Hi, Hope you are well! I'm back with STATS and MATHS for 2016 and 2017. This may result in 2 to 4 consultations with you on a weekly basis. Cannot offer as much money as in the past due to the exchange rate, but will be a weekly client again for next year or two. ************** I am not sure if you will be able to help with STATS on FRIDAYS. Each Friday, I will only be able to give you around 3 hours max after I've received my information, before I have to upload on my system. I will (like when you helped me in 2014), need the answers as soon as possible, BUT then you can take more time in the step-by-step explanations. I need the step-by-step in order to understand everything clearly. For this week, I already have the information, and thus need it within 30 hours, but for next week, we may have less time, especially on Fridays. Will you be able to assist again? _________________________________________________________ a) Random question for Maths (step-by-step please) Let F(t) = Mat . If f(2) = 60 and f(5) = 90, determine M. __________________________________________________________ Please see underneath: I AM GIVING YOU ALSO THE TABLES THEY WANT US TO USE: RANDOM NUMBERS TO USE IN CHAPTER 1 Please scroll down for the rest of the information. STATS P1 - Need within 30 hours please (Step-by-Step) 1. The following table represents the number of students registered for a specific course at various universities. University Number of Students A 880 B 540 C 720 D 460 A sample size of 260 students must be drawn from this population of students. If a proportional random sample is taken from each strata, give the relevant sub-sample size for all the Universities 2. Your statistics lecturer decides to select a random sample of 226 EBCS 1514 students to complete a questionnaire. The number of students in each of the 6 lecturer's classes is given in the table below. If a proportional random sample is drawn from each class, what is the sample size for each lecturer? Lecturer 1 2 3 4 5 6 Number of students 420 380 240 480 490 250 The following is an inventory of 60 kinds of decadent chocolate at a chocolate deli. The owner of the deli wants to draw a sample to double check if the number of chocolates in stock noted by the manager is correct. 3. Kind 1 2 3 4 5 6 7 8 9 10 11 12 Number in Stock 14 13 66 35 72 21 58 41 82 15 18 16 Kind 13 14 15 16 17 18 19 20 21 22 23 24 Number in Stock 27 50 78 94 82 38 53 95 49 14 54 56 Kind 25 26 27 28 29 30 31 32 33 34 35 36 Number in Stock 86 77 30 66 90 22 67 25 89 68 70 70 Kind 37 38 39 40 41 42 43 44 45 46 47 48 Number in Stock 93 59 93 04 48 36 14 40 10 45 53 44 Kind 49 50 51 52 53 54 55 56 57 58 59 60 3.1 Select a random sample of 5 items by using the random numbers. Start at row 24, column 12 and read from left to right on the 1st page. Number in Stock 95 49 14 54 56 30 31 21 58 41 55 51 3.2 Give the number in stock corresponding with the random numbers given above. 4. The following is the entire extended inventory of Jake's Bookbinding Company (500 items): Ite m 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 Recorded Amount (in R) 1 140 9 130 660 3 355 5 725 8 210 580 4 410 825 1 155 2 270 50 5 785 940 1 820 3 380 530 955 19 4 490 20 1 140 Item 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39.... . 500 Recorded Amount (in R) 4 865 770 2 305 2 665 1 000 6 225 3 675 6 250 1 890 2 705 935 5 595 930 4 045 9 480 360 1 145 6 400 100 8 435 4.1 The owner selects a random sample of 10 items by using the 1 st page of random numbers. By starting at row 13, column 9 and reading from left to right, what are the random numbers chosen by the owner? 4.2 If a systematic random sampling is used to select a sample of 35 from the above population of 500, give the first 5 elements. Start reading at row 14 column 11 and read vertically from top to bottom by using 2 digits less or equal to k 5. The price of your most recent haircut is a quantitative, discrete variable. A) incorrect B) correct 6. Your travel time from your home to the examination centre is a quantitative, continuous variable. A) incorrect B) correct 7. The shelf life of milk A) Nominal B) Ordinal C) Discrete D) Continuous The number of pages in a textbook. A) Nominal B) Ordinal C) Discrete D) Continuous The wood types that can be used to make a desk. A) Nominal B) Ordinal C) Discrete D) Continuous The number of loaves of bread sold daily by a bakery. A) Nominal B) Ordinal C) Discrete D) Continuous The number of life policies issued per day. A) Nominal B) Ordinal C) Discrete D) Continuous The area of a shop floor. A) Nominal B) Ordinal C) Discrete D) Continuous The flavours available in Cat food chunks. A) Nominal B) Ordinal C) Discrete D) Continuous The size categories for shoes. A) Nominal B) Ordinal D) Continuous 8. 