Homework Answers
This page consists of answer to part a
This page contains the answer part b
This page contains the answer to part c . It also has the answer to the Error sum of square calculation part.
This page contains the answer to the remaining (confidence limits) portion of part d.
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8.The following results were obtained from a survey carried out by professor Socrates The survey ...
1. A survey of the income of 9 students was conducted and the results are shown...
1. A survey of the income of 9 students was conducted and the results are shown in the table below. 21342 22356 28624 12455 15487 16489 14596 25624 52483 Compute the mean and median of the above data. 2. Find the five-number summary and construct a boxplot for the following data: 12, 31, 23, 8, 23, 11, 33, 17, 28, 23, 23, 16 3. World truck production (fictional) 1985 1986 1987 1988 Year x Trucks y (millions) 1984 15.9 16.3...
A chemist is calibrating a spectrophotometer by measuring samples of known concentrations. The results are given...
A chemist is calibrating a spectrophotometer by measuring samples of known concentrations. The results are given in the table below. 1. True (ppm) Meas (ppm) 0 10 20 30 40 50 60 70 80 90 100 1 11 21 28 37 48 56 68 75 86 96 Because of random errors repeated measurements on the same sample will vary. You can assume that the errors are independent and approximately normal. The machine is in calibration if the average measurement equals...
Use the following information to answer questions 1-8. A statistics professor wishes to investigate the relation...
Use the following information to answer questions 1-8. A statistics professor wishes to investigate the relation between a student’s final course grade and grades on a midterm and a major project. A random sample of 10 students is taken. X1 X2 Y Midterm Project Course Grade 88 90 83 95 80 83 91 80 92 94 93 94 95 90 89 93 58 77 91 90 91 87 74 73 82 92 70 87 74 75 The Excel output for the regression...
eBook Video Exercise 10.1 (Algorithmic)) Consider the following results for two independent random samples taken from...
eBook Video Exercise 10.1 (Algorithmic)) Consider the following results for two independent random samples taken from two populations. Sample 1 Sample 2 n 50 n2 35 1-1=13.6 X2= 11.1 a. What is the point estimate of the difference between the two population means? | b. Provide a 90% confidence interval for the difference between the two population means (to 2 decimals). c Provide a 95% confidence interval for the difference between the two population means to 2 decimals eBook Video...
The following ANOVA model is for a multiple regression model with two independent variables: Degrees of Sum of Mean Source Freedom Squares ...
The following ANOVA model is for a multiple regression model
with two independent variables:
Degrees
of
Sum
of
Mean
Source
Freedom
Squares
Squares
F
Regression
2
60
Error
18
120
Total
20
180
Determine the Regression Mean Square (MSR):
Determine the Mean Square Error (MSE):
Compute the overall Fstat test statistic.
Is the Fstat significant at the 0.05 level?
A linear regression was run on auto sales relative to consumer
income. The Regression Sum of Squares (SSR) was 360 and...
TEST 1: ANSWERS INTS EACH). This section takes around 5 minutes. Name Spring 2019 8) A researcher wants to determine whether female teachers give higher or lower grades, on average, then male t...
TEST 1: ANSWERS INTS EACH). This section takes around 5 minutes. Name Spring 2019 8) A researcher wants to determine whether female teachers give higher or lower grades, on average, then male teachers. She picks a random sample by picking a random sample of schools, in the schools picked, picking a random sample of departments, and in the departments picked, picking a random sample of teachers. What kind of sampling was performed? d) voluntary response e) cluster b) stratified Random...
1. Many companies use a incoming shipments of parts, raw materials, and so on. In the...
1. Many companies use a incoming shipments of parts, raw materials, and so on. In the electronics industry, component parts are commonly shipped from suppliers in large lots. Inspection of a sample of n components can be viewed as the n trials of a binomial experimem. The outcome for each component tested (trialD will be that the component is classified as good or defective defective components in the lot do not exceed 1 %. Suppose a random sample of fiver...
Problem 1 (Short Answer) Answer the following questions in 2-4 sentences: a) Describe how uncertainty plays...
