12:49 Wed, 8 May ☑ < W7_Practice calculations_worked solutions_Q13-21 Question 14 ☑ ៣៣ *86% Q : You have a stock solution of the antibiotic drug amoxicillin with a concentration of 1 mg/mL. In an experiment to determine the Minimal Inhibitory Concentration (MIC) of amoxicillin, you need to make 20 mL solutions with the following concentrations: 100 mcg/mL, 50 mcg/mL, 25 mcg/mL and 10 mcg/mL. The sterile diluent used for dilution is very expensive, how would you go about making these solutions?
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- The average concentration of ozone in unpolluted tropospheric air is 50 ppbV (that is, fifty molecules of ozone per billion molecules of air). You are trying to determine whether pollution has elevated average tropospheric ozone concentrations above the 50 ppbV “background” level at a particular location. You take five concentration measurements and obtain values of 30, 74, 48, 90, and 85 ppb. Based on other studies of ozone in the troposphere, you assume that these measurements were obtained from a normal distribution. Note in this instance, the null hypothesis should be set up similar to the way I set things up in the lecture for the DeSpoille and Pillage example. (a) What are the mean, standard deviation, and standard error of the mean of measured ozone concentrations? (b) In testing whether the average concentration is elevated above the “background”, what should be yournull hypothesis? Should you use a one- or two-tailed test? (c) Can you reject the null hypothesis at a…8:58 0: 2.10 MB/S ul 86% 03_Seatwork_3.. STI GE1707 Name: Section: Score: Date: Direction: Use Polya's four-step problem-solving strategy to solve the following problems. (8 items x 2 points) 1. If six (6) people greet each other at a meeting by shaking hands with one another, how many handshakes will take place? Understand the Problem: Devise a Plan: Carry Out the Plan: Revise the Solution: 2. The product of the ages, in years, of three (3) teenagers is 4590. None of them have the same age. What are the ages of the teenagers? Understand the Problem: Devise a Plan: Carry Out the Plan: Revise the Solution: 03 Seatwork 3 *Property of STI Page 1 of 1A team of UMD students have invented an inhalable drug that they think will help people breathe better during hard exercise. They test the drug on 3 volunteers (A, B, and C) by measuring their levels of arterial oxygen before receiving the drug (their base level) and then after 5 and 10 minutes have elapsed, respectively. The results are listed in the table. Oxygen level [mmHg] A B C base level 847076 after 5 minutes 85 74 81 after 10 minutes 90 75 98 We want to see how the drug work (better or worse) when compared to the base level. Compute the 90% two-sided confidence intervals for the mean difference between the base level and after 5 minutes. X1b Xub X 1b -5.1783 Xub 11.8450 Compute the 90% two-sided confidence intervals for the mean difference between the base level and after 10 minutes. -1.94 ? Xx 0% 23.94 ? × 0% ? × 0% X 0%
- Use the output provided in the formula sheets folder. In the reduced model, what is the estimated value for betal_hat? O-0.97 0.47 1.08 O -5.64A manufacturer wants to increase the shelf life of a line of cake mixes. Past records indicate that the average shelf life of the mix is 231 days. After a revised mix has been developed, a sample of nine boxes of cake mix gave these shelf lives (in days): 230,233, 235, 236, 233, 240, 240, 241, and 237. Using α = 0.025, has the shelf life of the cake mix increased? Multiple Choice Yes, because computed t is greater than the critical value. Yes, because computed t is less than the critical value. No, because computed t lies in the region of acceptance. No, because 236.11 is quite close to 231.When was the patient received the next intravenous does of The drug in order to maintain a concentration above 1 mg/L and below 8 mg/L.
- Sulfur compounds cause "off-odors" in wine, so winemakers want to know the odor threshold, the lowest concentration of a compound that the human nose can detect. The odor threshold for dimethyl sulfide (DMS) in trained wine tasters is about 25 micrograms per liter of wine (ug/L). The untrained noses of consumers may be less sensitive, however. The DMS odor thresholds for 10 untrained students are given. 30 30 35 22 33 31 29 19 23 (a) Assume that the standard deviation of the odor threshold for untrained noses is known to be o = 7 ug/L. To access the complete data set, click the link for your preferred software format: Excel Minitab14-18 Minitab18+ Minitab18+ JMP SPSS TI R Mac-TXT PC-TXT CSV CrunchIt! Do the three simple conditions hold in this case? Make a stemplot and use it to check the shape of the distribution. Choose the answer that best describes the stemplot. No. Although this is a SRS and o is known, a stemplot shows that the distribution has many outliers and therefore cannot…An EWMA chart is used to monitor a temperature in a pharmaceutical process. An automated measurement is obtained selected every minute and added to the EWMA chart. Experience indicates that o = 0.5 °F. The process target (process mean when in control) is 72 °F. The EWMA uses a lamda value 1=0.3. If the accumulated value of the EWMA at the end of measurement 47 is Z17 = 72.165 and measurement 48 is equal to X49 = 72.466, what will be the accumulated value of the EWMA at the end of measurement 48, that is ZAg = ? 72.255 72.240 72.270 72.285 72.225 not enough informationAn EWMA chart is used to monitor a temperature in a pharmaceutical process. An automated measurement is obtained selected every minute and added to the EWMA chart. Experience indicates that s = 0.5 °F. The process target (process mean when in control) is 72 °F. The EWMA uses a lamda value 2=0.35. If the accumulated value of the EWMA at the end of measurement 47 is Z47 = 72.165 and measurement 48 is equal to X4g = 72.466, what will be the accumulated value of the EWMA at the end of measurement 48, that is Z48 = ? 72.225 72.240 72.285 72.270 not enough information 72.255
- The quality control engineer at Palmer Industries is interested in estimating the tensile strength of steel wire based on its outside diameter and the amount of molybdenum in the steel. As an experiment, she selected 25 pieces of wire, measured the outside diameters, and determined the molybdenum content. Then she measured the tensile strength of each piece. The results of the first four are recorded in the table. Tensile Strength Outside Diameter Amount of Molybdenum Place (PSI ) Y (mm) X1 (Units) X2 A 11 0.3 6 B 9 0.2 5 C 16 0.4 8 D 12 0.3 7 Using a statistical software package, the QC engineer determined the multiple regression equation to be Y’=-0.5+20X1+1X2. a) Based on the equation, what is the estimated tensile strength of a steel wire having an outside diameter of .35 mm and 6.4 units of molybdenum? b) Interpret the value of b1 in the equation.Q1: A FSHN student was trying to see if onion cut in water produces significantly less tears compared to onion cut in the air. She did an experiment on 6 onions. She cut onions into half, one half was chopped in water & the other half was chopped in the air. Here is the amount of tears (in ml) she collected: air: 3.2 2.3 2.6 2.8 3.0 3.7 water: 0.2 0.03 0.09 0.1 0.01 0.15 a) What kind of test would you use to analyze this data? and Why? T test unequal variance, because there is different between variance b) Do you think the onion chopped in the air produce significantly more tears than onion cut in water? Give two reasons from the analysis to support your answer.l TEW LTE 9:56 AM 9 97% Done Photo 3. 3x2 + 8x = 3