Will someone please help me with these statistics word problems? - what type of engineers would be involved in cars
A company wants to estimate the average annual real income of the customer. It randomly samples 200 of its customers. The average annual income of $ 55,200 was a standard deviation of $ 1,500. Find a confidence interval 95% to the average real income of the annual "the company's customers.
A company wants to estimate the average annual real income of the customer. The company must be at least $ 200 for half the truth. The Company believes that the true population standard deviation is about $ 1300th If the 95% confidence of finding the sample size necessary to achieve the desired accuracy.
An engineer in the automobile safety is an estimate of the average cost to repair a Chevy Corvette involved in a collision 30 mph, the engineer of 18 accidents Corvettes and find the damage to $ 17,500 with a standard deviation of $ 2400th Find a confidence interval of 95% with the actual average cost for such a car repair.
A listener wants, what percentage of cases of bank loan estimate is incomplete. The listener is within 7%the true proportion when using a 95%. How many files it is necessary that the auditor of the test? There are no estimates on the share is available, then use 0.5 for the proportion of the population.
Thursday, January 28, 2010
What Type Of Engineers Would Be Involved In Cars Will Someone Please Help Me With These Statistics Word Problems?
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2 comments:
A) The confidence interval is replaced by one:
Xbar ± Zα / 2 (σ / √ n)
Assessment,
55,200 ± 1.96 (1500 / √ 200), and the beach is:
54,992.11 \\ \\ \\ \\ \\ \\ \\ \\ u0026lt; μ \\ \\ \\ \\ \\ \\ \\ \\ u0026lt; 55,407.89
N B) = [1.96 ∙ 1300/200] ² ≈ 163
C) to do around this, as a (A).
D) has used a different ID (B), because it proportions.
n = [Zα/2/E] ² (p (1-p)) = [1.96/0.07] ² (0.50) (.0.50)
= 196 exactly
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