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24 Aug
2020

A sociologist is studying the age of the population in Blue Valley. Ten years…

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A sociologist is studying the age of the population in Blue Valley. Ten years ago, the population was such that 20% were under 20 years old, 10% were in the 20- to 35-year-old bracket, 34% were between 36 and 50, 24% were between 51 and 65, and 12% were over 65. A study done this year used a random sample of 210 residents. This sample is given below. At the 0.01 level of significance, has the age distribution of the population of Blue Valley changed?Under 20 20 – 35 36 – 50 51 – 65 Over 65 29 25 65 67 24(i) Give the value of the level of significance.State the null and alternate hypotheses.H0: Time ten years ago and today are independent.H1: Time ten years ago and today are not independent.H0: The distributions for the population 10 years ago and the population today are the same.H1: The distributions for the population 10 years ago and the population today are different. H0: The population 10 years ago and the population today are independent.H1: The population 10 years ago and the population today are not independent.H0: Ages under 20 years old, 20- to 35-year-old, between 36 and 50, between 51 and 65, and over 65 are independent.H1: Ages under 20 years old, 20- to 35-year-old, between 36 and 50, between 51 and 65, and over 65 are not independent.(ii) Find the sample test statistic. (Round your answer to two decimal places.)(iii) Find or estimate the P-value of the sample test statistic. (Round your answer to three decimal places.)(iv) Conclude the test.Since P-value
a. b. c. What is the relation between probability and normal distribution?The quality grade point averages of 300 college freshmen
a. b. c. What is the relation between probability and normal distribution?The quality grade point averages of 300 college freshmen follow approximately a normal distribution with a mean of 2.1 and standard deviation of 0.8. How many of these freshmen would you expect to have a score between 2.5 and 3.5 inclusive if the point averages are computed to the nearest tenth.Take 10 values at random of and then find mean, standard deviation of that set. Also find a point which covers no more than 5% of data with the help of normal distribution.
A- B- C- What is the relation between probability and normal distribution?The quality grade point averages of 300 college freshmen
A- B- C- What is the relation between probability and normal distribution?The quality grade point averages of 300 college freshmen follow approximately a normal distribution with a mean of 2.1 and standard deviation of 0.8. How many of these freshmen would you expect to have a score between 2.5 and 3.5 inclusive if the point averages are computed to the nearest tenth.Take 10 values at random of x and then find mean, standard deviation of that set. Also find a point which covers no more than 5% of data with the help of normal distribution.
a. b. c. On his journey to school, Joe’s school bus must pass through three sets of traffic lights which
a. b. c. On his journey to school, Joe’s school bus must pass through three sets of traffic lights which are equally likely to be red or green. What is the probability that the first two lights will be green and the third one red?A spinner used in a game has 10 sections, of which 5 are colored Red, 3 Green and 2 blue. The spinner is spun 2 times. What is the probability of obtaining a Red and a Blue?Identify which situation follows a normal probability distribution with reasons: i. Weights of BSCS students in a class. ii. Balls of red color in a box. iii. Filling of jam in a jar of 500g from a machine. iv. Recovery of CORONA patient in Pakistan.
Provide some examples of discrete and continuous variables. What attributes of these variables make them discrete and continuous? Why?Discrete variables-
Religion and Theology Assignment Writing ServiceProvide some examples of discrete and continuous variables. What attributes of these variables make them discrete and continuous? Why?Discrete variables- the value of the variable is found in whole numbers by counting. Examples: # of red candies in a jar, # of students in a class, Gender of students in the class etc…Continuous variables- the value of the variable is found by measuring and can contain decimals. Examples : Distance, time, height, weight etc… References:Lind, D. A., Marchal, W. G.,
a. b. c. Explain how the null hypothesis and the alternative hypothesis formulated.Distinguish between the concept a test at a
a. b. c. Explain how the null hypothesis and the alternative hypothesis formulated.Distinguish between the concept a test at a (alpha) level of significance and at (1- a ) confidence level. A random sample of 16 values form a normal distribution gave means 42inches and sum of squared deviations from mean is 135 . Test the hypothesis that mean in population is 43.5 inches.
