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Hogar Banco de preguntas Matemáticas Estadísticas Archive 2024 December 17

Statistics Questions from Dec 17,2024

Browse the Statistics Q&A Archive for Dec 17,2024, featuring a collection of homework questions and answers from this day. Find detailed solutions to enhance your understanding.

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Сурагчдын бодсон бодлогуудын , стандарт хазайлт нь 2 бол хэдэн сурагчаас өгегдөл цутлуулсан бэ?. This question: 4 point(s) possible A data set about speed dating includes "like" ratings of male dates made by the female dates. The summary statistics are . Use a 0.05 significance level to test the claim that the population mean of such ratings is less than 7.00 . Assume that a simple random sample has been selected. Identify the null and alternative hypotheses, test statistic, -value, and state the final conclusion that addresses the original claim. This test: 198 point(s) possible This question: 4 point(s) possible A data set includes times (in minutes) of taxi cab rides in New York City yellow cabs during a Friday morning of the same day in a recent year. Using 38 of the times to test the claim that the mean of all such times is less than 15 minutes, the accompanying Minitab display is obtained. Test the given claim by using the display provided from Minitab. Use a 0.01 significance level. (i) Click the icon to view the Minitab display. This test: 198 point(s) possible The claim is that smokers have a mean cotinine level greater than the level of . found for nonsmokers. (Cotinine is used as a biomarker for exposure to nicotine.) The sample size is and the test statistic is . Use technology to find the P -value. Based on the result, what is the final conclusion? Use a significance level of 0.10 . 1. Se pidió a un grupo de 18 sujetos (Grupo 1) que en 2 minutos armaran la mayor cantidad de palabras posibles a partir de un conjunto desordenado de letras. Se usó la cantidad de palabras correctas armadas como indicador de la habilidad de cada sujeto. Los resultados fueron: Otro grupo de 18 sujetos (Grupo 2) realizó la misma tarea. Los resultados fueron: Con los datos anteriores calcule la Varianza, la Desviación estándar, y su coeficiente de variación According to a study done by the Gallup organization, the proportion of Americans who are satisfied with the way things are going in their lives is 0.82 Complete parts (a) through (e). (a) Suppose a randorn sample of 100 Americans is asked, "Are you satisfied with the way things are going in your life?" Is the response to this question qualitative or quantitative? Explain. A. The response is quantitative because the number of people satisfied can be counted. B. The response is quantitative because the responses can be clessified based on the characteristic of being satisfied or not. c. The response is qualitative because the responses can be classified based on the characteristic of being D. The response is qualitative because the number of people satisfied can be counted (b) Explain why the sample proportion, , is a random variable. What is the source of the variability? A. The sample proportion is a random variable because the value of represents a random person included in the sample. The variability is due to the fact that people may not be responding to the question truthfully. B. The sample proportion is a random variable because the value of varies from sample to sample. The variability is due to the fact that different people feel differently regarding their satisfaction. C. The sample proportion is a random variable because the value of represents a random person included in the sample. The variability is due to the fact that different people feel differently regarding their satisfaction. Describe the sampling distribution of . Assume the size of the population is 20,000 Choose the phrase that best describes the shape of the sampling distribution of below. A. Not normal because and . Not normal because and . Approximately normal because and . C. Aproximately normal because and . Determine the mean of the sampling distribution of . (Round to one decimal place as needed.) Determine the standard deviation of the sampling distribution of . (Round to three decimal places as needed.) The data points on the scatter plot below show the number of hours worked and the amount of money spent on entertainment last week by each of 24 students. Draw the line of best fit for these data points. (It doesn't have to be the exact line of best fit. Just draw your best approximation.) Determine and from the given parameters of the population and sample size. (Round to three decimal places as needed.) If a scatter plot shows points that are closely clustered together, what can you infer about the correlation between the variables?
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