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Home Question Bank Math Statistics Archive 2024 November 03

Statistics Questions from Nov 03,2024

Browse the Statistics Q&A Archive for Nov 03,2024, featuring a collection of homework questions and answers from this day. Find detailed solutions to enhance your understanding.

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Claim: The mean systolic blood pressure of all healthy adults is less than than 119 mm Hg . Sample data: For 260 healthy adults, the mean systolic blood pressure level is 118.84 mm Hg and the standard deviation is 16.09 mm Hg . The null and alternative hypotheses are \( \mathrm{H}_{0}: \mu=119 \) and \( \mathrm{H}_{1}: \mu<119 \). Find the value of the test statistic. The value of the test statistic is (Round to two decimal places as needed.) Homework \( \leftarrow \) Claim: Fewer than \( 93 \% \) of adults have a cell phone. In a reputable poll of 1153 adults, \( 85 \% \) said that they have a cell phone. Find the value of the test statistic. \( 33.33 \%, 4 \) of 12 points The value of the test statistic is \( \square \). (Round to two decimal places as needed.) Engineers must consider the breadths of male heads when designing helmets. The company researchers have determined that the population of potential clientele have head breadths that are normally distributed with a mean of 6.5 -in and a standard deviation of 0.9 -in. In what range would you expect to find the middle \( 68 \% \) of most head breadths? Between \( \square \) and If you were to draw samples of size 40 from this population, in what range would you expect to find the middle \( 68 \% \) of most averages for the breadths of male heads in the sample? Between \( \square \) and Enter your answers as numbers. Your answers should be accurate to 2 decimal places. Exercice 3 Internet très haut débit Un nouveau fournisseur d'accès à internet par fibre optique a enregistré 2800 abonnements le mois de son lancement et prévoit une augmentation mensuelle de 500 abonnements pendant trois ans. 1. Déterminer à l'aide d'un tableur l'évolution du nombre des ventes mensuelles d'abonnements sur les dix ans. 2. Représenter graphiquement cette suite de nombres. Assume that the readings at freezing on a batch 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. If \( 4.8 \% \) of the thermometers are rejected because they have readings that are too high and another \( 4.8 \% \) are rejected because they have readings that are too low, find the two readings that are cutoff values separating the rejected thermometers from the others. interval of acceptable thermometer readings =
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