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COMPARISON OF SPECIALTY AUXILIARY BACKUP LAB BATTERY LIFETIMES
A company that manufactures specialty batteries used as auxiliary back- ups for sensitive laboratory equipments in need of constant power sup- plies claims that its new prototype, brand A, has a longer lifetime (un- der constant use) than the industry-leading brand B, and at the same cost. Using accepted industry protocol, a series of tests carried out in an independent laboratory produced the following results: For brand A: sample size, n1 = 40; average lifetime, x¯1 = 647 hrs; with a population standard deviation given as σ1 = 27 hrs. The corresponding results for brand B are n2 = 40; x¯2 = 638; σ2 = 31. Determine, at the 5% level, if there is a signi?cant di?erence between the observed mean lifetimes.
For the chil- dren, x = 90 and s = 5; for the young adults, x = 82 and s = 11; and for the older people, x = 88 and s = 6. Give a 95% con?dence interval for the population average rating for the new chocolate.
They hope to use a sample size such that, with probability 0.95, the error will not exceed 0.04. What sample size will ensure this, regardless of what sample proportion value occurs when they gather the sample?
Here is a simple probability model for multiple-choice tests. Assume that each student has probability p of correctly answering the question chosen at random from universe of possible questions.
Are the findings statistically significant? Why or why not? Describe the process you used to make this determination and provide the level of significance.
Each stated characteristic is a sample estimate. The 95% confidence intervals are [0.07 to 0.09] for PD, [$160,000 to $200,000] for EAD, The expected loss becomes the interval
It is given that 60% of the employees at a large company are women. A simple random sample of 15 employees is selected from this company.
the probability that a small business will go bankrupt in its first year is 0.21. For 50 such small business, find the following probabilities by using either the binomial probability formula or by using the normal approximation.
question suppose you have an investment a whose return is normally distributed with mean 8 and standard deviation of
Problem: A manufacturer of biscuits produces 3 times as many cream ones as chocolate ones. Biscuits are chosen randomly and packed into boxes of 10. Find the probability that a box contains equal numbers of cream biscuits and chocolate biscuits.
Sample of newspaper readers was asked to report which newspaper they read and to point to whether they were blue-collar worker, white-collar workerNewspaper reader is selected at random. Determine the probability that person selected.
Compare the effectiveness of three methods of teaching (IV). You plan to administer a standardized test (DV measured on an interval scale measuring knowledge acquisition) to the students in three classes with each class using a different teaching ..
A study is being conducted to see if swearing can help reduce pain. Each participant is asking to plunge their hand in ice as long as the pain would allow. In one condition, the participant repeatedly yelled their favorite curse word. In the other..
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