MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER An economist is studying the job market in Denver area neighborhoods. Let x represent the total number of jobs in a given neighborhood, and let y represent the number of entry-level jobs in the same neighborhood. A sample of six Denver neighborhoods gave the following information (units in hundreds of jobs). 13 34 52 28 50 25 2 6 3 6 n USE SALT Complete parts (a) through (e), given Ex = 202, Ey - 27, Ex? = 7938, Ey? = 159, Exy = 1071, and r 0.7844. (a) Draw a scatter diagram displaying the data. 50 용 40 30 20 30 40 8. 9 x (total number of jobs (in hundreds)) x (total number of jobs (in hundreds)) 30 ntry-level jobs (in hundreds)) y (number of entry-level jobs (in hundreds) of entry-level jobs (in hundreds)) y(number of entry-level jobs (in hundreds))
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- You are interested in enhancing the performance of runners in a 10-kilometer event. You randomly select 40 runners and randomly assign them to one of two diet groups. During the 24 hours prior to the 10K run you feed the experimental group a special diet of 80% of their calories from carbohydrates and ad lib water intake. During the 24 hours prior to the event you tell the control group to eat what they normally would eat and drink prior to a 10-K race. Prior to running the event you measure the glycogen content of the quadriceps muscle in mg/kilogram of wet muscle of each subject. You also measure the individual’s time to run the 10K event. Thus, the purpose of your study is to determine the effect of a high carbohydrate diet on glycogen content of the muscle and 10k performance. A secondary purpose is to examine the relationships between glycogen content of the quadriceps and 10K performance. Restate the purpose(s) and formulate Research Hypotheses to address the purposeYou are interested in enhancing the performance of runners in a 10-kilometer event. You randomly select 40 runners and randomly assign them to one of two diet groups. During the 24 hours prior to the 10K run you feed the experimental group a special diet of 80% of their calories from carbohydrates and ad lib water intake. During the 24 hours prior to the event you tell the control group to eat what they normally would eat and drink prior to a 10-K race. Prior to running the event you measure the glycogen content of the quadriceps muscle in mg/kilogram of wet muscle of each subject. You also measure the individual’s time to run the 10K event. Thus, the purpose of your study is to determine the effect of a high carbohydrate diet on glycogen content of the muscle and 10k performance. A secondary purpose is to examine the relationships between glycogen content of the quadriceps and 10K performance. Calculate the appropriate statistic to determine if Ho is rejected or accepted and…You are interested in enhancing the performance of runners in a 10-kilometer event. You randomly select 40 runners and randomly assign them to one of two diet groups. During the 24 hours prior to the 10K run you feed the experimental group a special diet of 80% of their calories from carbohydrates and ad lib water intake. During the 24 hours prior to the event you tell the control group to eat what they normally would eat and drink prior to a 10-K race. Prior to running the event you measure the glycogen content of the quadriceps muscle in mg/kilogram of wet muscle of each subject. You also measure the individual’s time to run the 10K event. Thus, the purpose of your study is to determine the effect of a high carbohydrate diet on glycogen content of the muscle and 10k performance. A secondary purpose is to examine the relationships between glycogen content of the quadriceps and 10K performance. For each statistical hypothesis set indicate the type of question (Descriptive,…
