The standard deviation is closest to: A. 7.92kg B. 8.63kg C.8.04kg D.9.21kg
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The standard deviation is closest to:
A. 7.92kg B. 8.63kg C.8.04kg D.9.21kg
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- Population Genetics In the study of population genetics, an important measure of inbreeding is the proportion of homozygous genotypesthat is, instances in which the two alleles carried at a particular site on an individuals chromosomes are both the same. For population in which blood-related individual mate, them is a higher than expected frequency of homozygous individuals. Examples of such populations include endangered or rare species, selectively bred breeds, and isolated populations. in general. the frequency of homozygous children from mating of blood-related parents is greater than that for children from unrelated parents Measured over a large number of generations, the proportion of heterozygous genotypesthat is, nonhomozygous genotypeschanges by a constant factor 1 from generation to generation. The factor 1 is a number between 0 and 1. If 1=0.75, for example then the proportion of heterozygous individuals in the population decreases by 25 in each generation In this case, after 10 generations, the proportion of heterozygous individuals in the population decreases by 94.37, since 0.7510=0.0563, or 5.63. In other words, 94.37 of the population is homozygous. For specific types of matings, the proportion of heterozygous genotypes can be related to that of previous generations and is found from an equation. For mating between siblings 1 can be determined as the largest value of for which 2=12+14. This equation comes from carefully accounting for the genotypes for the present generation the 2 term in terms of those previous two generations represented by for the parents generation and by the constant term of the grandparents generation. a Find both solutions to the quadratic equation above and identify which is 1 use a horizontal span of 1 to 1 in this exercise and the following exercise. b After 5 generations, what proportion of the population will be homozygous? c After 20 generations, what proportion of the population will be homozygous?Poverty and Dietary Calcium. Calcium is the most abundant mineral in the human body and has several important functions. Recommendations for calcium are provided in Dietary Reference Intakes, developed by the Institute of Medicine of the National Academy of Sciences. The recommended adequate intake (RAI) of calcium for adults (ages 19–50) is 1000 milligrams (mg) per day. If adults with incomes below the poverty level have a mean calcium intake equal to the RAI, what percentage of all samples of 18 such adults have mean calcium intakes of at most 947.4 mg? Assume that σ = 188 mg. State any assumptions that you are making in solving this problem.Twins In 2000 The Journal of the American MedicalAssociation published a study that examined a sample ofpregnancies that resulted in the birth of twins. Birthswere classified as preterm with intervention (inducedlabor or cesarean), preterm without such procedures, or term or postterm. Researchers also classified the pregnan-cies by the level of prenatal medical care the mother received (inadequate, adequate, or intensive). The data,from the years 1995–1997, are summarized in the tablebelow. Figures are in thousands of births. (JAMA 284[2000]: 335–341)Is there evidence of an association between the durationof the pregnancy and the level of care received by themother? Twin Births, 1995–1997 (in Thousands)Preterm(induced orCesarean)Preterm(withoutprocedures)Term orpostterm Total Level ofPrenatal CareIntensive 18 15 28 61Adequate 46 43 65 154Inadequate 12 13 38 63Total 76 71 131 278
- Reliability Engineering exerciseAfter the pandemic hit and people were forced to spend more time indoors, there have been a suspicion among health professionals. that people are eating more and thus gaining weight. In 2018, the average weight of 192 pounds, and health experts want to know if that average weight of the American male has gone up during this pandemic. a. What is the population for which inferencing is being done in this problem? b. What is the population parameter for which inferencing is being done? c. Formulate the hypotheses that can be used by the health expert to confirm their suspisionMedian House Value ($) Walkability (1 is good, 2 is fair, and 3 is bad) 509,300 1 251,800 2 220,100 3 242,600 2 417,400 1 356,900 2 191,700 3 281,300 2 145,200 3 161,800 3 170,000 3 167,900 3 425,100 1 179,100 3 785,100 1 310,300 2 152,600 3 362,100 1 439,000 1 344,800 2 532,300 1 345,900 2 236,400 2…
- At noon time, customers arrive at Metrobank counter managed by a single cashier with mean arrival rate of 6 customers per hour. The cashier attends the customers on first come first served basis at 10 customers per hour.What is the waiting time of a customer in the system?[Econometrics] The World Bank hires you to analyze the effect of the introduction of new irrigation systems in a series of Sub-Saharan African countries. They are particularly interested on their effect in the crop production of each country. They give you data for each country on the kilometers of irrigation tubes constructed, the total crop harvest, as well as information on the average educational attainment for each year between 2000 and 2017. Which type of analysis would you perform based on this information?PETROGAS is testing new filters for its motorbikes. One brand of filter (Filter A) is placed in one motorbike, and the other brand (Filter B) is placed in the second motorbike. Random samples of air released from the motorbikes are taken at different times throughout the day. Pollutant concentrations are measured for both motorbikes at the same time. The following data attached represent the pollutant concentrations (in parts per million) for samples taken at 20 different times after passing through the filters. a. Test the hypothesis that the mean for the pollutant concentration for Filter B is greater than 30. Use the 1% level of significance. b. Construct a 95% confidence interval for the difference in mean pollutant concentration, where a difference is equal to the pollutant concentration passing through Filter A minus the passing through Filter B. c. Using the 5% significance level, determine whether there is evidence that mean for the pollutant concentration for Filter A…
- Nexium is a drug that can be used to reduce the acid produced by the body and heal damage to the esophagus. A researcher wants to estimate the proportion of patients taking Nexium that are healed within 8 weeks. A random sample of 224 patients suffering from acid reflux disease is obtained, and 213 of those patients were healed after 8 weeks. a. Identify the population of interest and sample of interest. what is the sample size? b. Describe the parameter of interest. c. Describe the statistic of interest. What value of the statistic obtained?Smartphone Battery Life. Battery life is an important issue for many smartphone owners. Public health studies have examined “low-battery anxiety” and acute anxiety called nomophobia that results when a smartphone user’s phone battery charge runs low and then dies (Wall Street Journal, https://www.wsj.com/articles/your-phone-is-almost-out-of-battery-remain-calm-call-a-doctor-1525449283). Battery life between charges for the Samsung Galaxy S9 averages 31 hours when the primary use is talk time and 10 hours when the primary use is Internet applications. Because the mean hours for talk time usage is greater than the mean hours for Internet usage, the question was raised as to whether the variance in hours of usage is also greater when the primary use is talk time. Sample data showing battery life between charges for the two applications follows. Primary Use: Talking35.8 22.2 24.0 32.6 18.5 42.5 28.0 23.8 30.0 22.8 20.3 35.5Primary Use: Internet14.0 12.5 16.4…Characteristics Treatment Control P-value Mean SBP 115.3889± 113.0588±6.805 Mean difference (SBP) -0.66±3.0292 2.117 ±2.471 0.005347 Mean DBP 74.556± 7.366 72.4705±6.374 Mean difference (DBP) -1.888±2.9483 1.411765 ±3.3343 0.002233 Mean Pulse rate 96.222±13.0 88.94±15.43725 Mean difference -9.444± 0.5294118± 0.3529523 write an analysis for the data above and what does the p value mean?
