need help in this question 1)A company claims that its new viral vaccine is 90% effective in preventing a contagious viral disease. Suppose that in a clinical trial with 3000 respondents, 2640 did not get infected by this disease. Which is an appropiate test? a)No answer text provided. b)left-tailed z-test c)two-tailed z-test d) right-tailed z-test

need help in this question 1)A company claims that its new viral vaccine is 90% effective in preventing a contagious viral disease. Suppose that in a clinical trial with 3000 respondents, 2640 did not get infected by this disease. Which is an appropiate test? a)No answer text provided. b)left-tailed z-test c)two-tailed z-test d) right-tailed z-test

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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state whether the investigation in question is an observational study or a designed experiment. Justify your answer in each case. Aspirin and Cardiovascular Disease. In the article by P. Ridker et al. titled “A Randomized Trial of Low-dose Aspirin in the Primary Prevention of Cardiovascular Disease inWomen” (New England Journal of Medicine, Vol. 352, pp. 1293–1304), the researchers noted that “We randomly assigned 39,876 initially healthy women 45 years of age or older to receive 100 mgof aspirin or placebo on alternate days and then monitored them for 10 years for a rst major cardiovascular event (i.e., nonfatal myocardial infarction, nonfatal stroke, or death from cardiovascular causes).”
Random samples of resting heart rates are taken from two groups. Group 1 exercises regularly, and Group 2 does not. The data from these two samples is given below: Group 1: 62, 71, 62, 68, 69, 69, 72 Group 2: 78, 74, 73, 76, 76, 71, 70, 76 Is there evidence, at an a = 0.07 level of significance, to conclude that there those who exercise regularly have lower resting heart rates? Carry out an appropriate hypothesis test, filling in the information requested. A. The value of the standardized test statistic (round summary statistics to 3 decimal places and test statistic to three decimal places): Note: For the next part, your answer should use interval notation. An answer of the form (-∞, a) is expressed (-infty, a), an answer of the form (b, ∞) is expressed (b, infty), and an answer of the form (-∞, a) U (b, ∞) is expressed (-infty, a)U(b, infty). B. The rejection region for the standardized test statistic: C. The p-value is D. Your decision for the hypothesis test: A. Reject H₁. B. Do…
Assume that a simple random sample has been selected from a normally distributed population and test the giving claim. Identify the Null and alternative hypothesis, test statistic, and state the final conclusion thatAddresses the original claim. A safety administration conducted crash tests of child booster seats for cars. Listed below are results from those test, with the measurements given in standard head injury condition units A safety administration conducted crash tests of child booster seats for cars. Listed below are results from those test, with the measurements given in standard head injury condition units (Hic). The safety requirement is that the HIC measurement should be less than 1000 hic. Use a 0.01 significance level to test the claim that the sample is from a population with a mean less than 1000 H I see. Do the results suggest that all of the child booster seats meet the specific requirement? 650, 600, 1033, 561, 538, 716 What are the hypotheses?Identify the test…
It is found that playing a specialized type of video game helps with hand-eye coordination. However, it turns out that this result was incorrect as other studies could not replicate the finding. Is this Type I or Type II error?
When neither the subject nor those having contact with the subject know the treatment assignment, the study is called unbiased. double-blind. blind. statistically significant. randomized.
Give two examples of Bernoulli trials other than those presented in the text.
A large clinical trial of the effect of diet on breast cancer assigned women at random to either a normal diet or a low-fat diet. To check that the random assignment did produce comparable groups, we can compare the two groups at the start of the study. Asked if there is a family history of breast cancer: 1276 of the 5964 women in the low-fat group and 1507 of the 7726 women in the control group said "Yes." If the random assignment worked well, there should not be a significant difference in the proportions with a family history of breast cancer. How significant is the observed difference? State: Is there evidence of a difference in the proportion of women with a family history of breast cancer between the treatment and control groups? Plan: Let pi be the proportion for the treatment group, and Pz the proportion for the control group. State the hypotheses for your test. Ha:Pi + P2 Solve: Give the value of the test statistic. Use the calculator. Select an answer ♥ Ho:pi = p2 What is the…
In the past 10 years, the prevalence of peanut allergies has doubled in Western countries. Is consumption or avoidance of peanuts in infants related to the development of peanut allergies in infants at risk? Subjects included infants between four and 11 months with severe eczema, egg allergy, or both but who did not display a preexisting sensitivity to peanuts based on a skin-prick test. The infants were randomly assigned to either a treatment that avoided consuming peanut protein or a treatment in which at least 6 grams of peanut protein were consumed per week. The response was the presence or absence of peanut allergy at 60 months of age. In the avoidance group containing 263 infants, 36 had developed a peanut allergy at 60 months of age, while in the consumption group containing 266 infants, five had developed a peanut allergy. George Du Toit et al., "Randomized trial of peanut consumption in infants at risk for peanut allergy," New England Journal of Medicine, 372 (2015), pp.…
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