75 89 90 92 80 78 99 66 77 At a= 0.01 , test to see if there is a significant difference in the average scores of students from the three universities Answer needed ASAP.About 7% of the population has a particular genetic mutation. 100 people are randomly selected. Find the mean for the number of people with the genetic mutation in such groups of 100. (Round to 2 decimal places if possible.)Two different blood pressure medicines are being compared to determine if the average reduction in blood pressure is the same for each medication. The goal of the study is to determine if the medications differ. Twenty men age 50-60 years old are selected for the study. Ten men are chosen at random to receive the first medication and the other 10 men receive the second medication. Each of the 20 men is monitored for one month to determine the change in blood pressure over that time. Minitab provides the 95% confidence interval for (mu1 - mu2) (2.63, 14.18) a. Interpret this 95% CI. b. What assumptions (be specific) are necessary to construct this CI?
- If the 2412 leaves are not a random sample, but the researchers treated the 2412 leaves as a random sample, this most likely made the data more: accurate, but not precise precise, but not accurate neither both accurate and preciseA team of researchers would like to determine whether the number of households that use the internet for more than an hour a day is greater in large cities or small towns. To do so, the researchers take two random samples. The first sample consists of randomly selected people who live in cities with more than 500,000 people around the country. The second sample consists of randomly selected people who live in towns with fewer than 20,000 people. Are these samples dependent or independent? Select the correct answer below: O These samples are independent. O These samples are dependent. Not enough information is provided to determine independence.According to the financial reports by Snapchat, the average daily user of Snapchat created 19 messages, or "snaps," per day in Q3 2017. A college student wants to find out if the number of Snapchat messages has changed since Q3 2017 and creates a random sample using information from students on her campus for the current semester, with the accompanying results.
