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- A teacher was listening to some of her students talk about how many SnapChats they send during the day. The teacher decided that she wanted to conduct a study to see if the number of SnapChats a student sends per day affects how much time students talk to their friends face-to-face. So, the teacher let her 2nd period class continue sending Snaps as they always have. Then, the teacher told her 5th period that they were to not watch use SnapChat for a whole day. Then, the teacher had students record how many conversations they had with their friends during the week, gathered the data, and analyzed the results. What type of study is this? Experimental or observational?A USA Today poll asked a random sample of 1012 U.S. adults what they do with the milk in the bowl after they have eaten the cereal. Suppose that 70% of U.S. adults actually drink the cereal milk. Remember to check conditions and interpret your results into a sentence.An instructor for a test preparation course claims that the course will improve the test scores of students. The table shows the critical reading scores for 14 students the first two times they took the test. Before taking the test for the second time, the students took the instructor's course to try to improve their critical reading test scores. At a = 0.01, is there enough evidence to support the instructor's claim? Complete parts (a) through (f). Student Score on first test Score on second test 621 573 577 627 373 369 399 717 488 553 634 478 558 623 10 11 12 13 14 D 618 518 503 604 415 350 439 609 409 481 594 431 527 591 1 2 3 4 6 8 Identify the rejection region(s). Choose the correct answer below. O A. t 2.650 O B. t 3.012 OC. t3.012 (c) Calculate d and sd. d = - 35.786 (Type an integer or a decimal. Round to three decimal places as needed.) Calculate sd- Sa = 133.096 (Type an integer or a decimal. Round to three decimal places as needed.)
- need parts C and DFor this problem, assume that outcome O1has frequency 1/a, outcome O2 has frequency 10/a and outcome O3 has frequency 8/a What is the value of aA population of Emotional Quotient scores with μ = 38 and σ = 6 is standardized to create a new population with μ = 50 and σ = 10. Find the new score for a given original score or the old score for a given new score. original score new score X = 26 ? ? X = 65
- How many ways can you arrange the letters of ANTIDIFFERENTIATE if it must end with an E, and the R and the D must be adjacent to each other (RD or DR) ?A marketing firm wishes to test the effectiveness of the audio/visual presenation of certain information as opposed to the purely audio presentation of information. To this end250 volunteers were given a 10 minute presentation in which the information was presented in an audio/visual format. A second group of 250 volunteers was presented the same information in a purely audio format. Each person in each of the two groups was asked the same 20 questions related to the infomrstion in the presentation. The audio/visual grouo had an average of 10.2 correct responses with a sample standard deviation of 4. The purely audio group had an average of 9.4 correct responses with a standard deviation of 3. The marketing firm believes this means that the audio /visual format leads to better retention of the information. We test the hypothesed H1: µ1 - µ2 = 0 versus Ha: µ1-µ>0 at a 2% level of significance. Here µ1 denotes the population average number of correct responses for individuals…Thanks
- I already have a,b,c and d. I just need help on E, F, G, and HI need help with parts b-dThe defending attorney Mr. Justin Case was interested in how a lengthy trial could affect howlong a jury would deliberate on a case (and see if he should just cut to the chase). He observed asample of courtroom trials and noticed the following:Days inTrial (X) 5 2 6 4 5 6 2 4 2 1 HoursDeliberation (Y) 4 4 1 3 1 3 9 2 3 7 5) Mr. Case’s client’s most recent case took 10 days to complete. How long should he \ predict the jury deliberation will take?