average weekly earnings of bus drivers in a city are $1050 (that is μ) with a...
average weekly earnings of bus drivers in a city are $1050 (that is μ) with a standard deviation of $54 (that is σ). Assume that we select a random sample of 81 bus drivers.
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a. |
Assume the number of bus drivers in the city is large compared to the sample size. Compute the standard error of the mean. |
|
b. |
What is the probability that the sample mean will be greater than $1080? |
|
c. |
If the population of bus drivers consisted of 400 drivers, what would be the standard error of the mean? |
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average weekly earnings of bus drivers in a city are $1050 (that
is μ) with a...
PART 1 Let X represent the average age of people living in Sun City. Assume that...
PART 1 Let X represent the average age of people living in Sun City. Assume that X has a normal probability distribution with μ=72 years and σ=10 years. You intend to measure a random sample of n=51 people. What is the mean of the distribution of sample means? μ¯x= What is the standard deviation of the distribution of sample means (i.e., the standard error in estimating the mean)? (Report answer accurate to 2 decimal places.) σ¯x= PART 2 In a...
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25> Consider a variable known to be Normally distributed with unknown mean μ and known standard...
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An intervention program was implemented to improve the work conditions of city bus drivers. Heart rates...
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Answers only is fine! Find the critical value zc necessary to form a confidence interval at...
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99 and standard deviation σ A population whose distribution is unknown has mean μ and a sample of size 26 is drawn from this population, then 1, a. The mean oJ a b. The standard error ot c. The distribution of A population whose distribution is unknown has mean μ = 99 and standard deviation σ = 7 and a sample of size 26 is drawn from this population, then 1, a. b. c. The mean of X= The standard...
25> Consider a variable known to be Normally distributed with unknown mean μ and known standard deviation σ-10. (a) what would be the margin of error of a 95% confidence interval for the population mean based on a random sample size of 25? The multiplier for a z confidence interval with a 95% confidence level is the critical value z. 1.960. (Enter your answer rounded to three decimal places.) margin of error 25 (b) What would be the margin of...
7. Suppose that the average weekly earnings for employees in general automotive repair shops is $450, and that the standard deviation for the weekly earnings for such employees is SSO. A sample of 100 such employees is selected at random. a) Find the mean and standard deviation of the sampling distribution of the average weekly earnings in the sample. (b) Find probability that the mean of the sample is less than $445. (e) Find the probability that the mean of...
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