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An engineer in charge of a production process that produces a stain for outdoor decks has designed a study to test the research hypotheses that an additive to the stain will produce an increase in the ability of the stain to resist water absorption. The mean absorption rate of the stain without the additive is µ = 40 units. The engineer places the stain with the additive on n = 50 pieces of decking material and records y = 36.5 and s = 13.1. Determine the level of significance for testing Ha: µ = 40. Is there significant evidence in the data to support the contention that the additive has decreased the mean absorption rate of the stain using an a =.05 test?
Find a 95% confidence interval for the difference between this year and last year in the mean number of units sold at all retail stores and interpret the results.
1.an experiment was conducted to determine the effects of three different pesticides p1p2p3 on the yield of three
over the years grades in an introductory statistics course were recorded and showed the following proportionsa 0.20 b
An "Ogive" of the cumulative frequency distribution2. Estimate the Mean, Median, Range, Standard Deviation and Coefficient of Variation of the returns of each of the three funds.3.
Assume that the measurements came from a normal distribution. The variability of the manufacturing process is unknown means the same as the standard deviation is unknown.
suppose that n items are sampled from a manufacturing process and the number of de- fective items found among these is
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a study of college students show that 8 out of 12 students prefer a pc while 4 prefer mac. randomly select 2 students
customers arrive at a checkout counter following a poisson process with rate 12per hr.a compute the probability of
If a filled container of juice is selected at random, what is the probability that it was filled on machine I and is a conforming container?
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