For Exercises 5–8: (a) State the null hypothesis and the alternate hypothesis. (b) State the decision rule. (c) Compute the value of the test statistic. (d) What is your decision regarding H0? (e) What is the p-value? Interpret it.
5. The manufacturer of the X-15 steel-belted radial truck tire claims that the mean mileage the tire can be driven before the tread wears out is 60,000 miles. Assume the mileage wear follows the
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Gen Combo Ll Statistical Techniques In Business And Economics; Connect Ac
- Do people walk faster in the airport when they are departing (getting on a plane) or do they walk faster when they are arriving (getting off a plane)? A reputable researcher measured the walking speed of random travelers in two International Airports. His findings are summarized in the table. Complete parts (a)-(c) below. Click the icon to view the findings. Walking Speed - X Direction of Travel Departure Mean speed 254 Arrival 267 = 0.05 level of significance? Let μ₁ represent the mean speed of people departing and H2 represent the mean speed of (feet per minute) Standard 47 38 deviation (feet Print Done Determine the P-value for this hypothesis test. P-value = (Round to three decimal places as needed.) B. Ho: H1 H2 H₁: H₁>H₂ D. Ho: H1 H2 H₁: H1 H2.arrow_forwardA study done in 1997 showed that 4.7% of mothers smoked cigarettes during their pregnancy. An obstetrician feels that this percentage is higher now. To test this, the obstetrician takes a sample of 150 mothers and finds that 9 of them smoked during their pregnancy. Test the obstetrician's claim at the a=0.05 level of significance. Write your answer in the following form P-Value, Conclusion Example: 0.15, There is not sufficient evidence that the mean weight of pandas is less than 200 pounds. Edit View Insert Format Tools Table 12pt Paragraph v BIU Av2v T2く v E v Pv ...arrow_forwardDescribe type I and type II errors for a hypothesis test of the indicated claim. A clothing store claims that at least 80% of its new customers will return to buy their next article of clothing. Describe the type I error. Choose the correct answer below. OA. A type I error will occur when the actual proportion of new customers who return buy their next article of clothing is at least 0.80, but you reject Ho: p20.80. OB. A type I error will occur when the actual proportion of new customers who return to buy their next article of clothing is at least 0.80, but you fail to reject Ho: p20.80. OC. A type I error will occur when the actual proportion of new customers who return article of clothing is no more than 0.80, but you fail to reject Ho: p≤0.80. OD. A type I error will occur when the actual proportion of new customers who return article of clothing is no more than 0.80, but you reject Ho: p≤0.80. buy their next buy their nextarrow_forward
- Investigators are trying to determine if the contamination of a town well led to significant increases in adverse health effects. During the period of time when water was consumed from this contaminated well, there were 16 birth defects among 414 births. After this well was shut off, there were 3 birth defects among 228 births. You asked to determine if the rate of birth defects was higher when the contaminated well was in use. a. Test the claim that the contaminated well was not associated with a change in the rate of birth defects in the community at the alpha = 0.05 level, by using the two-proportion z test. Confirm your answers using Stata. b. Calculate a 95% confidence interval for the true difference between the proportions of birth defects when the contaminated well was in use versus when the well was shut down. c. Construct the 2x2 contingency table representing the data to Calculate the odds of a birth defect when the contaminated water was consumed and when the well was shut…arrow_forwardPC Gaming: A computer magazine editor claims that the mean cost of a gaming computer is $1250. A test is made of =:H0μ1250 versus ≠:H1μ1250. The null hypothesis is not rejected. State an appropriate conclusion.arrow_forwardYou are a consumer psychologist interested in holiday spending. A national census reports that the American family spent an average of µ = $81 for Halloween candy and costumes last year. A sample of N = 16 families this year produced a mean of $85 with s = 20. t-value ? t-critical?arrow_forward
- In a hypothesis test, H0 is p < 0.45 and Ha is p > 0.45. If the test statistic is z = 1.68, what is the P-value? Draw picture and give P-value only. Do not do rest of testing.arrow_forwardIs the average time to complete an obstacle course shorter when a patch is placed over the right eye than when a patch is placed over the left eye? Thirteen randomly selected volunteers first completed an obstacle course with a patch over one eye and then completed an equally difficult obstacle course with a patch over the other eye. The completion times are shown below. "Left" means the patch was placed over the left eye and "Right" means the patch was placed over the right eye. Time to Complete the Course Right 43 50 42 48 50 50 47 48 Left 44 50 42 53 48 53 47 48 Assume a Normal distribution. What can be concluded at the the a = 0.10 level of significance level of significance?arrow_forwardHelp me fast with detail explanation. Definitely I will give Upvote.arrow_forward
- Find the p-value in a test of the claim that the mean College Algebra final exam score of engineering majors equal to 88, given that the test statistic is z= 1.50. O A. 0.1336 O B. 0.9331 OC. 0.1500 D. 0.0668 Click to select your answer. F10 000 ODO F7 F8 F9 esc F4 F5 F6 F1 F2 F3 % & %24arrow_forwardAlpha again Environmentalists concerned about theimpact of high-frequency radio transmissions on birdsfound that there was no evidence of a higher mortalityrate among hatchlings in nests near cell towers. Theybased this conclusion on a test using a = 0.05. Wouldthey have made the same decision at a = 0.10? Howabout a = 0.01? Explain.arrow_forwardDescribe type I and type II errors for a hypothesis test of the indicated claim. A lumber store claims that at least 25 % of its new customers will return to buy their next order of lumber . Describe the type I error. Choose the correct answer below. A. A type I error will occur when the actual proportion of new customers who return to buy their next order of lumber is at least 0.25 , but you reject Upper H 0 : pgreater than or equals 0.25 . B. A type I error will occur when the actual proportion of new customers who return to buy their next order of lumber is no more than 0.25 , but you reject Upper H 0 : pless than or equals 0.25 . C. A type I error will occur when the actual proportion of new customers who return to buy their next order of lumber is at least 0.25 , but you fail to reject Upper H 0 : pgreater than or equals 0.25 . D. A type I error will occur when the actual proportion of…arrow_forward
- Glencoe Algebra 1, Student Edition, 9780079039897...AlgebraISBN:9780079039897Author:CarterPublisher:McGraw HillHolt Mcdougal Larson Pre-algebra: Student Edition...AlgebraISBN:9780547587776Author:HOLT MCDOUGALPublisher:HOLT MCDOUGAL