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- A sample of n-4 scores has a mean of M-8. If one new score with a value of X - 3 is added to the sample. what will be the value for the new mean? OM-8 O Cannot be determined with the information provided OM-7 OM-875Assume that a randomly selected subject is given a bone density test. Bone density test scores are normally distributed with a mean of 0 and a standard deviation of 1. Draw a graph and find P, the 11th percentile. This is the bone density score separating the bottom 11% from the top 89%. Which graph represents P ? Choose the correct graph below. O A. O B. OD. P11 P11 P11 P11 The bone density score corresponding to P1 is (Round to two decimal places as needed.) Click to select your answer(s). APR tv MacBook Air F9 F10 LLA 20 F3 F6 F8 F4 F5 F1 F2 & #3 7 8. %247 Confidence interval for a population proportion Twenty years ago, a very famous psychologist specializing in marriage counseling authored book detailing the way in which she believed spouses should communicate. She is now interested in the proportion of all couples who bought her book who stayed together. For a random sample of 200 couples who bought her book, she found that 162 of them stayed together. Based on this, compute a 95% confidence interval for the proportion of all couples who bought her book who stayed together. Then find the lower limit and upper limit of the 95% confidence interval. Carry your intermediate computations to at least three decimal places. Round your answers to two decimal places. (If necessary, consult a list of formulas.) Lower limit: Upper limit: Explanation W Check 19 # 3 E $ 4 R S 5 T 6 A Y & 7 11 8 Español 9 CO ? As Ⓒ2022 McGraw Hill LLC. All Rights Reserved. Terms of Use | Privacy Center | Accessibility M
- W 1. X A tablet computer manufacturer claims that its batteries last an average of 10.5 hours when playing videos. The quality control department randomly selects 20 tablets from each day's production and tests the batteries by playing a video repeatedly until the battery dies. The quality control department will reject the batteries from that day's production run if the mean battery life is less than 10.5 hours. Here are the data from one day: 10.3 10.0 10.3 10.6 10.5 10.3 10.1 10.6 11.5 10.3 10.3 12.7 10.6 11.3 13.9 12.5 12.4 10.8 10.2 12.2 The quality control department will test the hypotheses where p true mean battery life (in hours) while playing videos for tablets made during that day. Check that the conditions for performing the test are met. Assume the population is normally distributed. 3 e d C Ho:μ = 50 Ha:μl < 50 $ 4 f 25 % V t 6 (6 b Y h ∞ 7 u n * 00 8 ¡ m ( 9 k O Sign out 1 р Mar 29 7A researcher who studies mental health is interested in the length of time (in days) that a patient stays in the hospital after they have presented to emergency having suicidal ideation. The researcher follows the first 30 patients during the month of January and follows them until each one of them is released. Below is the histogram of the data obtained from the 30 patients. 1. What is the shape of this distribution and please construct a frequency table. Given the shape and type of data, which measure of central tendency would you be more likely to report? Why?An investigator predicts that students taking an achievement test in the morning will perform differently than students taking the same test in the afternoon. Eight students are assigned to take the test in the morning and 8 students are assigned to take the test in the afternoon. Run an independent samples t-test and summarize findings using an alpha level of .05, two-tailed. Also construct a bar graph to graphically represent your results. Morning Group: 25, 31, 44, 36, 29, 42, 39, 41 Afternoon Group: 22, 25, 24, 27, 33, 28, 31, 34
- A researcher has 8 teenagers report the number of times they have left the house without their parents knowing. Scores ranged from 0 to 5. The scores were 3, 1, 2, 5, 3, 1, 3, 4. What is the percentile rank for X = 3: ____%? (RANK SCORES IN YOUR FREQUENCY TABLE FROM HIGHEST TO LOWEST) SHOW YOUR WORK (i.e., write out the columns of the table)!!! a. 62.5 b. 37.5 c. answer not listed d. 75A random sample of people were selected in order to compare the hight between vegetarians and non-vegetarians. The relative-frequency histograms below show the height distribution of the fifteen vegetarian persons in the group and and the remaining people who are not vegetarian. What can be correctly concluded from these graphs? Vegetarian Not a Vegetarian 0.4 0.4 0.3 0.3 02 0.2 0.1 0.1 0.0 0.0 140 150 160 170 180 190 200 140 150 160 170 180 190 200 Height (cm) Height (cm) Select one or more: O a. being vegetarian causes people to be shorter on average O b. more than 30% of vegetarians in this study are between 160cm and 165cm tall Oc. the range of vegetarians heights is larger than the range of non-vegetarians heights O d. more than 45% of non-vegetarians in this study are more than 170cm tall Relative Frequency of Height (cm) Relative Frequency of Height (cm). Justin wants to know whether a commonly prescribed drug does improve the attention span of students with attention deficit disorder (ADD). He knows that the mean attention span for students with ADD who are not taking the drug is 2.3 minutes long. His sample of 12 students taking the drug yielded a mean of 4.6 minutes. Justin can find no information regarding σx , so he calculated s2x =1.96. a. Identify the independent and dependent variables. b. In a sentence, state the null hypothesis being tested. c. Using symbols, state the null and alternative hypotheses. d. Determine the critical region using a one-tailed test with alpha = .05. e .Conduct the hypothesis test (Do the math and compare the t-critical and t-obtained values). f. State your conclusions in terms of H0 (Should you reject the H0 or fail to reject/accept the H0). g. Based on your analysis, is there a relationship between the drug and attention span?
- A sample of n = 10 scores has a mean of 20. A person with a score of 1 is replaced with a person who has a score of 31. Find the new mean. a.31 b.17 c.21 d.23The following 10 values represented in the frequency table are the race finish times in hours for a randomly selected group of participants in an extreme 10-kilometre race (a 10k race with obstacles). Which of the following is closest to the mean of the data set? Hours f 0.9 1 1 1.1 1.2 1 1.3 1.4 1.5 N = 10 O 1.5 hours O 1.37 hours O 1 hours O 1.2 hours 21