Student Full Name: Provide an appropriate answer for each of the mean confidence interval problems. 1) Construct a 94% confidence interval for the population mean, u. Assume the population has a normal distribution. A sample of 40 part-time workers had mean annual earnings of $3120 with a standard deviation of $677. Round to the nearest dollar. (Show work) Fn 2) In order to set rates, an insurance company is trying to estimate the number of sick days that full time workers at a local bank take per year. Based on earlier studies it is known that the standard deviation is 12.3 days per year. How large a sample must be selected if the company wants to be 95% confident that their estimate is within 3 days of the true mean? Provide an appropriate answer for each of the proportion confidence interval problems. 3) A of 500 non-fatal accidents showed that 122 involved uninsured drivers. Construct a 96% confidence survey interval for the proportion of fatal accidents that involved uninsured drivers. (Show work)
Student Full Name: Provide an appropriate answer for each of the mean confidence interval problems. 1) Construct a 94% confidence interval for the population mean, u. Assume the population has a normal distribution. A sample of 40 part-time workers had mean annual earnings of $3120 with a standard deviation of $677. Round to the nearest dollar. (Show work) Fn 2) In order to set rates, an insurance company is trying to estimate the number of sick days that full time workers at a local bank take per year. Based on earlier studies it is known that the standard deviation is 12.3 days per year. How large a sample must be selected if the company wants to be 95% confident that their estimate is within 3 days of the true mean? Provide an appropriate answer for each of the proportion confidence interval problems. 3) A of 500 non-fatal accidents showed that 122 involved uninsured drivers. Construct a 96% confidence survey interval for the proportion of fatal accidents that involved uninsured drivers. (Show work)
A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
Section: Chapter Questions
Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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Questions 1,2, and 3
Transcribed Image Text:Student Full Name:
Provide an appropriate answer for each of the mean confidence interval problems.
1) Construct a 94% confidence interval for the population mean, u. Assume the population has a normal distribution.
A sample of 40 part-time workers had mean annual earnings of $3120 with a standard deviation of $677. Round to
the nearest dollar. (Show work)
Fn
2) In order to set rates, an insurance company is trying to estimate the number of sick days that full time workers at a
local bank take per year. Based on earlier studies it is known that the standard deviation is 12.3 days per year.
How large a sample must be selected if the company wants to be 95% confident that their estimate is within 3 days
of the true mean?
Provide an appropriate answer for each of the proportion confidence interval problems.
3) A of 500 non-fatal accidents showed that 122 involved uninsured drivers. Construct a 96% confidence
survey
interval for the proportion of fatal accidents that involved uninsured drivers. (Show work)
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