You are the foreman of the Bar-S cattle ranch in Colorado. A neighboring ranch has calves for sale, and you
You are the foreman of the Bar-S cattle ranch in Colorado. A neighboring ranch has calves for sale, and you are going to buy some calves to add to the Bar-S herd. How much should a healthy calf weigh? Let x be the age of the calf (in weeks), and let y be the weight of the calf (in kilograms).x 2 5 11 16 26 36y 43 45 71 100 150 200Complete parts (a) through (e), given Σx = 96, Σy = 609, Σx2 = 2378, Σy2 = 81,415, Σxy = 13,792, and r ≈ 0.996.(a) Draw a scatter diagram displaying the data.(b) Verify the given sums Σx, Σy, Σx2, Σy2, Σxy, and the value of the sample correlation coefficient r. (Round your value for r to three decimal places.)Σx =Σy =Σx2 =Σy2 =Σxy =r =(c) Find x, and y. Then find the equation of the least-squares line = a bx. (Round your answers for x and y to two decimal places. Round your answers for a and b to three decimal places.)x= y= ^y= x(d) Graph the least-squares line. Be sure to plot the point (x, y) as a point on the line.(e) Find the value of the coefficient of determination r2. What percentage of the variation in y can be explained by the corresponding variation in x and the least-squares line? What percentage is unexplained? (Round your answer for r2 to three decimal places. Round your answers for the percentages to one decimal place.)r2 =explained %unexplained %(f) The calves you want to buy are 19 weeks old. What does the least-squares line predict for a healthy weight? (Round your answer to two decimal places.) kg
Find Solutions For Your Homework businessoperations managementoperations management questions and answersCASE STUDY – DATA COLLECTION METHODS ZOOM CASE CHAPTER 9:
Find Solutions For Your Homework businessoperations managementoperations management questions and answersCASE STUDY – DATA COLLECTION METHODS ZOOM CASE CHAPTER 9: DATA COLLECTION METHODS AN ONLINE …Question: CASE STUDY – DATA COLLECTION METHODS ZOOM CASE CHAPTER 9: DATA COLLECTION METHODS AN ONLINE SHOPPING QUESTIONNAIRE Dear Respondent, I Am Final Year Student Studying Business Information Technology (BIT) . For My Research Project I Am Conducting A Survey Related To Online Buying. It Would Be Great If You Could Answer Some Questions About This Topic. …This problem has been solved!See the answerCASE STUDY – DATA COLLECTION METHODSZOOMCASE CHAPTER 9: DATA COLLECTION METHODSAN ONLINE SHOPPING QUESTIONNAIREDear Respondent,I am final year student studying Business Information Technology (BIT) . For my research project I am conducting a survey related to online buying. It would be great if you could answer some questions about this topic.There are no right or wrong answers and your responses will remain strictlyconfidential. This survey will take only 10 minutes of your time.Kind regards,Nicki Sörensen.1 Age18 to 25 years oldOver 26 years old 2 GenderMaleFemale3 How much is your weekly income? (Average in past 6 months)£50 or lower£51 to £100£101 to £150£151 to £200More than £2004 Where do you frequently have access to the internet? (Please select which is appropriate)HomeOfficeUniversity Campus5 How many hours per week do you spend online? (Average in past 6 months)More than 20 hours16 to 20 hours11 to 15 hours6 to 10 hours1 to 5 hoursLess than 1 hour6 How long have you been using internet services?More than 10 years6 to 10 years4 to 6 years1 to 4 yearsLess than 1 year7 What do you normally use the internet for?8 Have you ever visited any online shopping website?YesNoIf your answer is “No”, please jump to question 119 How often do you buy products through online shopping on average?Once a week or more oftenOnce a monthOnce every 2-3 months (4-6 times a year)Once every 4-6 months (2-3 times a year)Once every 6 -12 months (Once a year)10 How much on average have you spent on online shopping in past 6 months per order?£1 to £20£21 to £50£51 to £100£101 to £200More than £20011 What kind of stuff do you buy online?12 Why do you purchase goods online? (Please provide 3 most important reasons).13 What are the reasons you do not purchase products or services through the internet?