Multi-stage flash distillation is used to desalinate seawater so it is fit for human consumption. A flash distillation tank is composed of small chambers (called "stages"), each at a lower pressure than the previous stage. Salt water enters the first chamber, some fresh water flash evaporates, condenses, and is removed from the distillation tank. The remaining salt water moves to the next chamber, some fresh water flash evaporates, condenses, and is removed from the distillation tank. The remaining salt water moves to the next chamber, and the process repeats until very salty water is expelled as waste. Brine that is 35,000 ppm salt is desalinated through a 5-stage flash distillation process. The pressure in the stages is such that 8% by mass of the water entering the stage evaporates and leaves as fresh water. If the desalination plant wants to produce 2800.0 gallons of drinking water per day, how many gallons of brine must the plant take in per day? The density of fresh water is 1.000 g/cm3. The density of brine is 1.025 g/cm3. a. What mass of waste brine is expelled in one day?

Dogs can be trained to detect diseases in humans by sniffing certain human secretions. In 54 trials, a sniffer dog was presented with 7 vials of secretions (6 from healthy individuals, 1 from a person with a disease). In 14 out of the 54 trials, the sniffer dog correctly identified the vial from the person with the disease. The test is judged to be useless if the dogs are essentially guessing, but there is some hope for improvement if the dogs react in some way that suggests that they are not guessing.

10) [6 marks] The population consists of all possible trials of this kind that this dog could be submitted to. What would be the parameter and random variable associated with each trial?

11) [6 marks] State the hypotheses for the trial that could be used to see if there was evidence that the dog was not guessing.

12) [10 marks] If the null hypothesis is true, then find the p-value for this test. You will need to use one of the following probabilities to do this: P[6 or more correct identifications] = 0.802 P[6 or fewer correct identifications] = 0.332 P[14 or more correct identifications] = 0.0173 P[14 or fewer correct identifications] = 0.9827

13) [5 marks] At a level of 0.1, is there evidence that the null hypothesis should be rejected? Explain, briefly. [Note: if you were unable to get a value from the previous question, assume that the p-value was 0.145].

14) [25 marks] State the meaning of the value 0.1 used as a significance level in this test, in the context of this question. I have a midterm monday, SOS

How do I do this in JMP? Anova

The human resources​ (HR) office is concerned that​ health-care costs differ among several​ departments: administration,​ clerical, manufacturing, information technology​ (IT), and sales. Staff selected a sample of 15 employees of each type and found health care costs for each. Complete parts​ (a) through​ (f). Assume alpha =0.1

Benzene is a known human carcinogen. The boiling point of benzene is 80. °C (reference 1).

a) Research online to find the short term exposure limit (STEL) for benzene. What does the STEL mean?

b) A friend is planning to do an experiment with liquid benzene at 21 °C on the open bench top in a small   (18 m3 ) poorly ventilated room (i.e. consider the room to be a closed system for this question). Convert the STEL to vapour pressure for this room.

c) Calculate the theoretical vapour pressure of benzene inside the room at 21 °C. Use your data to explain to your friend why he can or cannot do the experiment.

d) Fully explain why the following equation (derived from the ideal gas law) cannot be used to calculate the vapour pressure/temperature data at another temperature/pressure. P1/T1 = P2/T2

Thanks!

A Deloitte employment survey asked a sample of human resource executives how their company planned to change its workforce over the next 12 months. A categorical response variable showed three options: the company plans to hire and add to the number of employees, the company plans no change in the number of employees, or the company plans to lay off and reduce the number of employees. Another categorical variable indicated if the company was private or public. Sample data for 180 companies are summarized as follows.

Find the value of the test statistic. (Round your answer to three decimal places.)

Find the p-value. (Round your answer to four decimal places.)

p-value =

One field of economics, referred to as human capital, has often held that a person’s income (I) could be determined on the basis of his or her (1) education level (E), (2) training (T), and (3) the person’s general level of health (H). Using 25 employees at a small textile firm in North Carolina, a researcher regressed income on the other three variables and got the following results.

I = 27.2 + 3.7 E + 1.7 T + 3.05 H

(3.70) (6.21) (4.32) (6.79)

with r-squared = 0.67 and the calculated F statistic equal to 5.97. Beneath each coefficient is the calculated t statistic.

I is measured in units of $1000, E and T are measured in years, and H is measured in terms of a scaled index of one’s health: the higher the index, the better the level of health.

a. If one’s education increases by two years, what happens to his or her income?

b. Is the model significant at the 5% level? Show all parts of any test.

c. Determine which variable(s) is (are) significant at the 10 percent level. Show all parts of any test.

d. What is the value of the adjusted coefficient of determination?

Students are to complete Module 4, Human Resources and Capacity (Scenario) in Practice Operations. Based on their observations in this scenario, and upon a careful review of the available literature, the student is to consider him - or herself to be the Production Manager of Kibby and Strand, the company in the scenario.

The CEO is thinking of expanding Kibby and Strand, and you are tasked to create a data collection plan and measurement criteria for how production output and product quality will be measured. Create your collection plan and output measurement criteria assuming the current production capacity in the simulation scenario will be doubled.

In addition, the HR manager asks for a list of qualifications and skill sets required for production shift managers to staff the expansion. Create your job ad to include qualifications and desired skill sets.

The student is to create the data collection plan, measurement criteria, job qualifications list, and staffing plan based on knowledge learned in the scenario, and post it in the discussion

2. Adapted from Exercise 3.19 in the textbook. The length of human pregnancies from conception to birth varies according to a distribution that is approximately normal with mean 266 days and standard deviation 16 days.

(a) Between what range of days do about 95% of pregnancies last?

(b) What proportion of pregnancies last more than 170 days?

(c) What proportion of pregnancies last less than 245 days? 1

(d) What proportion of pregnancies last between 245 and 280 days?

(e) A pregnancy that lasts an amount of time 0.3 standard deviations less than the means lasted for how many days?

Lester Hollar is vice president for human resources for a large manufacturing company. In recent years, he has noticed an increase in absenteeism, which he thinks is related to the general health of the employees. Four years ago, in an attempt to improve the situation, he began a fitness program in which employees exercise during their lunch hour. To evaluate the program, he selected a random sample of eight participants and found the number of days each was absent in the six months before the exercise program began and in the last six months. Below are the results.

At the .05 significance level, can he conclude that the number of absences has declined? Estimate the p-value.

a. State the decision rule for 0.1 significance level: H₀ : μ_d≤ 0; H₁ : μ_d > 0. (Round the final answer to 3 decimal places.)

Reject H₀ if t > _________

b. Compute the value of the test statistic. (Round the final answer to 3 decimal places.)

Value of the test statistic: ____________

c. Estimate the p-value? (Round the final answer to 4 decimal places.)

p-value: ____________-

d. What is your decision regarding H₀?

At the 0.05 significance level,  (reject or do not reject?)  H₀.

Length (in days) of human pregnancies is a normal random variable (X) with mean 266, standard deviation 16.

(It would be useful to sketch this normal distribution yourself, marking its mean and the values that are 1, 2, and 3 standard deviations below and above the mean. Click to compare your figure to ours)

The probability is 0.95 that a pregnancy will last between ?218234250266282298 and ?218234250266282298 days.

The shortest 16% of pregnancies last less than ?218,234,250,266,282,298 days.

The probability of a pregnancy lasting longer than 314 days is Select an answer0.00150.0250.160.680.950.997 .

There is a probability of 0.5 that a pregnancy will last longer than ?218,234,250,266,282,298 days.