Researchers test the usefulness (in months) of three different systems on tested on four companies. Test at a = 0.05 of the mean usefulness of the a)three different systems; b) different companies System COMPANY 1 COMPANY 2 COMPANY 3 COMPANY 4 A 45 48 50 45 B 46 41 47 46 C 51 50 45 41

Researchers test the usefulness (in months) of three different systems on tested on four companies. Test at a = 0.05 of the mean usefulness of the a)three different systems; b) different companies System COMPANY 1 COMPANY 2 COMPANY 3 COMPANY 4 A 45 48 50 45 B 46 41 47 46 C 51 50 45 41

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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The dataset NBAPlayers2015 contains information on many variables for players in the NBA (National Basketball Association) during the 2014–2015 season. The dataset includes information for all players who averaged more than 24 minutes per game, and includes players and 24 variables.Distribution of Blocked Shots in the NBAThe variable Blocks in the dataset NBAPlayers2015 includes information on the number of blocked shots during the season for each of the 182 players in the dataset.The following are the 30 data values randomly selected from the dataset. 34 17 8 14 30 42 10 74 36 18 7 68 29 147 21 54 50 49 20 8 12 4 84 103 21 45 153 84 142 30 Click here to access StatKey. (a) Use StatKey or other technology to find the mean and the standard deviation of the number of blocked shots. (Note: Please use the above data values for your calculation) Round your answers to one decimal place.mean = Enter your answer in accordance to item (a) of the question statement…
A statistics professor would like to build a model relating student scores on the first test to the scores on the second test. The test scores from a random sample of 21 students who have previously taken the course are given in the table. Student Test Grade 1 Test Grade 21 42 812 51 743 88 624 99 575 54 726 66 737 87 638 99 579 97 5810 89 6311 42 7712 71 6313 96 5514 56 7615 75 6916 57 7017 62 7518 89 6319 50 7220 56 7221 89 57Step 1 of 2 : Using statistical software, estimate the parameters of the modelSecond Test Grade=β0+β1(First Test Grade)+εi.Enter a negative estimate as a negative number in the regression model. Round your answers to 4 decimal places, if necessary.
I need help with identifying the independent and dependent variables in excel. Explain the step-by-step procedures in excel.
Consider a study that surveyed 50 people to rate how much they like their job. Ratings mean 1 for “hate my job”, 2 for “dislike my job”, 3 for “neutral”, 4 for “like my job” and 5 for “love my job”. This survey found that • 8 people hated their job• 14 people disliked their job • 15 people were neutral• 9 people liked their job, and • 4 people loved their job. (1) Write a description of the random variable describing this survey(2) Write a probability distribution describing the probability of the outcomes of this event. (3) What probability of people like their job?(4) Calculate the expected rating.
Solid fats are more likely to raise blood cholesterol levels than liquid fats. Suppose a nutritionist analyzed the percentage of saturated fat for a sample of 6 brands of stick margarine (solid fat) and for a sample of 6 brands of liquid margarine and obtained the following results: Stick:[26.4,25.5,25.8,26.1,25.6,26.3] Liquid:[16.9,16.9,17.2,17.3,16.3,17.1] We want to determine if there a significant difference in the average amount of saturated fat in solid and liquid fats. What is the test statistic? a) t = 42.744 b) z = 42.244 c) t = 42.244 d) z = 42.744 e) t = 25.816
Ecologists conducted a study to investigate the potential ecological impact of golf courses. Investigators monitored the reproductive success of bluebirds in birdhouses at nine golf courses and ten similar birdhouses at nongolf sites. Data on nests in birdhouses occupied only by bluebirds are shown in the table. Observed Number of Nests per Birdhouse by Location 0 nests 1 nest 2 or 3 nests Total Golf 30 42 8 80 Nongolf 40 58 22 120 Total 70 100 30 200 40 A 42 B 50 C 58 D 60 E
The Federal Bureau of Investigation (FBI) compiles data on crimes and crime rates and publishes the information in Crime in the United States. A violent crime is classified by the FBI as murder, forcible rape, robbery, or aggravated assault. The first two columns of Data set 1 give a relative-frequency distribution for (reported) violent crimes in the year 2010. A random sample of 500 violent-crime reports from last year yielded the frequency distribution shown in the first and third columns of Data set 1. At the 5% significance level, do the data provide sufficient evidence to conclude that last year's violent-crime distribution is different from the 2010 distribution? Use this information to answer the question. Click here to view the StatCrunch report. The value of the p-value is . Since the p-value distribution. (Round to four decimal places as needed.) α, we and determine that there sufficient evidence to conclude that last year's violent-crime distribution is different from the…
A firm must decide between two different suppliers of lightbulbs. Management has decided to order from supplier A unless it can be proven that the mean lifetime of lightbulbs from supplier Bis superior. A test of 28 lightbulbs from A and 32 lightbulbs from B yielded the following data as to the number of hours of use given by each lightbulb: a 121 76 88 103 96 89 100 112 105 101 92 98 87 75 111 118 121 96 93 |82 105 78 84 96 103 119 85 84 b 127 133 87 91 81 122 115 | 107 109 89 82 90 81 104 | 109 110 106 85 93 90 100 122 117 109 98 94 103 107 101 99 112 90 Is there a significant difference between the two suppliers? Explain.
A clinical trial is run to investigate the effectiveness of an experimental drug in reducing preterm delivery to a drug considered standard care and to placebo. Pregnant women are enrolled and randomly assigned to receive either the experimental drug, the standard drug or a placebo. Women are followed through delivery and classified as delivering preterm (< 37 weeks) or not. The data are shown below. Preterm Delivery Experimental Drug Standard Drug Placebo Yes 17 23 35 No 83 77 65 Is there a statistically significant difference in the proportions of women delivering preterm among the three treatment groups? Run the test at a 5% le significance.
A 1-1 matched case-control study was conducted among office workers on the association between suffering chronic lower back pain and sitting at a PC. There were 118 cases (suffering from back pain), individually matched to controls (not suffering from back pain) on sex, age, and general exercise habits. The exposure was the amount of time spent at a PC. The data are in Table 1: Case > 4 hours/day 4 hours/day 18 13 <4 hours/day 25 62 Use a suitable test to test for no association between suffering chronic lower back pain and time spent sitting at a PC.
A researcher wanted to find the effect of a special diet on systolic blood pressure. She selected a sample of seven adults and put them on this dietary plan for 3 months. The following table gives the systolic blood pressures (in mm Hg) of these seven adults before and after the com- pletion of this plan. Before After 210 193 180 186 195 186 220 223 231 220 199 183 224 233 Let u be the mean reduction in the systolic blood pressures due to this special dietary plan for the population of all adults. Construct a 95% confidence interval for ud. Assume that the population of paired differences is (approximately) normally distributed.
A test is being designed to compare the wearing quality of two brands of tires, say brand A and brand B. Six automobiles will be selected and equipped with the new tires from both brands and driven under normal conditions for 1 month. A measurement will be taken to determine how much wear took place on a scale from 0 to 200. Below is a table of the paired data collected from the 6 cars in the test. [BrandA BrandB] 125 64 64 65 94 103 38 37 90 102 106 115 Conduct a hypothesis test to determine whether the mean of the difference population is 0 at a significance level of a =. State your conclusion.