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1. Choo Choo Paper Company produces papers of various thicknesses. A random sample of 49 cuts had a mean thickness of 30.3 mils with a sample standard deviation of 4 mils.
a) Develop a 99% confidence interval for the mean thickness of the population.
b) Develop a 90% confidence interval for the mean thickness of the population.
2. A random sample of 121 checking accounts at a bank showed an average daily balance of $280. The standard deviation of the population is known to be $66. Construct a 95% confidence interval estimates for the mean.
3. Using the mean, standard deviation and confidence level from the previous question, how large a sample size would you need to use to achieve a margin of error of 7 dollars?
Political polls typically sample randomly from the U.S population to investigate the percentage of voters who favor some candidate or issue. The number of people polled is usually on the order of 1000. Suppose that one such poll asks voters how they ..
A package contains 18 candy canes, 13 of which are cracked. If 4 are selected, find the probability of getting exactly four cracked candy canes.
A BusinessWeek/Harris survey asked senior executives at large corporations
Calculate the odds ratio of the fish being female in the cold environment compared to the fish in the warm environment. Interpret this ratio in the context of the question.
Using Data/Filter and Sort make a subset of the main data table for Symbol HPQ (Hewlett Packard) for the year 2000. Make a line chart of the closing prices for the year 2000 from Jan through Dec.
A randomized, controlled experiment investigated
Thoughts on the value of statistics in general
What is the expected total inventory holding and ordering cost per year and how many days should one order last on average?
Refer to "The Use of Electro-Acupuncture in Conjunction with Exercise for the Treatment of Chronic Low-Back Pain" by Yeung, Leung, and Chow. Examine the question the researchers were trying to answer and write an essay (500-750 words) that explains w..
A more general exponential reliability model may be defined by R(t)=a^(-bt) where a>1, b>0 and a and b are parameters to be determined. Find the hazard rate function, and show how this model is equivalent to R(t)=e^-(lambda*t).
Specialization topic is employee management
According to the most recent davenport student profile
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