Mathematics problem solving
178175 questions • Page 143 / 3564
1. A medical study reports that it took a random sample and found a 99% confiden
1. A medical study reports that it took a random sample and found a 99% confidence interval for a population mean to be (4, 8). (That is, 4 < population mean < 8.) We may co…
1. A metropolitan bus system sampler\'s rider counts on one of its express commu
1. A metropolitan bus system sampler's rider counts on one of its express commuter routes for a week. Use the following data to establish whether ridership is evenly balanced by d…
1. A metropolitan utility company in a western city of the United States expects
1. A metropolitan utility company in a western city of the United States expects the consumption of electricity to increase by 4%/year during the next decade, due mainly to the ex…
1. A model is classified as a (M/G/4):(FCFS/8/30) queueing system. Fill in the b
1. A model is classified as a (M/G/4):(FCFS/8/30) queueing system. Fill in the blanks below The “M” tells us __________________ The “G” tells us __________________ The “4” tells u…
1. A motorcycle dealer has 9 adventure bikes for sale. She wants to mark down tw
1. A motorcycle dealer has 9 adventure bikes for sale. She wants to mark down two of these for a special sale. How many different pairs of these nine adventure bikes are possible,…
1. A multiple regression analysis is to be carried out for the model y = AX1+AX2
1. A multiple regression analysis is to be carried out for the model y = AX1+AX2+3Xs+E. The model does not include an intercept term, so np column of 1's in X. There are six obser…
1. A multiple regression model, Y = a + bX + cX 2 , is estimated by creating a n
1. A multiple regression model, Y = a + bX + cX 2, is estimated by creating a new variable named “X2” that equals X 2 (X square). A computer package produces the followi…
1. A multiple-choice test consists of 15 questions, each permitting a choice of
1. A multiple-choice test consists of 15 questions, each permitting a choice of three alternatives. In how many different ways can a student check off her answers to these questio…
1. A multiple-choice test consists of 15 questions, each permitting a choice of
1. A multiple-choice test consists of 15 questions, each permitting a choice of three alternatives. In how many different ways can a student check off her answers to these questio…
1. A multiple-choice test has 30 questions each with five responses, one of whic
1. A multiple-choice test has 30 questions each with five responses, one of which is correct. The lowest passing grade is, Find the probability of obtaining this grade by random g…
1. A multiple-choice test has 30 questions each with five responses, one of whic
1. A multiple-choice test has 30 questions each with five responses, one of which is correct. The lowest passing grade is, Find the probability of obtaining this grade by random g…
1. A music instructor wants assess the relationship between hours spent in pract
1. A music instructor wants assess the relationship between hours spent in practice and the score in a national technical exam. She selects a random sample of 300 students and cor…
1. A national car rental agency is interested in determining whether the mean da
1. A national car rental agency is interested in determining whether the mean days that customers rent cars is the same between three of its major cities. The following data refle…
1. A new highway will be constructed and there are two options, designed around
1. A new highway will be constructed and there are two options, designed around the choice of material for the road surface. Choice A is to use an asphalt surface and B uses concr…
1. A new psychopharmacological drug to treat depression will significantly reduc
1. A new psychopharmacological drug to treat depression will significantly reduce depressive symptoms among patients compared to patients who receive a placebo drug. Identify the …
1. A new psychopharmacological drug to treat depression will significantly reduc
1. A new psychopharmacological drug to treat depression will significantly reduce depressive symptoms among patients compared to patients who receive a placebo drug. Identify the …
1. A new species of animal is discovered. If a diploid cell from this animal has
1. A new species of animal is discovered. If a diploid cell from this animal has 82 chromosomes in each of its body cells, how many cells will each gamete have? a.) 82 b.) 41 c.) …
1. A new three-screen cinema has just opened in the town of Quirpoon. The table
1. A new three-screen cinema has just opened in the town of Quirpoon. The table summarizes the fraction of customers attending each of the three movies showing on a given night an…
1. A new weight-reducing technique, consisting of a liquid proteindiet, is curre
1. A new weight-reducing technique, consisting of a liquid proteindiet, is currently undergoing tests by the Food and DrugAdministration (FDA) before its introduct…
1. A new, lightweight plastic will be used in making cell phone screens. Its ten
1. A new, lightweight plastic will be used in making cell phone screens. Its tensile strength measurements are known to have normal distribution with mean 33.1 and variance .412. …
1. A newspaper article about a family in which a woman, her daughter and her gra
1. A newspaper article about a family in which a woman, her daughter and her grandson have the same birthday claimed the chance of this is "one in nearly 49 mllion, according teo …
1. A newspaper article about a family in which a woman, her daughter and her gra
1. A newspaper article about a family in which a woman, her daughter and her grandson have the same birthday claimed the chance of this is "one in nearly 49 million, according to …
1. A newspaper reported the following numbers of calls per hour received by 911
1. A newspaper reported the following numbers of calls per hour received by 911 over a specific 36 hour period 2 1349 16 22576422 410 313342 1332 3 25 21 024 The paper also report…
1. A non-significant result means: A) \"proof\" for the research hypothesis B) \
1. A non-significant result means: A) "proof" for the research hypothesis B) "proof" for the null hypothesis C) "no difference" D) "Inconclusive" 2. Before running statistical ana…
1. A normal distribution has a mean of 50 and a standard deviation of 4. Determi
1. A normal distribution has a mean of 50 and a standard deviation of 4. Determine the value below which 95% of the observations will occur. a. X=60.00 b. X=56.60 c. X=50.00 d. X=…
