VRAAG 1 Pas die term by die korrekte definisie. (4 x ½…
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VRAAG 1 Pаs die term by die kоrrekte definisie. (4 x ½ = 2)
VRAAG 1 Pаs die term by die kоrrekte definisie. (4 x ½ = 2)
VRAAG 1 Pаs die term by die kоrrekte definisie. (4 x ½ = 2)
The medicаl term thаt meаns pоisоn:
This Exаm hаs 106 pоints аvailable but will be graded оut оf 100 points. Please show your work for full credit. If I am not satisfied with your documentation of your steps, I will write a note. (8 points) Determine if the following statements are true or false. Write the full word “true” or “false” to indicate your selection. A Type I error is committed when we reject the null hypothesis even though it is true. For a skewed distribution, the standard deviation will always be a negative number. We reject the null hypothesis when the p-value is larger than the significance level of the test. The width of a confidence interval decreases when the confidence level is increased. The width of a confidence interval decreases when the sample size is increased. The median is less susceptible to outliers than is the mean. When you choose a simple random sample from a population, the population mean and the sample mean always have the same value. In a hypothesis test we determine which hypothesis is most likely to be true. (4 points) Indicate whether the correlation coefficient is likely to be negative, positive, or near zero for each pair of variables. The average length of time for students to wait in line to speak to a counselor and the number of students who visited that day. The weight of an automobile and the number of miles it has been driven in its lifetime. The number of pages in a children’s or young adult book and the intended age of the reader. The average temperature on a winter day and the amount of energy used to run the furnace on that day. (8 points) A researcher selects a sample of cell phone users. For each consumer, she records cell phone carrier, age, amount of data used per month, and brand of phone. Which of these 4 variables are categorical, and which are quantitative? (8 points) A random sample of 25 college students were asked, “How many hours per week typically do you work outside the home?” Their responses were tabulated in the following histogram: Describe the shape of the distribution. Based on the shape, which measure of spread (standard deviation or IQR) better describes hours worked? (8 points) Rosencrantz and Guildenstern are on a weight-reducing diet. Rosencrantz, who weighs 178lb, belongs to an age and body-type group for which the mean weight is 145lb and the standard deviation is 14lb. Guildenstern, who weighs 204lb, belongs to an age and body-type group for which the mean weight is 165lb and the standard deviation is 19lb. Find Rosencrantz’ z-score. Find Guildenstern’s z-score. Who weighs more relative to their body-type group? (14 points) Here are the annual numbers of deaths from tornadoes in the United States from 2008 to 20012. (Source: NOAA). In this problem show your work for full credit. Do not use google sheets. Do not use the statistical functions of your calculator. Show your work.126, 21, 45, 553, 70 Find the mean number of deaths. Find the median of the number of deaths. Find the population standard deviation of the number of deaths. (10 points) Many sharks enter a state of tonic immobility when inverted. Suppose that in a particular species of sharks the time a shark remains in a state of tonic immobility when inverted is normally distributed with mean 11.7 minutes and standard deviation 1.5 minutes. A random sample of 45 sharks is studied. What are the conditions for applying the central limit theorem? Check that those conditions are met. Determine the sampling distribution for the average immobility time of the sample of sharks. Include your calculation of the expected value and standard deviation. Find the probability that the mean immobility time of our sample is between 11.2 and 11.8 minutes. (12 points) Food insecurity is the limited or uncertain availability of nutritionally adequate and safe foods, or the ability to acquire such foods in socially acceptable ways. In a new study, researchers interviewed a random sample of 3,647 community college students and found 445 students who experienced food insecurity. Source: Wood, J. L., Harris III, F., & Delgado, N. R. (2016). Struggling to survive – striving to succeed: Food and housing insecurities in the community college. San Diego, CA: Community College Equity Assessment Lab (CCEAL).We would like to Construct a 98% confidence interval to estimate the proportion of all community college students who experience food insecurity. Compute the sample proportion