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by: Nabila Reza

61

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10

# IE 330 IE 330

Nabila Reza
Purdue
GPA 3.2

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Exam 1 study guide
COURSE
Probability And Statistics In Engineering II
PROF.
Roshan Nateghi
TYPE
Study Guide
PAGES
10
WORDS
CONCEPTS
IE
KARMA
50 ?

## Popular in Industrial Engineering

This 10 page Study Guide was uploaded by Nabila Reza on Monday February 22, 2016. The Study Guide belongs to IE 330 at 1 MDSS-SGSLM-Langley AFB Advanced Education in General Dentistry 12 Months taught by Roshan Nateghi in Spring 2016. Since its upload, it has received 61 views. For similar materials see Probability And Statistics In Engineering II in Industrial Engineering at 1 MDSS-SGSLM-Langley AFB Advanced Education in General Dentistry 12 Months.

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Date Created: 02/22/16
IE 330 Test 1: Practice Questions Confidence intervals ▯A95 % confidence interval does not mean that there is a 95 % probability that the interval contains the true mean. The interval computed from a given sample either contains the true mean or it does not. Instead, the level of confidence is associated with the method of calculating the interval. The confidence coefficient is simply the proportion of samples of a given size that may be expected to contain the true mean. That is, for a 95 % confidence interval, if many samples are collected and the confidence interval computed, in the long run about 95 % of http://www.itl.nist.gov/div898/handbook/eda/section3/eda352.htm Practice Question 1 A cigarette manufacturer claims that the average nicotine content of brand B cigarette is 1.5 mg. Suppose the distribution of nicotine content is known to be normal with σ =0.3. Consider unhappy customers complaining about low nicotine content. They analyze a random sample of 36 cigarettes that yields an average of 1.4 mg. Based on their gathered data, can they lodge a complaint? (5% confidence level) Practice Question 2 A manufacturer of a sprinkler systems used for fire protection in the office buildings claims that the true average system activation temperature is 130 degrees. A sample from nine systems, when tested, yields a sample average activation temperature of 131.08 degrees. If the distribution of activation times is normal with standard deviation 1.5 degrees, does the data co▯tradict the ▯a▯ufacturer’s clai▯ at sig▯ifica▯ce le▯el of 0.01? Practice Question 3 A well-designed and safe work place can contribute greatly to increased productivity. It is especially important that workers not be asked to perform tasks, such as lifting, that exceeds their capabilities. The accompanying data on maximum weight of lift (MAWL, in kg) for a frequency of four lifts/min was reported in a journal article. Subjects were randomly selected from a the population of healthy males age 18-30. Assuming that MAWL is normally distributed, does the following data suggest that the population MAWL exceeds 25? {25.8, 36.6, 26.3, 21.8, 27.2} Practice Question 4 Many customers are turning to generics as a way of reducing the cost of prescription medications. A medical article gives the result of survey of 102 doctors. Only 47 of those surveyed knew the generic name for the drug Advil. Does this provide strong evidence for concluding that fewer than half of all physicians know the generic name for Advil? Practice Question 5 results. There are 38 slots in the wheel with 2 green slots, 18 redir slots, 18 black slots. It should therefore land on red 18/38 times (p=0.47). You want to test whether the proportion of times landing on red is=0.47. a) Minimum number of observations needed ? b) Hypothesis tests? c) You watch players play for sometime and count whether or not the ball lands on 50 different spins on the wheel. Yu count 30 times landing on red. Roughly estimate the test statistics. P value??

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