Eighteen middle-aged women with platelet readings between 120,000 platelets per microliter and 150,000 platelets per microliter of blood were selected randomly from the population of similar female patients at alarge local hospital. Nine of the 18 women were assigned randomly to group A and received a placebo. The other nine women were assigned to group B and received a new platelet drug. After four months,posttreatment platelet readings were taken for all 18 women and were compared with pretreatment readings. The reduction in platelet level (Pretreatment reading - Posttreatment reading) for each woman in the studyis shown here.Group A (placebo) increase (in platelets per microliter): 2,000, 5,000, 7,050, 10,125, 12,345, 17,350, 13,250, 12,200, 9,125Group B (platelet drug) increase (platelets per microliter): 28,450, 23,438, 36,380, 12,450, 16, 100, 21,350, 39,400, 41,000, 14,325Create and interpret a 95% confidence interval for the difference in the placebo and the new drug.

The data is shown below:Group AGroup…

Answered: Eighteen middle-aged women with…

Holt Mcdougal Larson Pre-algebra: Student Edition 2012

1st Edition

ISBN:9780547587776

Author:HOLT MCDOUGAL

Publisher:HOLT MCDOUGAL

Chapter11: Data Analysis And Probability

Section: Chapter Questions

Problem 8CR

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List the sample space of each experiment. Picking a one-digit number
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What is meant by the sample space of an experiment?
List the sample space of each experiment. Selecting a letter of the alphabet
What is an experiment?
In a clinical trial, 780 participants suffering from high blood pressure were randomly assigned to one of three groups. Over a one-month period, the first group received a low dosage of an experimental drug, the second group received a high dosage of the drug, and the third group received a placebo. The diastolic blood pressure of each participant was measured at the beginning and at the end of the period and the change in blood pressure was recorded. Identify the experimental units (subjects).
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The Children's Hospital of Orange County (CHOC) recommends that children drink the number of 8- ounce cups of water equal to their age. This means that a five-year-old child should drink five 8- ounce cups of water each day (40 oz of water). Suppose a sample of 50 five-year-old children was randomly selected from all residents of Irvine, CA. Families of the children were asked to record their child's water consumption for two consecutive days on a weekend and the average number of ounces of water over the two days was recorded as the estimated daily water intake for each child. The study started in June and ended in August. Suppose you find that the average water intake of all five-year-olds in the sample is 37 ounces per day with a standard deviation of 4.5 oz. 14. Based on the 95% Cl of (35.25193, 38.87857), which of the following values is plausible for a p- value? 0.2505 0.85 0.95 0.002505
A study used 1259 patients who had suffered a stroke. The study randomly assigned each subject to an aspirin treatment or a placebo treatment. During a 3-year follow-up period, in Sample 1, 634 people received placebo treatments and 25 people died from heart attack. In sample 2, 625 people received aspirin treatment and 18 died from heart attack. Let pl denote the population proportion of death from heart attack for those with no treatment and p2 denote the population proportion of death from heart attack for those with aspirin treatment. (c) Which of SEO and SE1 is used for calculating a confidence interval for comparing two population proportions? Which is used for calculating the test statistic in a hypothesis test? (d) Construct the 95% confidence interval for pi – p2. Interpret.
Fifteen inbred laboratory rats (Rattus norvegi-cus) were randomly assigned to three groups of five each. Each rat was inoculated with Staphylococcus mucans, a bacterium involved in the process of tooth decay. One group (control) was given no additional treatment. A second group was given drug A, and a third group was given drug B. At the end of six weeks, the extent of tooth decay in the rats was evaluated as percent of tooth decay. This is a fairly subjective measurement based on the combined evaluation of three observ-ers and should probably be regarded as an ordinal measurement. We wish to know if there is a difference among the three groups.
In clinical trails of Nasonex, 3774 adult and adolenscent allergy patients 12 years and older were randomly divided into two groups. The patient in group1 (experimental group) received 200 microgram of Nasonex, while the patient in group 2( control group) receiced a placebo. Of the 2103 patients in the experimental group 547 reported headaches as a side effect. Of the 1671 patients in the control group, 368 reported headaches as a side effect. Determine if the proportion of those taking Nasonex who experienced headaches as a side effect differs from that of those taking the placebo who experienced headaches as a side effect. A) state the null and alternative hypothese: B) construct a 95% confidence interval for the difference between these groups round to 4 places. Intervals: C)using intervals, state conclusion in the language of the problem.

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