1. A normal distribution with mean $700 and standard deviation $150 will be used
1. A normal distribution with mean $700 and standard deviation $150 will be used to model the monthly rental rate for 1 BR apartments in a college town. a) Use the Empirical Rule …
1. A nuclear power plant has double redundancy on the feedwater pumps used to re
1. A nuclear power plant has double redundancy on the feedwater pumps used to remove heat from the reactor core. A safely operating plant requires only one of the three pumps to b…
1. A numerical description of the outcome of an experiment is called a a. descri
1. A numerical description of the outcome of an experiment is called a a. descriptive statistic b. probability function c. variance d. random variable 2. A ran…
1. A numerical description of the outcome of an experiment is called a a. descri
1. A numerical description of the outcome of an experiment is called a a. descriptive statistic b. probability function c. variance d. random variable 2. A ran…
1. A nutrition researcher wishes to compare two methods of obtaining dietary inf
1. A nutrition researcher wishes to compare two methods of obtaining dietary information for the purpose of estimating caloric intake. Method 1 is a 24-hr recall (respondents reco…
1. A nutritionist claims that the proportion of females who consume too much sat
1. A nutritionist claims that the proportion of females who consume too much saturated fat is lower than the proportion of males who consume too much saturated fat. In interviews …
1. A pain medication claims to provide at least 6.5 hours of relief. A sample of
1. A pain medication claims to provide at least 6.5 hours of relief. A sample of 12 headache sufferers took the medication and reported the following (ordered) durations of relief…
1. A paired t test should be used where: a. There is a quantitative variable of
1. A paired t test should be used where: a. There is a quantitative variable of interest, the samples are dependent, and the standard deviation is unknown. b. There is a qualitati…
1. A paper in the Journal of Nervous and Mental Disorders (vol. 146 pp. 136-146)
1. A paper in the Journal of Nervous and Mental Disorders (vol. 146 pp. 136-146) compared the amount of dextroamphetamine excreted by children classified as having either organic …
1. A parent raises a child\'s allowance by 15% each year. Ifthe allowance is $3
1. A parent raises a child's allowance by 15% each year. Ifthe allowance is $3 now, when will it reach $15? 2. A scientist notes the bacteria count in a petrie dish is50. Two hour…
1. A park contains three species of squirrels: gray, red, and fox squirrels. If
1. A park contains three species of squirrels: gray, red, and fox squirrels. If there are 120 gray squirrels, 50 red squirrels, and 30 fox squirrels. a. What is the probability th…
1. A partially completed schedule of the company’s total and per unit costs over
1. A partially completed schedule of the company’s total and per unit costs over the relevant range of 69,000 to 109,000 units produced and sold annually is given below: Complete …
1. A particle moves along a 1-dimensional line. Itsydisplacement from the origin
1. A particle moves along a 1-dimensional line. Itsydisplacement from the origin (positive to the right, negative to the left) is s t3 122+36t, t0, where s is measured in meters a…
1. A particle moves by . (2 points each.) a) Use Maple to graph the path of the
1. A particle moves by . (2 points each.) a) Use Maple to graph the path of the particle from t=0 to t=2p/7. b) Find the unit tangent vector when…
1. A particle moves with a fixed acceleration 3 . If its initial velocity is v(0
1. A particle moves with a fixed acceleration 3 . If its initial velocity is v(0) = 2 m/s, and its initial displacement is s(0) = 0. …
1. A particular brand of candy-coated chocolate comes in five different colors t
1. A particular brand of candy-coated chocolate comes in five different colors that we shall denote as Ai = {brown), A2 {yellow}, A3 {orange), A4 = {green), and As cof fee). Let p…
1. A password of length 5 is generated at random as a sequence of letters from A
1. A password of length 5 is generated at random as a sequence of letters from A,...,Z with repetitions allowed. What is the probability that in every pair of adjacent positions i…
1. A patient in hospital is on an IV drip. This delivers a saline solution with
1. A patient in hospital is on an IV drip. This delivers a saline solution with an added antibiotic. The mixture is delivered at a rate of 125ml per hour (that is 3 l per day). Th…
1. A patient in hospital is on an IV drip. This delivers a saline solution with
1. A patient in hospital is on an IV drip. This delivers a saline solution with an added antibiotic. The mixture is delivered at a rate of 125ml per hour (that is 3 l per day). Th…
1. A pediatric nurse is interested in understanding how the respiration rate for
1. A pediatric nurse is interested in understanding how the respiration rate for newborn babies is affected by their surroundings while in the hospital. It is known that the avera…
1. A person B is located 350 meters east from a person A. Person A starts riding
1. A person B is located 350 meters east from a person A. Person A starts riding a bike north at a rate of 5 m/ sec and 7 minutes later person B starts riding a bike south at a ra…
1. A person has purchased 5 of 1,000 tickets sold in acertain raffle. To determi
1. A person has purchased 5 of 1,000 tickets sold in acertain raffle. To determine the 10th prizewinners, 10 tickets aredrawn at random and without replacement. a) Compute the pro…
1. A person has purchased 5 of 1,000 tickets sold in acertain raffle. To determi
1. A person has purchased 5 of 1,000 tickets sold in acertain raffle. To determine the 10th prizewinners, 10 tickets aredrawn at random and without replacement. a) Compute the pro…
1. A pharmaceutical company conducted a study to evaluate theeffectiveness and s
1. A pharmaceutical company conducted a study to evaluate theeffectiveness and safety of a new inhaled form of insulin for thetreatment of diabetes. A group of 650 diabetics was g…
1. A pharmaceutical company wants to estimate the mean response time for a suppl
1. A pharmaceutical company wants to estimate the mean response time for a supplement to reduce blood glucose levels in diabetic patients. One hundred fifty patients with diabetes…
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