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Question 2. [3+4=7 Marks) Historical data indicates that the population standard deviation...
Colors Fonts Set as Default Document Formatting Answer the following questions: Question 1. [3+5=8 Marks] Rando...
Colors Fonts Set as Default Document Formatting Answer the following questions: Question 1. [3+5=8 Marks] Random samples have been selected from two normally distributed populations with equal variances. The following sample data were observed, Samples from population 1 Samples from population 2 a) Find a 90% confidence interval for the difference between two population means. b) Use a significance level of 0.10 for testing the hypothesis 11 HH2 10. (United States) Question 2. [3+4-7 Marks) Historical data indicates that the...
A simple random sample of size 39 has mean 3.64. The population standard deviation is 1.55....
A simple random sample of size 39 has mean 3.64. The population standard deviation is 1.55. Construct a 95% confidence interval for the population mean. 1.The parameter is the population (choose one) mean, proportion, standard deviation, variance 2. The correct method to find the confidence interval is (choose one) z, t, chi square method
answer neatly and correctly please! According to the historical data, the life expectancy in Belgium is...
answer neatly and correctly
please!
According to the historical data, the life expectancy in Belgium is less than the life expectancy in the United States. A new study has been made to see whether this has changed. Records of 220 individuals from Belgium who died recently are selected at random. The 220 individuals lived a mean of 78.3 years with a standard deviation of 7.1 years. Records of 225 individuals from the United States who died recently are selected at...
Confidence Interval about a Population Standard Deviation 3) Consider the same information as in Example 2...
Confidence Interval about a Population Standard Deviation 3) Consider the same information as in Example 2 on page 336, section 7.3, but use a confidence level of 90% instead of 95% Write your solution just like in the example. Show all work and use the formulas (do not use any technology here!) Note that the solution shown in the example is quite detailed. Your solution could be shorter, start where it says Using Table A-4 on page 337, and continue...
Question 2 1251 NICTUS furniture claims that the standard deviation in their delivery time is less...
Question 2 1251 NICTUS furniture claims that the standard deviation in their delivery time is less than 5 days. A sample of 30 past customers is taken. The average delivery time in the sample was 15 days with a sample standard deviation 5 days a. b. c. d Construct a 95% confidence interval for the population variance Construct a 90% confidence interval for the population standard deviation. State the null and alternative hypotheses to be tested. Test the company's claim...
(4)Five hundred students from a local high school took a college entrance examination. Historical data from the school record show that the standard deviation of test scores is 40. A random sampl...
(4)Five hundred students from a local high school took a college entrance examination. Historical data from the school record show that the standard deviation of test scores is 40. A random sample of thirty- six students is taken from the entire population of 500 students. The mean test score for the sample is three hundred eighty. Find (a) 95% confidence interval for the unknown population mean test score. (b) 95% confidence interval for the unknown population mean test score if...
3. An IQ test is designed so that the mean is 100 and the standard deviation is 19 for the population of adults. Find t...
3. An IQ test is designed so that the mean is 100 and the standard deviation is 19 for the population of adults. Find the sample size necessary to estimate the mean IQ score of nurses such that it can be said with 99 % confidence that the sample mean is within 5 IQ points of the true mean. Assume that o = 19 and determine the required sample size using technology. The required sample size is _ (Round up...
3. Consider a normally distributed population with a standard deviation of 36. If a random sample...
3. Consider a normally distributed population with a standard deviation of 36. If a random sample of size 49 produces a sample mean of 150, construct an 80% confidence interval for the true mean of the population.
Where B = 2 Question 7 (10 marks) (a) A population of size 20 is sampled...
Where B = 2
Question 7 (10 marks) (a) A population of size 20 is sampled without replacement. The standard deviation of the population is 0.35. Find the minimum sample size that the standard error of the mean is no more than 0.15. (5 marks) (b) A sample of 30 masks was taken randomly from the production line. Assume the strengths of the marks follow a normal distribution. The strength of each specimen was determined, giving a sample standard deviation...
Keep in mind it says population standard deviation is 11.9 so it should be a Standard...
Keep in mind it says population standard deviation is
11.9 so it should be a Standard normal using Z tables and not
T?
2. The Edison Electric Institute has published figures on the number of kilowatt hours used annually by various home appliances. It is claimed that a vacuum cleaner uses an average of 46 kilowatt hours per year. A random sample of 12 homes included in a planned study indicates that vacuum cleaners use an average of 42 kilowatt...
Colors Fonts Set as Default Document Formatting Answer the following questions: Question 1. [3+5=8 Marks] Random samples have been selected from two normally distributed populations with equal variances. The following sample data were observed, Samples from population 1 Samples from population 2 a) Find a 90% confidence interval for the difference between two population means. b) Use a significance level of 0.10 for testing the hypothesis 11 HH2 10. (United States) Question 2. [3+4-7 Marks) Historical data indicates that the...
answer neatly and correctly
please!
According to the historical data, the life expectancy in Belgium is less than the life expectancy in the United States. A new study has been made to see whether this has changed. Records of 220 individuals from Belgium who died recently are selected at random. The 220 individuals lived a mean of 78.3 years with a standard deviation of 7.1 years. Records of 225 individuals from the United States who died recently are selected at...
Confidence Interval about a Population Standard Deviation 3) Consider the same information as in Example 2 on page 336, section 7.3, but use a confidence level of 90% instead of 95% Write your solution just like in the example. Show all work and use the formulas (do not use any technology here!) Note that the solution shown in the example is quite detailed. Your solution could be shorter, start where it says Using Table A-4 on page 337, and continue...
Question 2 1251 NICTUS furniture claims that the standard deviation in their delivery time is less than 5 days. A sample of 30 past customers is taken. The average delivery time in the sample was 15 days with a sample standard deviation 5 days a. b. c. d Construct a 95% confidence interval for the population variance Construct a 90% confidence interval for the population standard deviation. State the null and alternative hypotheses to be tested. Test the company's claim...
(4)Five hundred students from a local high school took a college entrance examination. Historical data from the school record show that the standard deviation of test scores is 40. A random sample of thirty- six students is taken from the entire population of 500 students. The mean test score for the sample is three hundred eighty. Find (a) 95% confidence interval for the unknown population mean test score. (b) 95% confidence interval for the unknown population mean test score if...
3. An IQ test is designed so that the mean is 100 and the standard deviation is 19 for the population of adults. Find the sample size necessary to estimate the mean IQ score of nurses such that it can be said with 99 % confidence that the sample mean is within 5 IQ points of the true mean. Assume that o = 19 and determine the required sample size using technology. The required sample size is _ (Round up...
3. Consider a normally distributed population with a standard deviation of 36. If a random sample of size 49 produces a sample mean of 150, construct an 80% confidence interval for the true mean of the population.
Where B = 2
Question 7 (10 marks) (a) A population of size 20 is sampled without replacement. The standard deviation of the population is 0.35. Find the minimum sample size that the standard error of the mean is no more than 0.15. (5 marks) (b) A sample of 30 masks was taken randomly from the production line. Assume the strengths of the marks follow a normal distribution. The strength of each specimen was determined, giving a sample standard deviation...
Keep in mind it says population standard deviation is
11.9 so it should be a Standard normal using Z tables and not
T?
2. The Edison Electric Institute has published figures on the number of kilowatt hours used annually by various home appliances. It is claimed that a vacuum cleaner uses an average of 46 kilowatt hours per year. A random sample of 12 homes included in a planned study indicates that vacuum cleaners use an average of 42 kilowatt...
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