Problem 1 (Short Answer) Answer the following questions in 2-4 sentences: a) Describe how uncertainty plays a role in engineering measurements and experiments b) Explain what the variance of a dataset or random variable represents. c) Explain why normal distributions and normal random variables are used very commonly in engineering practice Describe what is meant by the rejection region of an alternative hypothesis, and sketch the rejection regions for the right-sided, left-sided, and two-sided alternatives d) Problem 2 (Health Data...
All of the following questions are in relation to the following journal article which is available...
All of the following questions are in relation to the following journal article which is available on Moodle: Parr CL, Magnus MC, Karlstad O, Holvik K, Lund-Blix NA, Jaugen M, et al. Vitamin A and D intake in pregnancy, infant supplementation and asthma development: the Norwegian Mother and Child Cohort. Am J Clin Nutr 2018:107:789-798 QUESTIONS: 1. State one hypothesis the author's proposed in the manuscript. 2. There is previous research that shows that adequate Vitamin A intake is required...
1. A survey of the income of 9 students was conducted and the results are shown in the table below. 21342 22356 28624 12455 15487 16489 14596 25624 52483 Compute the mean and median of the above data. 2. Find the five-number summary and construct a boxplot for the following data: 12, 31, 23, 8, 23, 11, 33, 17, 28, 23, 23, 16 3. World truck production (fictional) 1985 1986 1987 1988 Year x Trucks y (millions) 1984 15.9 16.3...
A chemist is calibrating a spectrophotometer by measuring samples of known concentrations. The results are given in the table below. 1. True (ppm) Meas (ppm) 0 10 20 30 40 50 60 70 80 90 100 1 11 21 28 37 48 56 68 75 86 96 Because of random errors repeated measurements on the same sample will vary. You can assume that the errors are independent and approximately normal. The machine is in calibration if the average measurement equals...
eBook Video Exercise 10.1 (Algorithmic)) Consider the following results for two independent random samples taken from two populations. Sample 1 Sample 2 n 50 n2 35 1-1=13.6 X2= 11.1 a. What is the point estimate of the difference between the two population means? | b. Provide a 90% confidence interval for the difference between the two population means (to 2 decimals). c Provide a 95% confidence interval for the difference between the two population means to 2 decimals eBook Video...
The following ANOVA model is for a multiple regression model
with two independent variables:
Degrees
of
Sum
of
Mean
Source
Freedom
Squares
Squares
F
Regression
2
60
Error
18
120
Total
20
180
Determine the Regression Mean Square (MSR):
Determine the Mean Square Error (MSE):
Compute the overall Fstat test statistic.
Is the Fstat significant at the 0.05 level?
A linear regression was run on auto sales relative to consumer
income. The Regression Sum of Squares (SSR) was 360 and...
TEST 1: ANSWERS INTS EACH). This section takes around 5 minutes. Name Spring 2019 8) A researcher wants to determine whether female teachers give higher or lower grades, on average, then male teachers. She picks a random sample by picking a random sample of schools, in the schools picked, picking a random sample of departments, and in the departments picked, picking a random sample of teachers. What kind of sampling was performed? d) voluntary response e) cluster b) stratified Random...
1. Many companies use a incoming shipments of parts, raw materials, and so on. In the electronics industry, component parts are commonly shipped from suppliers in large lots. Inspection of a sample of n components can be viewed as the n trials of a binomial experimem. The outcome for each component tested (trialD will be that the component is classified as good or defective defective components in the lot do not exceed 1 %. Suppose a random sample of fiver...
Problem 1 (Short Answer) Answer the following questions in 2-4 sentences: a) Describe how uncertainty plays a role in engineering measurements and experiments b) Explain what the variance of a dataset or random variable represents. c) Explain why normal distributions and normal random variables are used very commonly in engineering practice Describe what is meant by the rejection region of an alternative hypothesis, and sketch the rejection regions for the right-sided, left-sided, and two-sided alternatives d) Problem 2 (Health Data...
All of the following questions are in relation to the following journal article which is available on Moodle: Parr CL, Magnus MC, Karlstad O, Holvik K, Lund-Blix NA, Jaugen M, et al. Vitamin A and D intake in pregnancy, infant supplementation and asthma development: the Norwegian Mother and Child Cohort. Am J Clin Nutr 2018:107:789-798 QUESTIONS: 1. State one hypothesis the author's proposed in the manuscript. 2. There is previous research that shows that adequate Vitamin A intake is required...
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