In a recent tennis tournament, women playing singles matches used challenges on 138 calls made by the line judges. Among those challenges, 34 were found to b successful with the call overturned. a. Construct a 99% confidence interval for the percentage of successful challenges. b. Compare the results from part (a) to this 99% confidence interval for the percentage of successful challenges made by the men playing singles matches: 20.2%
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- A major company would like to assess the impact of using a professional trainer to conduct a confidence-building workshop with its salespeople. A sample of 16 workers is obtained. Half (n = 8) attend the workshop and the other half (n = 8) serves as a control group. Two weeks later, each of the participants is given a questionnaire measuring the level of self-confidence. The data are as follows: Workshop No Workshp 6 19 13 9 8 18 4 10 13 12 4 14 11 19 5 11 a. Use a two-tailed test with a = .05. Conduct the four steps for hypothesis testing and label each step: Step1, Step 2, Step 3, and Step 4. b. Calculate Cohen's d. c. Are the data sufficient to conclude that thier is a significant difference bewteen groups? Write your answer in the form of a sentence.In a recent tennis tournament, women playing singles matches used challenges on 138 calls made by the line judges. Among those challenges, 34 were found to be successful with the call overturned. a. Construct a 90% confidence interval for the percentage of successful challenges. b. Compare the results from part (a) to this 90% confidence interval for the percentage of successful challenges made by the men playing singles matches: 21.7% < p < 33.2%. Does it appear that either gender is more successful than the other? a. Construct a 90% confidence interval.A researcher surveyed college students in the United States on the typical amount of time each day that they spend interacting with different types of media (television, social media, Internet-connected devices, game consoles, etc.) The researcher found that the mean amount of time that college students spent watching television each day is 135 minutes with a 95% confidence interval of (105, 165). a. State the conclusion the researcher can make from this confidence interval. b. What is the margin of error for the confidence interval?
- Construct a 95% confidence interval for p1 - p2 for a survey that finds 30% of 240 males and 41% of 200 females are opposed to the death penalty. Group of answer choices a.(-0.200, -0.021) b.(-1.532, 1.342) c.(-1.324, 1.512) d.(-0.561, 0.651)In a recent tennis tournament, women playing singles matches used challenges on 137 calls made by the line judges. Among those challenges, 38 were found to be successful with the call overturned. a. Construct a 90% confidence interval for the percentage of successful challenges. b. Compare the results from part (a) to this 90% confidence interval for the percentage of successful challenges made by the men playing singles matches: 24.8%An article regarding interracial dating and marriage recently appeared in a newspaper. Of the 1713 randomly selected adults, 308 identified themselves as Latinos, 324 identified themselves as blacks, 255 identified themselves as Asians, and 779 identified themselves as whites. Among Asians, 79% would welcome a white person into their families, 71% would welcome a Latino, and 66% would welcome a black person. Construct the 95% confidence intervals for the three Asian responses. (Round your answers to four decimal places.) welcome a white person , welcome a Latino , welcome a black person ,A linguist at a large university was studying the word length of papers submitted by students enrolled in humanities programs. From a random sample of 25 papers, the linguist counted the number of words used in each paper. The 95 percent confidence interval was calculated to be (20,995, 22,905).A genetic experiment with peas resulted in one sample of offspring that consisted of 425 green peas in a 162 yellow peas. a. Construct a 95% confidence interval to estimate of the percentage of yellow peas. b. it was expected at 25% of the offspring peas would be yellow. Given the percentage of offspring yellow peas is not 25%, do the results contradict expectations?The “Pro-Wealth” insurance wants to calculate the difference between the average amount of term life insurance purchased per family and the average amount of life time insurance purchased per family. To obtain this data, one of the company's actuaries randomly selects 25 families who have term life insurance only and 27 families who have life time insurance only. Each sample was taken from families where the head was less than 45 years old. Use the data obtained with a confidence level of: 96%, to estimate the difference in the mean between the two groups, assuming the amount of insurance is normally distributed. For term insurance (term): xT = $ 76,000 sT = $ 22,500 and nT = 25 , while for whole life insurance: xT = $ 46,000 sT = $ 15,600 and nT = 27.A major company would like to assess the impact of using a professional trainer to conduct a confidence-building workshop with its salespeople. A sample of 16 workers is obtained. Half (n = 8) attend the workshop and the other half (n = 8) serve as a control group. Two weeks later, each of the participants is given a questionnaire measuring the level of self-confidence. The data are as follows: Controls Workshop M = 17.5 M = 22.7 SS = 100 SS = 124 What type of t-test would you have to conduct in this scenario? Are the data sufficient to conclude that the treatment has a significant effect? Use a two-tailed test with α = .05. State the hypothesis, find the critical region, calculate your test statistic, evaluate your hypothesis then calculate the Cohen’s d measure for this scenario. State whether this is a weak, moderate, or strong effect.Of 40 bank customers depositing a check, 17 received some cash back. Construct a 90 percent confidence interval for the proportion of all depositors who ask for cash back. (round your answer four decimals places.)In a recent tennis tournament, women playing singles matches used challenges on 139 calls made by the line judges. Among those challenges, 33 were found to be successful with the call overturned. a. Construct a 99% confidence interval for the percentage of successful challenges. b. Compare the results from part (a) to this 99% confidence interval for the percentage of successful challenges made by the men playing singles matches: 17.9%SEE MORE QUESTIONSRecommended textbooks for youMATLAB: An Introduction with ApplicationsStatisticsISBN:9781119256830Author:Amos GilatPublisher:John Wiley & Sons Inc
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