-/ 1 Question 11 of 16 View Policies Current Attempt in Progress Transgender Adults A study' of transgender adults examines the age at which they began to transition and the age of their earliest memories of gender dysphoria. (In this exercise, we examine the age beginning transition and in Exercise 6.107 we examine the age of their earliest memories.) In the study of 210 transgender adults, the mean age at which they began transitioning was 32.6 with a standard deviation of 18.2. Find a 95% confidence interval for the mean age at which transgender adults begin transitioning. Zaliznyak M, Bresee C, and Garcia MM, "Age at First Experienceof Gender Dysphoria Among Transgender Adults Seeking Gender- Affirming Surgery," JAMA Network Open, March 16,2020. Some of the data has been approximated from informationin the paper. to Confidence interval (round to three decimal places): i e Textbook and Media Attempts: 0 of 6 used Submit Answer Save for Later

-/ 1 Question 11 of 16 View Policies Current Attempt in Progress Transgender Adults A study' of transgender adults examines the age at which they began to transition and the age of their earliest memories of gender dysphoria. (In this exercise, we examine the age beginning transition and in Exercise 6.107 we examine the age of their earliest memories.) In the study of 210 transgender adults, the mean age at which they began transitioning was 32.6 with a standard deviation of 18.2. Find a 95% confidence interval for the mean age at which transgender adults begin transitioning. Zaliznyak M, Bresee C, and Garcia MM, "Age at First Experienceof Gender Dysphoria Among Transgender Adults Seeking Gender- Affirming Surgery," JAMA Network Open, March 16,2020. Some of the data has been approximated from informationin the paper. to Confidence interval (round to three decimal places): i e Textbook and Media Attempts: 0 of 6 used Submit Answer Save for Later

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MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Q3. In a study, 21 seniors (> 65 years old) were assigned to either a Yoga group (to take Yoga classes for six months) or to Walking group (to exercise by walking regularly over six months). At the end of the six months, the physical fitness of the individuals was measured on a scale 0-100. The data are summarized below Group Мean Standard deviations Sample size Yoga 71.5 0.02 10 Exercise 70.5 0.03 11 a. Using alpha=0.02 and a p-value approach, test the hypothesis that yoga is better than exercise. b. Test the hypothesis that Yoga group has average score that exceeds 70 c. Test the hypothesis that the scores of the two groups have the same variance
3/16 Question 2 of 4, Step 2 of 4 Correct Incorrect A technician compares repair costs for two types of microwave ovens (type I and type II). He believes that the repair cost for type I ovens is greater than the repair cost for type Il ovens. A sample of 43 type I ovens has a mean repair cost of $70.15. with a standard deviation of $20.62. A sample of 57 type Il ovens has a mean repair cost of $65.36, with a standard deviation of $22.21. Conduct a hypothesis test of the technician's claim at the 0.05 level of significance. Let u, be the true mean repair cost for type I ovens and uz be the true mean repair cost for type Il ovens. Step 2 of 4: Compute the value of the test statistic. Round your answer to two decimal places. 囲 Tables E Keypad Answer How to enter your answer Keyboard Shortcuts Previous Step Answers Tutor Skip Try Similar Submit Answer © 2020 Hawkes Learning 618 PM P Search for anything 4 11/24/2020 hp 7 home G pause B ctri
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6. Two car hire firms A and B have the following records of number of cars together with records of breakdown per car for the year 2015. Firm Number of cars Mean no. of Standard deviation breakdown A 35 3.46 0.842 37 3.64 0.955 The A firm claims that from the figures, its cars are more reliable. Test this claim at 5% level of significance. |
5. Inferential Statistics - Hypothesis Testing Historically, evening long-distance calls from a particular city have averaged 15.4 minutes per call. In a random sample of 56 calls, the sample mean time was 17.3 minutes. Assume the population standard deviation is 5 minutes. Using a 0.05 level of significance, is there sufficient evidence to conclude that the average evening long-distance call has increased?
14. SAT Verbal Scores Do students who learned English and another language simultaneously score worse on the SAT Critical Reading exam than the general population of test takers? The mean score among all test takers on the SAT Critical Reading exam is 501. A random sample of 100 test takers who learned English and another language simultaneously had a mean SAT Critical Reading score of 485 with a standard deviation of 116. Do these results suggest that students who learn English as well as another language simultaneously score worse on the SAT Critical Reading exam? (a) State the appropriate null and alternative hypotheses. (b) Verify that the requirements to perform the test using the t-distribution are satisfied. (c) Use the classical or P-value approach at the a = 0.1 level of significance to test the hypotheses in part (a).