- Meteoroids. In the article “Interstellar Pelting” (Scientific American, Vol. 288, No. 5, pp. 28–30), G. Musser explained that information on extrasolar planets can be discerned from foreign material and dust found in our solar system. Studies show that 1 in every 100 meteoroids entering Earth’s atmosphere is actually alien matter from outside our solar system. a. Of 300 meteoroids entering the Earth’s atmosphere, how many would you expect to be alien matter from outside our solar system? Justify your answer. b. Apply the Poisson approximation to the binomial distribution to determine the probability that, of 300 meteoroids entering the Earth’s atmosphere, between 2 and 4, inclusive, are alien matter from outside our solar system. c. Apply the Poisson approximation to the binomial distribution to determine the probability that, of 300 meteoroids entering the Earth’s atmosphere, at least 1 is alien matter from outside our solar system.What is the minimum information that you need to calculate an n2 effect size from a reported independent samples t-test? t and df the M1 - M2 value and Sp S21, S22, and n1, n2 none of the abovePlease use the following information to answer questions 3d-3g: A random sample of n = 25 individuals is selected from a population with µ = 20, and a treatment is administered to each individual in the sample. After treatment, the sample mean is found to be x̅ = 22.2 with SS = 384. 3d. Which of the following represents the critical region for this mentioned sample (MUST SHOW WORK FOR THIS PROBLEM)? a. t = 2.064 b. t = ±1.711 c. t = 1.711 d. t = ±2.064 3e. Compute the test statistic (t-observed) for the mentioned sample (MUST SHOW WORK FOR THIS PROBLEM). 3f. Based on the calculated test statistic, would you reject the null hypothesis established in question 3a (MUST SHOW WORK FOR THIS PROBLEM)? a. yes b. no 3g. Based on the previously conducted steps, can it be concluded that the treatment had a significant effect (MUST SHOW WORK FOR THIS PROBLEM)? Group of answer choices a. yes b. no
- You are conducting quality control for a company that manufactures LED displays. The factory you are assessing is supposed to have a manufacturing defect rate of 1 in 100 LED displays. As part of your assessment, you want to verify this defect rate by analyzing a random sample of LED displays. You are planning to randomly sample 1500 displays from this factory and observe how many of them contain manufacturing defects. Let Zi be equal to 1 if the i’th display has a defect and 0 otherwise, for i = 1,...,1500. (a) What is the statistic that you will use to estimate the defect rate for this factory? How do you compute it using Z1, Z2, . . . , Z1500? (b) Assuming that the true defect rate for this factory is in fact 1 in 100 displays, can we approximate the sampling distribution of the statistic that you selected in part (a) using a normal distribution? Please state and check the requirements for applying the approximation, and identify the mean and standard deviation of the normal…The accompanying table gives summary data on cube compressive strength (N/mm2) for concrete specimens made with a pulverized fuel-ash mix. Age(days) Sample Size Sample Mean Sample SD 7 69 26.94 4.84 28 71 35.77 6.46 Calculate a 99% CI for the difference between true average 7-day strength and true average 28-day strength. (Use H0: ?7 − ?28 = 0. Round your answers to two decimal places.) , N/mm2 Determine the number of degrees of freedom for the two-sample t test or CI in each of the following situations. (Round your answers down to the nearest whole number.) (a) m = 12, n = 10, s1 = 5.0, s2 = 6.0 (b) m = 12, n = 15, s1 = 5.0, s2 = 6.0 (c) m = 12, n = 15, s1 = 4.0, s2 = 6.0 (d) m = 10, n = 24, s1 = 5.0, s2 = 6.0How many tissues should a package of tissues contain? Researchers determined that 68 tissues is the average number of tissues used during a cold. Suppose a random sample of 100 tissue users yielded the following data on the number of tissues used during a cold: x=63, s=17. Suppose the alternative we wanted to test was Ha: μ < 68. State the correct rejection region for &=.05. Select one: A. Reject H0 if z < -1.645. B. Reject H0 if z > 1.96 or z < -1.96. C. Reject H0 if z < -1.96. D. Reject H0 if z > 1.645.
- A population of trees has a mean leaf length of 6.2 inches. A sample of 17 of these trees in a particular neighborhood has a mean length of 3.2 inches. If SS = 144 for this sample, what is Cohen's d for this example, and what is the strength of the treatment effect, which in this case is growing in a particular neighborhood?A veterinary nutritionist developed a diet for overweight dogs. The total volume of food consumed remains the same, but one-half of the dog food is replaced with a low-calorie “filler” such as canned green beans. Six overweight dogs were randomly selected from her practice and were put on this program. Their initial weights were recorded, and they were weighed again after 4 weeks. The results of the experiment are shown below. At α=0.05, can it be concluded that the dogs significantly lost weight?