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Home Question Bank Math Statistics Archive 2024 November 04

Statistics Questions from Nov 04,2024

Browse the Statistics Q&A Archive for Nov 04,2024, featuring a collection of homework questions and answers from this day. Find detailed solutions to enhance your understanding.

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Question 4 4) List the FOUR COMMON confidence levels that we used in ascending order. 3) 520 randomly selected light bulbs were tested in a laboratory, 115 lasted more than 400 hours. Find a point estimate of the proportion of all the light bulbs that last more than 400 hours. Round to 4 decimals. 2) To find the critical \( t \)-score \( t_{\frac{a}{2}} \) the degree of freedom is not necessary. O True False 1) In a survey of 3300 T.V. viewers, \( 30 \% \) said they watch network news programs. Find the margin of error for this survey if we want \( 98 \% \) confidence in our estimate of the percent of T.V. viewers who watch network news programs. Round to 4 decimals. ce jour-là,. Il dit : «Si une personne test est positif à \( 99 \% \). Si une persor malade, le test est positif à \( 15 \% . » ~ \) impressionné, vu l'urgence et il dé appel au statisticien du ministère. I d'obtenir auprès de lui la probabilité malade un individu négatif au te statisticien affirme qu'il a un repos longue durée. Tu dis alors à ton oncle que tu es ca fournir les mêmes résultats que le sta Rédige une réponse argumentée app connaissances mathématiques. 2. The number of minutes on the phone and the customer satisfaction rating have a weak negative relationship. Explain what it means to have a weak negative relationship in this context. Assume that the readings at freezing on a bundle of thermometers are normally distributed with a mean of \( 0^{\circ} \mathrm{C} \) and a standard deviation of \( 1.00^{\circ} \mathrm{C} \). A single thermometer is randomly selected and tested. Find the probability of obtaining a reading between \( -1.332^{\circ} \mathrm{C} \) and \( 0.27^{\circ} \mathrm{C} \). \( P(-1.332<Z<0.27)= \) Assume that the readings at freezing on a bundle of thermometers are normally distributed with a mean of \( 0^{\circ} \mathrm{C} \) and a standard deviation of \( 1.00^{\circ} \mathrm{C} \). A single thermometer is randomly selected and tested. Find the probability of obtaining a reading less than \( -3.092^{\circ} \mathrm{C} \). \( P(Z<-3.092)= \) Question Help: D Post to forum The mass of a species of mouse commonly found in houses is normally distributed with a mean of 19.2 grams with a standard deviation of 0.15 grams. Use Stapplet or another Normal Calculator to find the probabilities and cutoff values. For parts (a) through (c), enter a decimal with 4 decimal places. Use 1 place for part \( d \). a) What is the probability that a randomly chosen mouse has a mass of less than 19.14 grams? b) What is the probability that a randomly chosen mouse has a mass of more than 19.37 grams? c) What proportion of mice have a mass between 19.11 and 19.32 grams? d) \( 30 \% \) of all mice have a mass of less than The amount of time to complete a physical activity in a PE class is approximately normally distributed with a mean of 38 seconds and a standard deviation of 6.8 seconds. Enter decimal answers rounded to 4 decimal places for a-c, 1 place for part d. a) What is the probability that a randomly chosen student completes the activity in less than 33 seconds? b) What is the probability that a randomly chosen student completes the activity in more than 42.3 seconds? c) What proportion of students take between 33.8 and 42.8 seconds to complete the activity? d) \( 70 \% \) of all students finish the activity in less than
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