Search & Filtering
For the reaction
3 H2(g) + N2(g) ----------> 2 NH3(g)
what mass of NH3(g) is produced when 2.15 L of H2(g) measured at STP reacts?
A nutrition store in the mall is selling “Memory Booster,” which is a concoction of herbs and minerals that is intended to improve memory performance, but there is no good reason to think it couldn't possibly do the opposite. To test the effectiveness of the herbal mix, a researcher obtains a sample of 8 participants and asks each person to take the suggested dosage each day for 4 weeks. At the end of the 4-week period, each individual takes a standardized memory test. In the general population, the standardized test is known to have a mean of μ = 7. (Set the significance level➔ = .05)
Find P( -1.2 < Z < -0.2 )
For the reaction
MnO2(gas) + 4 HCl(aq) ----------> MnCl2(aq) + Cl2(g) + 2 H2O(l)
1. what volume of Cl2(g) measured at STP is produced when 7.65 g of HCl(aq) reacts?
Given: Margin of error (d)= 2.19, Confidence interval (CI) of population mean = 90%, and population standard deviation (σ)= 5 solve for the appropriate sample size.
A firm produces two commodities, ×, and y. The demand functions are
P, = 900 - 2x - 2 y
and
P, = 1400 - 2x -4y
respectively, where P, is the price of commodity x and P, is the price of commodity y. The costs
are given by
C, = 7000 + 100x + x2
and
C, = 10000 + 6 y*
a) Show that the firm's profit function is given by
7 (x, y) = -3x? - 10y? 4xy + 800x +1400y -17000
b) Suppose the firm is required to produce a total of exactly 60 units. Find the values of x
and y that maximize profits.
In a study made on time and motion, it was found out that a certain manual work can be finished at an average time of 40 minutes with a standard deviation of 18 minutes. A group of 16 workers is given a special training and then found to average only 35 minutes. Can we conclude that the special training can speed up the work using a 0.05 level?
2. A random sample of 40 boys showed a mean weight of 120 lbs. with a standard deviation
of 12lbs. The standard weight for their age category is about 130lbs. Test the hypotheis that the selected boys are significantly lighter than the standard weight at0.01 level of siginificance.
Construct the sampling distribution of the sample mean for the population that consists of the scores 15, 18, 11, 14, 17, with a sample size of 3. Compute as well the mean of the sampling distribution using the expected value of the distribution and verify the result by computing for the population mean.
23.12 grams of glucose (C6H12O6) is dissolved in 1.00 kg of water. Calculate the molality
