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Q11. A sample of 20 taken from the 500 employees of Target Insurance Company produced a...
A sample of 49 observations is taken from a normal population with a standard deviation of 10. The sample mean is 55.
A sample of 49 observations is taken from a normal population with a standard deviation of 10. The sample mean is 55. Determine the 99% confidence interval for the population mean. (Round your answers to 2 decimal places.) Confidence interval for the population mean is _______ and _______ .A research firm conducted a survey to determine the mean amount Americans spend on coffee during a week. They found the distribution of weekly spending followed the normal distribution with a population standard deviation...
2. (20 points) A random sample of 16 senior employees at a large company yielded a...
2. (20 points) A random sample of 16 senior employees at a large company yielded a sample mean annual salary of $109,450 with a sample standard deviation of $9,400. Determine a 95 percent confidence interval of the average salary of all senior employees at that company
A) Sample of size 15 is taken from among a population of egrets and used to...
A) Sample of size 15 is taken from among a population of egrets and used to calculate a 99% confidence interval for the true average wingspan in the population. Suppose the sample standard deviation is calculated to be s =6.2. What is the margin of error for the confidence interval? Round your answer to 3 decimal places. B) Suppose you are asked to construct a 99% confidence interval for an unknown population mean μ. The population standard deviation is unknown...
The average time taken by a sample of 68 runners to complete a 10km race was...
The average time taken by a sample of 68 runners to complete a 10km race was 42 minutes. Assuming a population standard deviation of 8.65 minutes, construct a 99% confidence interval for the true average time taken by all runners to complete the race. Interpret your answer. (6) Confidence Level Z - Limits 90% ± 1.645 95% ±1.96 99% ±2.58
QUESTION 6 A sample was taken of the salaries of 20 employees of a large company....
QUESTION 6 A sample was taken of the salaries of 20 employees of a large company. The following s a boxplot of the salanes (ün thousands of dollars) Reference Ret 1-10 Based on this boxplot, which of the following statements is true? A. About 10 employees make over S 50,000. O B. All of the answers are correct. O c. The salary distribution is fairly symmetric. O D.Nobody makes over $80,000.
Kroger indicates the average salary per hour of their employees is $9 per hour. A sample...
Kroger indicates the average salary per hour of their employees is $9 per hour. A sample of 13 Kroger employees revealed a mean of $11 per hour with a standard deviation of $3 per hour. Costco indicates the average salary per hour of their employees is $10 per hour. A sample of 15 Costco employees revealed a mean of $9.50 per hour with a standard deviation of $2 per hour. At the .05 significance level, can we conclude there is...
A sample was taken of the salaries of 20 employees from a large company. The following...
A sample was taken of the salaries of 20 employees from a large company. The following are the salaries (in thousands of dollars) for this year (the data are ordered): 28, 31, 34, 35, 37, 41, 42, 42, 42, 47, 49, 51, 52, 52, 60, 61, 67, 72, 75, 77. Suppose each employee in the company receives a $3000 raise for next year (each employees salary is increased by $3000). The interquartile range of the salaries will A) increase by...
a) A random sample of 15 employees of airtel call Centre was taken and each employee...
a) A random sample of 15 employees of airtel call Centre was taken and each employee took a competency test. The mean of the scores achieved by these employees was 56.3 with a standard deviation of 7.1. Results of this test have been found to be normally distributed in the past. Construct a 95% confidence interval for the mean test score of all the employees of the call Centre. [6 marks] b) Find a 95% confidence interval estimating the mean...
4. In a survey conducted to determine, among other things, the cost of vacations taken by...
4. In a survey conducted to determine, among other things, the cost of vacations taken by single adults in a particular region, 144 individuals were randomly sampled. Each person was asked to assess the total cost of her or his most recent vacation. The average cost was $2386 and the standard deviation was $400. (a) (2) Estimate with a 99% confidence interval the average cost of a trip for all single adults in the region (b) [2] How large a...
A random sample of 49 lunch customers was taken at a restaurant. The average amount of...
A random sample of 49 lunch customers was taken at a restaurant. The average amount of time the customers in the sample stayed in the restaurant was 45 minutes with a standard deviation of 14 minutes. a. Compute the standard error of the mean. b. Construct a 99% confidence interval for the true average amount of time customers spent in the restaurant. c. With a .99 probability, how large of a sample would have to be taken to provide a...
2. (20 points) A random sample of 16 senior employees at a large company yielded a sample mean annual salary of $109,450 with a sample standard deviation of $9,400. Determine a 95 percent confidence interval of the average salary of all senior employees at that company
QUESTION 6 A sample was taken of the salaries of 20 employees of a large company. The following s a boxplot of the salanes (ün thousands of dollars) Reference Ret 1-10 Based on this boxplot, which of the following statements is true? A. About 10 employees make over S 50,000. O B. All of the answers are correct. O c. The salary distribution is fairly symmetric. O D.Nobody makes over $80,000.
a) A random sample of 15 employees of airtel call Centre was taken and each employee took a competency test. The mean of the scores achieved by these employees was 56.3 with a standard deviation of 7.1. Results of this test have been found to be normally distributed in the past. Construct a 95% confidence interval for the mean test score of all the employees of the call Centre. [6 marks] b) Find a 95% confidence interval estimating the mean...
4. In a survey conducted to determine, among other things, the cost of vacations taken by single adults in a particular region, 144 individuals were randomly sampled. Each person was asked to assess the total cost of her or his most recent vacation. The average cost was $2386 and the standard deviation was $400. (a) (2) Estimate with a 99% confidence interval the average cost of a trip for all single adults in the region (b) [2] How large a...
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