answer a question

20. Twitter Poll The Pew Research Center conducted a survey of 1007 adults and found that 856 of them know what Twitter is. Use a 0.01 significance level to test the claim that more than 75% of adults know what Twitter is. 32. HDTV Penetration In a survey of 1500 households, it is found that 47% of them have a high-definition television (based on data from the Consumer Electronics Association). Use a 0.01 significance level to test the claim that fewer than half of all households have a high- definition television. Is the result from a few years ago likely to be valid today? PAGE 11710:35 Math 110 Module Update... 12. Plane Seats In a 3M Privacy Filters poll, 806 adults were asked to identify their favorite seat when they fly, and 492 of them chose a window seat. Use a 0.01 significance level to test the claim that the majority of adults prefer window seats when they fly. 18. Perception and Reality In a presidential election, 308 out of 61 1 voters surveyed said that they voted for the candidate who won (based on data from ICR Survey Research Group). Use a 0.10 significance level to test the claim that among all voters, the percentage who believe that they voted for the winning candidate is equal to 43%, which is the actual percent- age of votes for the winning candidate. What does the result suggest about voter perceptions? PAGE 1168. Public Speaking A TNS poll of 1000 randomly selected adults showed that 460 of them say that public speaking is an activity that they dread most. Shown next is the StatCrunch display resulting from a test of the claim that fewer than half of adults say that public speaking is the activity that they dread most. STATCRUNCH Hypothesis test results: p : proportion of successes for population Ho : p = 0.5 HA: P 7/8, the test statistic is z = 2.88. Stating Conclusions. In Exercises 25-28, assume a significance level of a = 0.05 and use the given information for the following: a. State a conclusion about the null hypothesis. (Reject Ho or fail to reject Ho.) b. Without using technical terms, state a final conclusion that addresses the original claim. 26. Original claim: Fewer than 20% of M&M candies are green. The hypothesis test results in a P-value of 0.0721. PAGE 109Math 110 Module Update... Q Lab Assignment Name: Sections 8.1 Due Date: Math 34 This Lab is to be worked in the Math Lab when an instructor is present. You may work with your classmates, but be sure to complete your own assignment to turn in. To receive credit for this assignment you must log in at least 2 hours each week. Stating Conclusions About Claims. In Exercises 5-8, do the following: a. Express the original claim in symbolic form. b. Identify the null and alternative hypotheses. 5. Claim: 20% of adults smoke. A recent Gallup survey of 1016 randomly selected adults showed that 21% of the respondents smoke. 6. Claim: When parents use the XSORT method of gender selection, the proportion of baby girls is greater than 0.5. The latest actual results show that among 945 babies born to couples using the XSORT method of gender selection, 879 were girls. 8. Claim: The standard deviation of pulse rates of adult women is at least 50. For the random sample of adult females in Data Set 1 from Appendix B, the pulse rates have a standard devia- tion of 1 1.6. PAGE 108