Friendship Motivation Scale for Children (FMSC), a scale de- signed to assess children’s desire for friendships. Two interesting conclusions are that friends generally report similar levels of the FMSC and girls tend to score higher on the FMSC than boys. Boys in the seventh grade scored a mean of 9.32 with a standard deviation of 1.71, and girls in the seventh grade scored a mean of 10.04 with a standard deviation of 1.83. Assuming that FMSC scores are normally distributed, determine the percentage of seventh-grade boys who have FMSC scores within a). one standard deviation to either side of the mean. b). two standard deviations to either side of the mean. c). three standard deviations to either side of the mean. d). Repeat parts (a)–(c) for seventh-grade girls.
3. A business consultant wanted to investigate if providing day care facilities on premises by companies reduces the absentee rate of working mothers from companies that provide day care facilities on premises. Sample of 50 mothers selected from the companies that provide day care facilities was taken. These mothers missed an average of 6.4 days from work last year with a standard deviation of 1.20 days. Another sample of 50 such mothers taken from companies that do not provide day care facilities on premises showed that these mothers missed an average of 9.3 days last year with a standard deviation of 1.83 days. Construct a 98 % confidence interval for the difference between the two population means.
5. A credit score is used by credit agencies (such as mortgage companies and banks) to assess the creditworthiness of individuals. Values range from 300 to 850, with a credit score over 700 considered to be a quality credit risk. According to a survey, the mean credit score is 702.9. A credit analyst wondered whether high-income individuals (incomes in excess of $100,000 per year) had higher credit scores. He obtained a random sample of 32 high-income individuals and found the sample mean credit score to be 719.1 with a standard deviation of 80.6. Conduct the appropriate test to determine if high-income individuals have higher credit scores at the a = 0.05 level of significance. State the null and alternative hypotheses. Ho: H (1) H: μ (2) (Type integers or decimals. Do not round.) Identify the t-statistic. to = (Round to two decimal places as needed.) Identify the P-value. P-value = (Round to three decimal places as needed.) Make a conclusion regarding the hypothesis. (3) the null…
1.23. |Mean and standard deviation. Enter the following data into the Data tab in the One-Variable Statistical Calculator applet: 8, 9, 10, 11, 12. Examine the Statistics tab and report the mean and the standard deviation. |Mean for different data. Refer to the previous exercise. Consider the data 8, 8, 9, 9, 10, 10, 11, 11, 12, 12. 1.24. (a) How would you expect the mean for these data to differ from what you found in the previous exercise? (b) Check your answer to part (a) using the One-Variable Statistical Calculator applet. (c) Repeat parts (a) and (b) of this exercise for the following data: 8, 8, 9, 9, 10, 10, 11, 11, 12, 13. Write a short explanation for what you have found. |Standard deviation for another set of data. Refer to Exercise 1.23. Consider the data 6, 8, 10, 12, 14. 1.25. (a) How would you expect the standard deviation for these data to differ from what you found in Exercise 1.23? (b) Check your answer to part (a) using the One-Variable Statistical Calculator applet.
12) A state fish hatchery raises trout for stocking streams and lakes. The size of the fish at release time can be controlled to a fair degree by varying the rate of feeding. The target is a mean of 10 ounces; if the fish are too small, those who catch the fish aren’t happy. A random sample of 75 fish were weighed at time of release and it was determined that the mean was 9.66 ounces with a standard deviation of 0.86 ounces. Test to determine if the fish being released have a population mean less than 10 ounces at the 0.01 significance level.
estioh 20 For a 4-unit class like Statistics, students should spend average of 12 hours studying for the class. A survey was done on 27 students, and the distribution of total study hours per week is bell-shaped with a mean of 14 hours and a standard deviation of 2.6 hours. Use the Empirical Rule to answer the following questions. a) 68% of the students spend between hours and hours on Statistics each week. b) 95% of the students spend between hours and hours on Statistics each week. c) 99.7% of the students spend between hours and hours on Statistics each week. Question Help: Written Example > Next Question DD 888 F9 80 FB F7 F6 F5 F4 F3 F2 F1 & 23 2$ 8. 9. 7 1 2 3 T Q W K H S F 8: < CO