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myopenmath.oom Chapter 8.3 Homework Score: 0/13 0/13 answered Progress saved Done {El}! WC. 0 Question 5 v E 0/1 pt '0 3 8 99 (D Details You wish to test the following claim (Ha) at a significance level of oz : 0.02. Hazy : 62.2 Haul ~o 0 H12 Select an answer hours Based on the hypotheses, find the following: Test Statistic= p-value= The correct decision is to Select an answer 0 The correct summary would be: Select an answer 0 that the mean number of hours of all employees at start-up companies work more than the US thuu-m 11:45 Done myopenmath.com AA C Chapter 8.3 Homework Score: 0/13 0/13 answered Progress saved Done & Vo . . . Question 10 l3 0/1 pt '0 3 8 99 6) Details If your claim is in the alternative hypothesis and you reject the null hypothesis, then your conclusion would be: 0 The sample data support the original claim 0 There is not sufficient sample evidence to support the original claim 0 There is not sufficient evidence to warrant rejection of the original claim 0 There is sufficient evidence to warrant rejection of the original claim Question Help: 8 Message instructor Submit Question E myopenmath.com Lnapter 5.5 HomeworK Score: 0/13 0/13 answered Progress saved Done (a) 116C. 0 Question 2 v E 0/1 pt 0 3 8 99 (9 Details Test the claim that the mean GPA of night students is larger than 2.8 at the .10 significance level. The null and alternative hypothesis would be: H0:p : 0.7 H0:/,L : 2.8 How, : 2.8 H0:p : 0.7 H121) 2.8 H1211, 0.7 O O O O H0:,u= 2.8 Hozpz 0.7 H1:,u7 2.8 lep7 0.7 O O The testis: two-tailed right-tailed left-tailed O O O Based on a sample of 65 people, the sample mean GPA was 2.81 with a standard deviation of 0.03 The test statistic is: (to 2 decimals) The critical value is: (to 2 decimals) Based on this we: O Fail to reject the null hypothesis 0 Reject the null hypothesis Question Help: 8 Message instructor Lab Assignment Name: Section 8.3 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. Testing Hypotheses. In Exercises 9-24, assume that a simple random sample has been selected and test the given claim. Unless specified by your instructor, use either the P-value method or the critical value method for testing hypotheses. Identify the null and alternative hypotheses, test statistic, P-value (or range of P-values), critical value(s), and state the final conclusion that addresses the original claim. 12. Discarded Plastic The weights (Ib) of discarded plastic from a sample of households is listed in Data Set 23 in Appendix B, and the summary statistics are " = 62, x = 1.911 lb, and s = 1.065 lb. Use a 0.05 significance level to test the claim that the mean weight of discarded plastic from the population of households is greater than 1.800 lb. 32. Repeat Exercise 12 assuming that the population standard deviation of is known to be 1.065 lb. 14. Human Body Temperature Data Set 3 in Appendix B includes a sample of 106 body temperatures with a mean of 98.20"F and a standard deviation of 0.62 F. Use a 0.05 sig- nificance level to test the claim that the mean body temperature of the population is equal to 98.6 F, as is commonly believed. Is there sufficient evidence to conclude that the common belief is wrong? PAGE 12216. Flight Delays Data Set 15 in Appendix B lists 48 different departure delay times (minutes) for American Airlines flights from New York (JFK) to Los Angeles. Negative departure delay times correspond to flights that departed carly. The mean of the 48 times is 10.5 min and the standard deviation is 30.8 min. Use a 0.01 significance level to test the claim that the mean departure delay time for all such flights is less than 12.0 min. Is a flight operations manager justified in reporting that the mean departure time is less than 12.0 min? 20. Ages of Race Car Drivers Listed below are the ages (years) of randomly selected race car drivers (based on data reported in USA Today). Use a 0.05 significance level to test the claim that the mean age of all race car drivers is greater than 30 years. 32 32 33 33 41 29 38 32 33 23 27 45 52 29 25 24. Highway Speeds Listed below are speeds (mi/h) measured from southbound traffic on I-280 near Cupertino, California (based on data from SigAlert). This simple random sample was obtained at 3:30 P.M. on a weekday. Use a 0.05 significance level to test the claim that the sample is from a population with a mean that is less than the speed limit of 65 mi/h. 62 61 61 57 61 54 59 58 59 69 60 67 PAGE 123i myopenmath.com Score: 0/13 0/13 answered Progress saved Done (31 EC. 0 Question 7 v l3 0/1 pt '0 3 8 99 G) Details Statistics students believe that the mean score on a first statistics test is 65. The instructor thinks that the mean score is higher. She samples 10 statistics students and obtains the scores: -m---\" 6 Test grades are believed to be normally distributed. Use a significance level of 5%. A. State the alternative hypothesis: H A: Op% Op#% B. State the mean of the sample: C. State the standard error of the sample means: D. State the test statistic: t : E. State the p-value: F. Decision: 0 Reject the null hypothesis. 0 Fail to reject the null hypothesis. Done 6 myopenmath.com AA (3 Chapter 8.3 Homework Score: 0/13 0/13 answered Progress saved Done (3) wlc. 0 Question 1 v IZO/1 pt '0 3 8 99 G) Details Testing: H0 : p, : 48.01 H1:p, 75 48.01 Your sample consists of 23 subjects, with a mean of 49.6 and standard deviation of 3.78. Calculate the test statistic, rounded to 2 decimal places. it: Question Help: 8 Message instructor Submit Question Done 3 myopenmath.com AA (3 Chapter 8.3 Homework Score: 0/13 0/13 answered Progress saved Done (a) WC. 0 Question 11 v 80/1 pt '0 3 8 99 G) Details 60% of students entering four-year colleges receive a degree within six years. Is this percent higher for students who play intramural sports? H0: ? 0 Select an answer 0 S Ha: ? G Select an answer 3 S Question Help: Q Read El Video 8 Message instructor Submit Question ""D""'""'""""" _____ 'II' "~_' . . Question 3 v Ill/on pt '0 3 8 99 6) Details You wish to test the following claim (Ha) at a significance level of oz : 0.005. Hana = 71.2 Hazy 80/1 pt '0 3 8 99 G) Details You wish to test the following claim (Ha) at a significance level of a = 0.001. H0:p 256.6 Hazy