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Home Question Bank Math Statistics Archive 2024 December 18

Statistics Questions from Dec 18,2024

Browse the Statistics Q&A Archive for Dec 18,2024, featuring a collection of homework questions and answers from this day. Find detailed solutions to enhance your understanding.

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Ejercicio3: De acuerdo con las normas establecidas en una prueba de aptitud académica, las personas que han concluido sus estudios secundarios debian tener un promedio de 76.7 puntos. Si se sabe por una investigación anterior sobre el caso, que la desviación estándar fue de 8.6 puntos y si 45 personas que concluyeron estudios secundarios son elegidos aleatoriamente y alcanzan un promedio de 73.2 , pruebe la hipótesis de que el promedio ha disminuido. Utilice un nivel de confianza del \( 99 \% \) para aclarar esta cuestión. Числовой ряд имеет стандартное отклонение, равное 13. 1. Найди дисперсию: 2. Если все числа ряда уменьшить на 4, то дисперсия отклонение 8. Compute Standard Deviation for the following data se \( 22,20,19,17,17,17,16,16,14,12 \) A hypothesis test was used with \( \alpha=0.05 \) to see if vegetarian students have a higher average GPA than meat eating students. The P-value for this test was 0.04 . Then there is sufficient evidence to conclude that vegetarian students do have a higher average GPA than meat eating students. true false What is a scatter plot? A researcher tested the hypothesis that lefties have higher IQs than righties. After analyzing the sample data the researcher failed to reject the null hypothesis. In this case a type I error could not have occurred. false true A hypothesis test was used to test the hypothesis that men drive faster on average than women. The \( p \) - value was 0.16 and the level of significance used was 0.1 . Then there is sufficient evidence to conclude that, on average, men drive faster then women. false true A hypothesis test was used to test the hypothesis that people with a significant other are happier on average than people without. The \( P \)-value was 0.07 and the level of significance used was 0.1 . Then there is sufficient evidence to conclude that, on average, people with a significant other are happier than single people. true false Assume that the salaries of public school teachers in the United States are normally distributed with a mean of \( \$ 32,000 \) and a standard deviation of \( \$ 3000 \). If a teacher is selected at random, find the probability that the teacher makes more than \( \$ 36,000 \). The number of ounces of water a person drinks per day is normally distributed with a standard deviation of 15 ounces. If Sean drinks 88 ounces per day with a \( z \)-score of 1.6, what is the mean ounces a day of water that a person drinks? \( \mu= \) type your answer... \( \quad \) ounces
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