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The daily production of a chemical product last week in tons was: 785, 805, 790, 793,...
A new engineer joins the company and skeptical about OMI's historical data of daily production process...
A new engineer joins the company and skeptical about OMI's historical data of daily production process that it is ~ N (700, 50). He takes a random sample of 64 daily production from last nine month's production and he calculates the sample mean as 685 and sample standard deviation as 56. He wants to calculate a 95 % confidence interval for his estimation of daily production mean before he goes to his manager and questions current assumptions. What are the...
2. In estimating the mean number of television viewing hours per family per week, a random...
2. In estimating the mean number of television viewing hours per family per week, a random sample of 400 families yields a mean of 32.6 hours and a standard deviation of 9.9 hours (a) Find a 95% confidence interval for the average number of viewing hours per family per week in the population. Interpret. (b) Find a 99% confidence interval for the average number of viewing hours per family per week in the population. Interpret. (c) Suppose instead only 25...
Q12. a) Suppose the given confidence interval estimates the true population mean as 3.5<μ<13.1 with a...
Q12. a) Suppose the given confidence interval estimates the true population mean as 3.5<μ<13.1 with a 95% level of confidence when σ is known. (i) Find the point estimates for the unknown population mean. (ii) Find the margin of error. (iii) Give the interpretation of the confidence interval. (iv) Name two ways of decreasing the width of the confidence interval. b) State the assumptions necessary for linear regression model Y=A+Bx+ε c) Let p^ be a sample proportion based on a...
5. For a random sample of 50 households with gas stoves monitored over a week, the...
5. For a random sample of 50 households with gas stoves monitored over a week, the sample mean CO2 level (ppm) in the households was -654.16, and the sample standard deviation was s 164.43. a. Check if the CLT (central limit theorem) applies and show the two assumptions that you check. b. Calculate a 95% (two-sided) confidence interval for true average CO2 level in the population of households with gas stoves. c. Interpret your CI from b. d. Suppose the...
Q12. a) Suppose the given confidence interval estimates the true population mean as 3.5 < u...
Q12. a) Suppose the given confidence interval estimates the true population mean as 3.5 < u < 13.1 with a 95% level of confidence when o is known. (1) Find the point estimates for the unknown population mean. (ii) Find the margin of error. (iii) Give the interpretation of the confidence interval. (iv) Name two ways of decreasing the width of the confidence interval. b) State the assumptions necessary for linear regression model Y = A + Bx + E...
1. Twenty male athletes were given a special candy bar daily for several weeks, and each...
1. Twenty male athletes were given a special candy bar daily for several weeks, and each man’s body weight was recorded. It is found that the mean change in body weight was +1.5 kg. The variance of these 20 data of weight-change has been estimated as s2 = 6.25 kg2. (50 pts) – t distribution and chi-square distribution tables are included. (a) Test the null hypothesis that the candy bar has NO significant effect on body weight. (b) Test the...
1. The mayor is interested in finding a 90% confidence interval for the mean number of...
1. The mayor is interested in finding a 90% confidence interval for the mean number of pounds of trash per person per week that is generated in the city. The study included 209 residents whose mean number of pounds of trash generated per person per week was 34.5 pounds and the standard deviation was 7.5 pounds. Round answers to 3 decimal places where possible a.With 90% confidence the population mean number of pounds per person per week is between ___...
1. What effect does raising the level of confidence have on the width of the confidence...
1. What effect does raising the level of confidence have on the width of the confidence interval? 2. What effect does lowering the the sample size have on the width of the confidence interval? 3. What effect does a smaller population standard deviation have on the width of the confidence interval? 4. Which of the following is the best interpretation for a 99% confidence interval? 5. Based on prior studies, you believe the standard deviation of IQ is normally distributed...
Test: Last Exam Ch8-Ch10Sp19 Time Remaining: 00:38 37 Submit Test This Test: 78 pts possible This...
Test: Last Exam Ch8-Ch10Sp19 Time Remaining: 00:38 37 Submit Test This Test: 78 pts possible This Question: 3 pts 4 of 22 (10 complete) Data on the numbers of hospital admissions resulting from motor vehicle crashes are given below for Fridays on the 6th of a month and Fridays on the following 13th of the same month. Assume that the paired sample data is a simple random sample and that the differences have a distribution that is approximately normal. Construct...
answer all questions and ill leave a like :) part 1 a) find the sample mean...
answer all questions and ill leave a like :)
part 1
a) find the sample mean
b) find the sample standard deviation
c) construct a 99% confidence interval for the population mean
u
part 2
just answer the second part
part 3
just answer the second part
part 4
part 5
part 6
find answers a-c
8 of 10 (0 complete) HW Score: 0%, 0 of 10 pts Score: 0 of 1 pt 6.2.26-T Question Help The grade point averages...
2. In estimating the mean number of television viewing hours per family per week, a random sample of 400 families yields a mean of 32.6 hours and a standard deviation of 9.9 hours (a) Find a 95% confidence interval for the average number of viewing hours per family per week in the population. Interpret. (b) Find a 99% confidence interval for the average number of viewing hours per family per week in the population. Interpret. (c) Suppose instead only 25...
5. For a random sample of 50 households with gas stoves monitored over a week, the sample mean CO2 level (ppm) in the households was -654.16, and the sample standard deviation was s 164.43. a. Check if the CLT (central limit theorem) applies and show the two assumptions that you check. b. Calculate a 95% (two-sided) confidence interval for true average CO2 level in the population of households with gas stoves. c. Interpret your CI from b. d. Suppose the...
Q12. a) Suppose the given confidence interval estimates the true population mean as 3.5 < u < 13.1 with a 95% level of confidence when o is known. (1) Find the point estimates for the unknown population mean. (ii) Find the margin of error. (iii) Give the interpretation of the confidence interval. (iv) Name two ways of decreasing the width of the confidence interval. b) State the assumptions necessary for linear regression model Y = A + Bx + E...
1. What effect does raising the level of confidence have on the width of the confidence interval? 2. What effect does lowering the the sample size have on the width of the confidence interval? 3. What effect does a smaller population standard deviation have on the width of the confidence interval? 4. Which of the following is the best interpretation for a 99% confidence interval? 5. Based on prior studies, you believe the standard deviation of IQ is normally distributed...
Test: Last Exam Ch8-Ch10Sp19 Time Remaining: 00:38 37 Submit Test This Test: 78 pts possible This Question: 3 pts 4 of 22 (10 complete) Data on the numbers of hospital admissions resulting from motor vehicle crashes are given below for Fridays on the 6th of a month and Fridays on the following 13th of the same month. Assume that the paired sample data is a simple random sample and that the differences have a distribution that is approximately normal. Construct...
answer all questions and ill leave a like :)
part 1
a) find the sample mean
b) find the sample standard deviation
c) construct a 99% confidence interval for the population mean
u
part 2
just answer the second part
part 3
just answer the second part
part 4
part 5
part 6
find answers a-c
8 of 10 (0 complete) HW Score: 0%, 0 of 10 pts Score: 0 of 1 pt 6.2.26-T Question Help The grade point averages...
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