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The drying time of a certain type of paint under specified test conditions is known to have mean value 75 minutes. Chemists have proposed a new additive designed to decrease average drying time. Because of the expense associated with the additive, evidence should strongly suggest an improvement in average drying time before the additive is adopted-i.e., only if the null hypothesis is rejected will the additive be declared successful and used.
a) Define the parameter of interest and state the relevant hypotheses.
b) For a sample of n = 35 randomly selected observations, x-bar= 72.6 and s = 9. Conduct a hypothesis test for the hypotheses that you stated in part a at (aplha) = 0.05.
c) If x-bar had been 70 minutes instead of 72.6 minutes (assume s = 9 still), would you reach the same conclusion that you did in part b above? Explain. (Support your explanation with statistical evidence.)
Now suppose 3 of his customers want the same ring, and they will go to another store if its already been sold. Would it be appropriate to use the binomial distribution under these conditions? Why or why not?
in the biomedical engineering field a study of coronary artery disease had three possible partitioning events b1 the
A random sample of 25 injections resulted in a variance of 0.135 test if the apparatus has a greater variance than the desired one.
Which is the probability that the median of the sample is between $17 and $20?
Test of product quality using human inspectors can lead to serious inspection error problems. To evaluate the performance of inspectors in a new company, a quality manager had a sample of 12 novice inspectors evaluate 200 finished products.
He surveys several businesses and finds the standard deviation in monthly advertising costs is $23 for 12 hair salons, and $43 for 8 nail salons.
Additionally, method of delivery of drug (patch,pill, or nasal mist) was considered. In experiment, there were how many treatments?
A standard deck of playing cards contains 52 cards divided equally into four suits: Spades, Hearts, Diamonds, and Clubs. Each suit contains thirteen cards: 2, 3, 4, 5, 6, 7, 8, 9, 10, J(ack), Q(ueen), K(ing), A(ce).
the cost of a one-carat vs2 clarity h color diamond from diamond source usa is 5600 diamond source website march 2003.
In a raffle, 1,000 tickets are sold for $2 each. One ticket will be randomly selected and the winner will receive a laptop computer valued at $1200. What is the expected value if a person buys one ticket?
What is the dependent variable? is the dependent variable and determine the correlation coefficient. Coefficient of correlation
Percentage points in either direction from what would have been obtained by interviewing all voters in the United States." Find the sample size suggested by this statement.
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