(Please provide 3 most important reasons)Strongly AgreeSlightly AgreeNeitherSlightly DisagreeStrongly Disagree14It is easy to shop online15It is enjoyable to shop online16It is not unsafe to shop17It is easy to compare products and prices of product18Shopping online saves time19Products l buy online might fail to meet my expectations20I might lose my money when I buy products online21Online shopping might have a negative effect on my peace of mind22Online shopping increases theopportunity costs of traditional shopping23It is a great advantage to be able to shop at any time of the day on the internet.24Selection of goods available on the internet is very broad25Websites provide sufficient productinformation and explanation26Feel free to give any other comments:Thanks for filling in this survey. It is very much appreciated.The primary purpose of Nicki’s questionnaire was to gain insight into people’s attitudes toward online shopping. For this reason Nicki has posted invitations to participate in a survey on awide variety of social networks, discussion groups, and chat rooms. In order to determine theattributes relevant to his study he has carried out face-to-face interviews. Based on a rigorousanalysis of these interviews Nicki has developed the above questionnaire.QUESTIONS1. Discuss the advantages and disadvantages of posting invitations to participate in asurvey on social networks, discussion groups, and chat rooms using mail questionnaires.2. The response rates to online questionnaires are typically low. What can Nicki do toincrease the response rate to his survey?3. Evaluate the introduction of Nicki’s questionnaire and improve it if (and where)necessary.Nicki’s questionnaire starts with questions seeking personal information of the respondents.However, some researchers ask for personal data at the end rather than the beginning of thequestionnaire.4a. Discuss both viewpoints.4b. What do you prefer? Explain why.Nicki uses a lot of closed questions. Closed questions ask respondents to make choicesamong a set of alternatives given by the researcher. Care has to be taken to ensure that thealternatives are mutually exclusive and collective exhaustive.5. Verify whether all the closed questions in Nicki’s questionnaire are mutuallyexclusive and collectively exhaustive.Submit questionnairePoor phrasing of questions can cause respondents to refuse to answer them or to answerincorrectly (either on purpose or because of misunderstanding).6. Evaluate the phrasing of Nicki’s questions.7. Nicki has conducted face-to-face interviews to determine the attributes relevant to hisstudy. Discuss the advantages and disadvantages of face-to-face interviews.
1) You want to obtain a sample to estimate a population mean. Based on previous evidence, you believe the population
1) You want to obtain a sample to estimate a population mean. Based on previous evidence, you believe the population standard deviation is approximately σ=42.7. You would like to be 99% confident that your esimate is within 2.5 of the true population mean. How large of a sample size is required?n=Do not round mid-calculation. However, use a critical z value accurate to two (2) decimal places.2) According to a study, 80 % of adult smokers started smoking before 21 years old. 8 smokers 21 years old or older are randomly selected, and the number of smokers who started smoking before 21 is recorded.The probability that at least 4 of them started smoking before 21 years of age is ____The probability that at most 7 of them started smoking before 21 years of age is ____ The probability that exactly 6 of them started smoking before 21 years of age is ____3) In conducting the hypothesis test below, your sample consists of 15 observations, with a mean of 57.5 and standard deviation of 1.08.H0:μ≤57H1:μ
67 percent of the customers of a fast food chain order the Whopper, French fries and a drink. A random
67 percent of the customers of a fast food chain order the Whopper, French fries and a drink. A random sample of 17 cash register receipts is selected. What is the probability that eight receipts will show that the above three food items were ordered? (Round the result to five decimal places if needed.)
The records of a computer retail store show that out of the 25 customers who purchased a desktop computer last
The records of a computer retail store show that out of the 25 customers who purchased a desktop computer last month, all but 7 also purchased a service plan that extends the warranty for an extra year. Out of the 50 customers who purchased a notebook computer last month, all but 11 purchased the same service plan.Fill in the blanks of the statement below to make the statement the most reasonable possible.Last month, customers of the store who purchased ?desktopnotebook computers were less likely to purchase the service plan, because only % purchased the service plan, whereas % of the customers who bought ?desktopnotebook computers purchased the service plan.

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