Chapter 10, Problem 10.86CRP

The SAT and ACT exams are often used to predict a student's first-term college grade point average (GPA). Different formulas are used for different colleges and majors. Suppose that a student is applying to a university with an intended major in civil engineering. Also suppose that for this college and this major, the following model is used to predict first term GPA. GPA  =  a + b(ACT) a  =  0.6 b  =  0.2 (a) In this context, what would be the appropriate interpretation of the value of a?   The value of a is the predicted ACT score of a student who has a 0 GPA.   There is not enough information to know how to interpret the value of a.   The value of a represents the change in predicted GPA associated with an increase of 1 in ACT score.   The value of a represents the change in predicted GPA associated with an decrease of 1 in ACT score.   The value of a is the predicted GPA of a student who scored a 0 on the ACT.   (b) In this context, what would be the…

A seamstress works exclusively on one stage of the process of a special garment design. This phase requires exactly half an hour to finish the garment. Every 30 minutes an assistant arrives at the seamstress's table to collect those finished garments and deliver those that require the process (unprocessed garments).The number of raw garments brought by the assistant to the seamstress is uncertain; 30% of the occasions arrive without garments; 50% of the time he wears one garment and 20% of the time he wears 2 garments. The assistant is instructed that there are never more than three unprocessed garments left on the seamstress's table (those that cannot be left are taken to another seamstress). Determine the transition graph and matrix that models the number of raw garments on the seamstress's table just before the assistant arrives.

A quality inspection engineer has conducted tests on the electronic components produced by one of the production lines. The reliability of the component tested, and the results are given in the Table 1. Construct and analyze the life-history for the test data. Table 1 Test Hours 0- 39 40 -79 Failures 150 Survivors 350 75 275 80 -119 30 245 120 -159 27 218 160 -199 23 194 200 - 239 32 163 240 - 279 53 110 280 - 319 62 48 320 - 359 360 - 399 32 16 16

The Carbondale Hospital is considering the purchase of a new ambulance. The decision will rest partly on the anticipated mileage to be driven next year. The miles driven during the past 5 years are as​ follows:  Year 1 2 3 4 5Mileage 3,050 3,950 3,450 3,850 3,800 a) Using a​ 2-year moving​ average, the forecast for year 6​ =  miles ​(round your response to the nearest whole​ number).

At a large furniture and electrical​ store, customers usually find that the furniture on display is not held in stock. Rather than being immediately​ available, it must be sourced from manufacturers. In the sofa​ department, the average delivery time is expected to be six weeks after purchase. In order to test whether this target is​ accurate, the store records the delivery times​ (in days) taken for 50 sofa purchases. Complete parts​ (a) through​ (d).   LOADING... Click the icon to view the data table.       a. The supervisor claims that the mean number of days between receipt of the order and delivery of the sofa is 42 days or more. At the 0.05 level of​ significance, is there evidence that the claim is not true​ (that is, that the mean number of days is less than 42​)?   State the null and alternative hypotheses. Choose the correct answer below.     A. H0​: μ>42 H1​: μ<42   B. H0​: μ≠42 H1​: μ=42   C. H0​: μ≤42 H1​: μ>42   D. H0​:…

At a large furniture and electrical​ store, customers usually find that the furniture on display is not held in stock. Rather than being immediately​ available, it must be sourced from manufacturers. In the sofa​ department, the average delivery time is expected to be six weeks after purchase. In order to test whether this target is​ accurate, the store records the delivery times​ (in days) taken for 50 sofa purchases. Complete parts​ (a) through​ (d).   LOADING... Click the icon to view the data table.         a. The supervisor claims that the mean number of days between receipt of the order and delivery of the sofa is 42 days or more. At the 0.05 level of​ significance, is there evidence that the claim is not true​ (that is, that the mean number of days is less than 42​)?   State the null and alternative hypotheses. Choose the correct answer below.     A. H0​: μ>42 H1​: μ<42   B. H0​: μ≠42 H1​: μ=42   C. H0​: μ≤42 H1​: μ>42   D.…

Exercises 5: A corporation owns a chain of several hundred gasoline stations on the eastern seaboard. The marketing director wants to test a proposed marketing campaign by running ads on some local television stations and determil Ining whether gasoline sales at a sample of the company's stations increase after the advertising. The fllowing data represent gasoline sales for a day before and a day after the advertising campaign. Determine whether sales increased significantly after the advertising campaign. Use an alpha of 0.05. Station Before After $10,500 $12,600 2 8870 10660 3 12300 11890 4 10510 14630 5570 8580 9150 10115 7 11980 14350 8 6740 6900 7340 8890 10 13400 16540 11 12200 11300 12 10570 13330 13 9880 9990 14 12100 14050 15 9000 9500 16 11800 12450 17 10500 13450

You've found an odd mole growing on the inside of your elbow. You'd rather not think about it, but a close friend encourages you to have a doctor look at it. You feel better when you look online and see that only about 196 of atypical moles are cancerous. But just in case, you make an appointment with a doctor. The doctor thinks the mole is suspicious and orders blood to be drawn for two tests, and it takes a few days for the lab results to come back. While waiting for the lab results you look up the reliability of the tests the doctor ordered. • Test A has a sensitivity of 38.8% and a specificity of 99.9% • Test B has a sensitivity of 86.2% and a specificity of 93.7% Complete the table below for Test A showing how many patients, out of 1000, you would expect to have a true positive, a false positive, a true negative, and a false negative. Round all answers in the table to two decimals. Test A Positive Test Negative Test Total Mole is Cancerous Mole is Benign Total 1000 QUESTION 2…

The manufacturer of a certain engine treatment claims that if you add their product to your engine, it will be protected from excessive wear. An infomercial claims that a woman drove 6 hours without oil, thanks to the engine treatment. A magazine tested engines in which they added the treatment to the motor oil, ran the engines, drained the oil, and then determined the time until the engines seized. Complete parts (a) and (b) below. ..... (a) Determine the null and alternative hypotheses that the magazine will test. Но: 6.