9. 10. 11. 12. 13. 14. C) Discrete 15. \"Gender\" is a dual question A) True B) False 16. Multiple choice questions can have one response A) True B) False NEXT PAGE PLEASE T 1 - need within 30 hours step-by-step Save and Submit Question 1 1. Whether or not you own a radio is a qualitative variable. incorre ct correct 1 points Question 2 1. Your status as either a full-time or part-time worker is a quantitative variable. incorre ct correct 1 points Question 3 1. The number of people at the cricket match is a quantitative, discrete variable. incorre ct correct 1 points Question 4 1. The price of your handbooks is a quantitative, discrete variable. incorre ct correct 1 points Question 5 1. Your travel time from your home to the varsity is a quantitative, continuous variable. incorre ct correct 1 points Question 6 1. The shelf life of bread at the supermarket. Nominal Ordinal Discrete Continuo us 1 points Question 7 1. The number of pages in your stats textbook. Nominal Ordinal Discrete Continuo us 1 points Question 8 1. The wood types that can used to make a desk is: Nominal Ordinal Discrete Continuo us 1 points Question 9 1. The number of loaves of bread sold weekly by a shop. Nominal Ordinal Discrete Continuo us 1 points Question 10 1. The number of life policies issued per day. Nominal Ordinal Discrete Continuous 1 points Question 11 1. The area of a house floor. Nominal Ordinal Discrete Continuo us 1 points Question 12 1. The flavours available in cat food chunks. Nominal Ordinal Discrete Continuo us 1 points Question 13 1. The size categories for shoes. Nominal Ordinal Discrete Continuo us 1 points Question 14 1. The voltage produced by a generator. Nominal Ordinal Discrete Continuo us 1 points Question 15 1. The car types in the BMW range. Nominal Ordinal Discrete Continuo us 1 points Question 16 1. The yes/no/sometimes response to \"Do you drink brandy\" Nominal Ordinal Discrete Continuo us 1 points Question 17 1. The income per day of a bookshop. Nominal Ordinal Discrete Continuo us 1 points Question 18 1. The weekly birth rate at a maternity hospital. Nominal Ordinal Discrete Continuo us 1 points Question 19 1. The mass of babies at birth. Nominal Ordinal Discrete Continuo us 1 points Question 20 1. The daily distance travelled by a courier service truck. Nominal Ordinal Discrete Continuo us 1 points Question 21 1. The names of teams in a cricket league. Nominal Ordinal Discrete Continuo us 1 points Question 22 1. Which of the following is a reason for the need for sampling? It is usually not too costly to study the whole population. It is usually not too time consuming to look at the whole population. It is sometimes destructive to observe the entire population. It is always more informative by investigating a sample than the entire population. 1 points Question 23 1. Which of the following is a reason for selecting a sample? A sample is more time consuming than a census. A sample is more costly to administer than a census. A sample is usually not a good representation of the target population. A sample is less cumbersome and more practical to administer. 1 points Question 24 1. Which of the following sampling methods is not a nonprobability sample? convenience sample quota sample stratified sample judgment sample 1 points Question 25 1. Which of the following scenarios will yield a nonprobability sample? The subjects of the sample are chosen on the basis of known probability. Items or individuals are chosen without regard to their probability of occurrence. Every individual has an equal chance of being selected. Selection may be with replacement or without replacement. Decide on a sample size, n; divide the frame of N individuals into groups of k individuals where k = N/n; randomly select one individual from the first group; select every k-th individual thereafter. 1 points Question 26 1. To obtain a sample of 20 books in the store, the manager walked to the first shelf next to the cash register to pick the first 20 books on that shelf. This is an example of a systematic sample. simple random sample. stratified sample. convenience sample. 1 points Question 27 1. The lecturer in a class picked the first five students sitting in the first row of the class. This is an example of a systematic sample. simple random sample. stratified sample. convenience sample. 1 points Question 28 1. A company selling apparel online sends out emails every Monday to all its customers who made a purchase. This is an example of a systematic sample. convenience sample. simple random sample. stratified sample. 