Allegany College of Maryland
(1 point) In the study of red/green color blindness, 750 men and 2750 women are randomly selected and tested. Among the men, 64 have red/green color blindness. Among the women, 6 have red/green color blindness. Test the claim that men have a higher rate of red/green color blindness.
(a) State the null hypothesis:
(b) State the alternative hypothesis:
(c) The test statistic is
(d) Is there sufficient evidence to support the claim that men have a higher rate of red/green color blindness than women? Use a 1% significance level.
(e) Construct the 99% confidence interval for the difference between the color blindness rates of men and women.
(1 point) Suppose a group of 900 smokers (who all wanted to give up smoking) were randomly assigned to receive an antidepressant drug or a placebo for 6 weeks. Of the 513 patients who received the antidepressant drug, 110 were not smoking one year later. Of the 387 patients who received the placebo, 101 were not smoking one year later. Given the null : and the alternative hypothesis: ≠ 0 , conduct to see if taking an antidepressant drug can help smokers stop smoking. Use, α= 0.05
(a) The test statistic is
(b) The P-value is
(c) The final conclusion is
◯ A. There seems to be evidence that the patients taking the antidepressant drug have a different success rate of not smoking after one year than the placebo group
◯ B. There is not sufficient evidence to determine whether the antidepressant drug has an effect on changing smoking habits after one year.
10 ml of commercial vinegar solution was added to 100ml volumetric flask distilled water was added till the line mark. 5 ml of the dilute vinegar was titrated against standardized NaOH solution of molar concentration 0.25M. The end point was reached after the addition of 3.32 ml NaOH solution. The concentration of acetic acid in commercial vinegar solution is:
30.0 g of an aluminum mineral is reacted with enough HCl to produce the corresponding chloride and 5,548 L of hydrogen gas (coming exclusively from the reaction of aluminum). If the reaction was carried out at 30 ° C and at a pressure of 1.12 atm.
Calculate the % composition of the aluminum in the mineral sample.
A gas cylinder A has a volume of 48.2 L and contains N2 (g) at 8.35 atm and 25 ° C. Gas cylinder B, the volume of which is unknown, contains He (g) at 9.50 atm and 25 ° C. When the two cylinders are connected and the gases are mixed, the pressure in both cylinders is 8.71 atm.
What is the volume, in liters, of bottle B?
Norder to verify the heat of reaction a chemist mix is 1 L of one more NAOHM1 liter of one more HCl the initial temperature of the two solutions is 25°C specific heat of water is 4.184 J Program Celsius the enthalpy of reaction of the following is -58 kJ per mole considering on with the specific heat of the 2 L of water and no heat transfer to or from the surroundings what is the final temperature of the solution￼
The cylinder-piston device holds 0.2 m of air at a pressure of 200 kPa, at which condition a linear spring touches the piston. But without force acting on the piston as shown in the following figure, the air is heated until the volume and pressure change to 0.5 m and 800 kPa, respectively. Find (a) the total work performed by the air; (b) the work performed against the spring. (c) Draw a Pu diagram showing the process. (Answer (a) 150 KJ (b) 90 kJ).
Element A has two isotopes. The first isotope is present 13.00% of the time and has a mass of 240.39. The second isotope has a mass of 189.67. Calculate the atomic mass of element A.
⭕ The atomic mass cannot be calculated without more information.
What is the shape of ?
⭕ trigonal pyramidal
⭕ trigonal planar
What is the angle of ?
Assume that you are working with an Antacid tablet that contains 550mg CaCO3 and 110mg Mg(OH)2. Each tablet weighs 745mg.
Part A step 1. Determine the amount of tablet powder that would need to be weighed to give you 1000mg of CaCO3.
Part A Step 3. How much CaCO3 is in the 20 ml portion?
Part A Step 4. How much EDTA is needed for one titration? Given that each mL of EDTA is equivalent to 5.004 mg of CaCO3.
If the tablets (tablet powder) actually contain both CaCO3 and Mg(OH)2 â How much Mg(OH)2 was weighed in Part A Step 1 along with the CaCO3.
Part B Step1: In each ml of filtrate, how much (mg) of each, CaCO3 and Mg(OH)2, exist?
So how much filtrate would be equal to 120mg of CaCO3 and Mg(OH)2?
Part B Step 3: How much EDTA is needed for one titration? (Remember for the Ca present: each mL of EDTA is equivalent to 5.004 mg of CaCO3 and for the Mg present: each mL of EDTA is equivalent to 2.916 mg of Mg(OH)2.)