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- How many different signals can be sent, when three flags are used, if two of the 9 flags are missing?Suppose the probability of incorrectly transmitting a single bit is . Compute the probability of correctly receiving a -word coded message made up of -bit words.A bag of 100 tulip bulbs purchased from a nursery contains 40 red tulip bulbs, 35 yellow tulip bulbs, and 25 purple tulip bulbs. If 100 tulip bulbs were sampled with replacement, one would expect about of the bulbs to be red and about of the bulbs to be purple
- A researcher wished to find out whether the perceptions of a persons height depends on that person’s perceived status. A random sample of army inductees was selected and equally divided into four groups. An actor gave a short address to each group separately, extollng the joys of army life. For the first group, the actor was dressed as a private; for the second, as a sergeant; for the third, as a captain, and, finally, for the fourth grup, as a Colonel. The inductees were asked to fill out a questionnaire evaluating the speech. Among the questions was one asking for an estimate of the lecturer’s height.IN A CITY 250 MEN OUT OF 750 WERE FOUND TO BE SMOKERS. DOES THIS INFORMATION SUPPORT THE CONCLUSION THAT THE MAJORITY OF MEN IN THIS CITY ARE SMOKERS?Thirty of the 198 students enrolled in Statistics 101 were asked if they wanted Exam II to be a or an assessment. Twenty, or about 67%, of the students polled indicated a preference for an exam. The professor concluded that the majority of students in Statistics 101 would prefer an examination for the second assessment. Did the professor perform a descriptive study or an inferential study?
- Suppose a group of 800 smokers (who all wanted to give up smoking) were randomly assigned to receive anA scientist is studying the relationship between stomach aches and headaches among students. On her survey, she asked if the participant had headaches that could be classified as “sudden,” “chronic,” or “none.” The survey also asked if the participant had stomach aches with answers of “yes” or “no.” From the survey she found: 14% have sudden headaches; 22% have chronic headaches; 15% have stomach aches; Of those with stomach aches, 1⁄3 have sudden headaches. Of those with no headaches, 1⁄8 have stomach aches. What is the probability that a randomly selected student from the survey did not have stomach aches, but they do have chronic headaches?Researchers conducted a study to find out if there is a difference in the use of online-learning by different age groups. Randomly selected participants were divided into two age groups. In the 16 to 29-year-old group, 7% of the 628 surveyed use online-learning, while 11% of the 2,309 participants 30 years old and older use online learning. (Set 1 for 16-29 year old group; Set 2 for 30 years old and older). Find X2.
- Thirty of the 198 students enrolled in Statistics 101 were asked if they wanted Exam II to be a or an assessment. Twenty, or about 67%, of the students polled indicated a preference for an exam. The professor concluded that the majority of students in Statistics 101 would prefer an examination for the second assessment. Did the professor perform a descriptive study or an inferential study? Select one: a. Inferential b. DescriptiveA survey of 500 students of a college, it was found that 49% like watching football, 53% like watching hockey and 62% like watching basketball. Also, 27% like watching football and hockey, 29% like watching basketball and hockey and 28% like watching football and basketball. 5.4% like watching none of the three games. How many students watching all three games?The permanent residence of adults aged 18-25 in the U.S. was examined in a survey from the year 2000. The survey revealed that 27% of these adults lived alone, 32% lived with a roommate(s), and 41% lived with their parents/guardians. In 2008, during an economic recession in the country, another such survey of 1600 people revealed that 398 lived alone, 488 lived with a roommate(s), and 714 lived with their parents. Is there a significant difference in where young adults lived in 2000 versus 2008 and state the p-value? Test with a Goodness of Fit test at α=0.05. Alone Roommates Parents/Guardians Observed Counts 398 488 714 Expected Counts 432 512 656