1 points Question 29 1. Which of the following yields a systematic sample? All students in a class are divided into groups of 20. One student is randomly chosen from the first group, the remaining observations are every 20th student thereafter. The best 20 students, according to the opinion of the instructor, in a class are selected. All students in a class are grouped according to their gender. A random sample of 10 is selected from the males and a separate random sample of 10 is drawn from the females. A random sample of 20 students is selected from a class without replacement. 1 points Question 30 1. Which of the following yields a stratified sample? All students in a class are divided into groups of 30. One student is randomly chosen from the first group, the remaining observations are every 30th student thereafter. The best 30 students, according to the opinion of the instructor, in a class are selected. All students in a class are grouped according to their gender. A random sample of 15 is selected from the males and a separate random sample of 15 is drawn from the females. The first 30 students in a class are selected without replacement. 1 points Question 31 1. Which of the following yields a simple random sample? All students in a class are divided into groups of 40. One student is randomly chosen from the first group, the remaining observations are every 40th student thereafter. The best 40 students, according to the opinion of the instructor, in a class are selected. The names of 100 students in a class are written on 100 different pieces of paper and put in a hat. The first 40 pieces of paper are selected blindly one at a time without replacing them back in the hat after shuffling the papers thoroughly. All students in a class are divided into groups according to the rows in which they are seated. One of the groups is randomly selected. 1 points Question 32 1. To make valid statistical inferences from a sample to a population, you use:? a judgment sample a quota sample a convenience sample a probability sample 1 points Question 33 1. The evening host of a dinner dance reached into a bowl, mixed all the tickets around, and selected the ticket to award the grand door prize. What sampling method was used? simple random sample systematic sample stratified sample cluster sample 1 points Question 34 1. The Dean of Students mailed a survey to a total of 500 students. The sample included 100 students randomly selected from each of the freshman, sophomore, junior, and senior classes on campus last term. What sampling method was used? simple random sample systematic sample stratified sample cluster sample 1 points Question 35 1. A telemarketer set the company's computerized dialing system to contact every 20th person listed in the local telephone directory. What sampling method was used? simple random sample systematic sample stratified sample cluster sample 1 points Question 36 1. If a simple random sample is chosen, each individual has the same chance of selection. True False 1 points Question 37 1. The only reliable way a researcher can make statistical inferences from a sample to a population is to use nonprobability sampling methods. True False 1 points Question 38 1. A sample is always a good representation of the population. True False 1 points Question 39 1. You can only select one sample from a population. True False 1 points Question 40 1. Systematic samples are more efficient than a stratified sample. True False 1 points Question 41 1. Among the 50 students in a class, 20% were freshmen, 50% were sophomores and 30% were juniors. You decided to select 2 students randomly from the freshmen, 5 randomly from the sophomores and 3 randomly from the juniors. This is an example of a systematic sample. True False 1 points Question 42 1. If you randomly select a student from the first row of a business statistics class and then every other fifth student thereafter until you get a sample of 30 students, this is an example of a systematic sample. True False 1 points Question 43 1. You stand at the main entrance to a department store and pick the first 10 customers that enter the store after it has opened its door for business on a single day. This is an example of a systematic sample. True False 1 points Question 44 1. \"Do you have a Radio-set\"? is a dual question True False 1 points Question 45 1. \"Gender\" is a dual question True False 1 points Question 46 1. Multiple choice questions can have one response True False 1 points Question 47 1. Multiple choice questions can have more than one response True False 1 points Question 48 1. \"Your opinion of the quality of our product\" Low Quality 1 2 3 2. Is a semantic differential scale? 