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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?
suppose certain coins have weights that are normally distributed with a mean od 5.492 g and a standard deviation of
If the card selection is without replacement, what is the probability that the first card is an ace and the second card is also an ace? (Express the answer in simplest fraction form)
compute the standard error of the estimate for the data below.x values 56 68 78 85 98y values 87 110 138 161
Create a scatter diagram and consider the correlation for the given data. Create a scatter diagram and sketch the line you think best fits the data.
My question bout How do I use the TINV function within excel to back out the t-statistic for the test? Why did you use the TDIST function? I know ho to use the TINV function, but what does it mean to back out the t-statistic for the test?
a shipment of 100 cereal boxes is delivered to a grocery shop. the manager is told that the weights of cereal boxes are
What id Steve's grade point average at graduation and what is Steve's median grade point at graduation
Determine the average amount of time that a guest spends checking in. How would this change under each of the state options?
A study of 35 professors showed that the average time they spent creating test questions was 13.5 minutes per question. The standard deviation of the population is 3.8. Which of the following is the 99% confidence interval for the average number o..
Find out the decision strategy company must follow, expected value of strategy, and maximum amount the company must pay market research firm for survey results.
For each mutual fund, find an interval in which you would expect 95.44 percent of all yearly returns to fall. Assume returns are normally distributed.
A political science professor is interested in finding out whether there is a relation between political affiliation and attitude towards a recent supreme court ruling about challenges to federal affirmative-action programs.
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