4 5 High Quality 3. True 4. False 1 points Question 49 1. \"What is the probability of investing in the stock-market within the next year\" Will definitely invest Strong possibility of investing Will possibly invest Slim chance of investing Will definitely not invest 2. 3. Is a scale of preference? True 4. False 1 points Question 50 1. An open question elicits answers in the respondent's own words. True False 1 points Question 51 1. An open question can be asked if all possible answers to a certain question are not known or comprise an extensive collection. True False 1 points Question 52 1. \"In your opinion, what things are good or bad about the BAC Company as a place to work?\" is an open question. True False 1 points Question 53 1. \"If you invest in the stock market, why do you prefer this form of investment above other investment opportunities\" is an open question. True False 1 points Question 54 1. A questionnaire must look attractive. Use a good quality paper and a letter type that is easy to read. True False 1 points Question 55 1. The use of coloured paper (one or several colours) enhances the appearance of the questionnaire. True False 1 points Question 56 1. Instructions given to the respondents must be clear and explicit. True False 1 points Question 57 1. The questionnaire must be reasonably short ; two papers are ideal. True False 1 points Question 58 1. Spacing should be as such that it is easy to complete the questionnaire. True False 1 points Question 59 1. Provide the questionnaire in the mother-tongue of the respondents whenever it is possible. True False 1 points Question 60 1. The first questions should be interesting to catch the respondent's attention. True False 1 points Question 61 1. Begin with questions people will not mind answering and put the more controversial questions near the end. True False 1 points Question 62 1. Which of the following is not an element of descriptive statistical problems? An inference made about the population based on the sample. The population or sample of interest. Tables, graphs, or numerical summary tools. Identification of patterns in the data. 1 points Question 63 1. Those methods involving the collection, presentation, and characterization of a set of data in order to properly describe the various features of that set of data are called statistical inference. the scientific method. sampling. descriptive statistics. 1 points Question 64 1. Most analysts focus on the cost of tuition as the way to measure the cost of a university education. But incidentals, such as textbook costs, are rarely considered. A researcher at Free State University wishes to estimate the textbook costs of first-year students at UFS. To do so, he monitored the textbook cost of 500 first-year students and found that their average textbook cost was R 500 per semester. Identify the population of interest to the researcher. All Free State University students. All UFS students. All first-year Free State University students. The 500 students that were monitored. 1 points Question 65 1. A statistic is usually used to provide an estimate for a usually unobserved parameter. True False 1 points Question 66 1. Most analysts focus on the cost of tuition as the way to measure the cost of a university education. But incidentals, such as textbook costs, are rarely considered. A researcher at Free State University wishes to estimate the textbook costs of first-year students at UFS. To do so, she monitored the textbook cost of 500 first-year students and found that their average textbook cost was R 500 per semester. Identify the sample in the study. All Free State University students. All college students. All first-year Free State University students. The 250 students that were monitored. 1 points Question 67 1. The process of using sample statistics to draw conclusions about true population parameters is called statistical inference. the scientific method. sampling. descriptive statistics. 1 points Question 68 1. The universe or "totality of items or things" under consideration is called a sample. a populatio n. a parameter . a statistic. 1 points Question 69 1. The chancellor of a major university was concerned about alcohol abuse on her campus and wanted to find out the proportion of students at his university who visited campus bars on the weekend before the final exam week. His assistant took a random sample of 500 students. The portion of students in the sample who visited campus bars on the weekend before the final exam week is an example of ________. a populatio n. a sample. a parameter . a statistic. \f