Q7 You wish to test the following claim (Ha) at a significance level of a=0.002 Ho: μ-53.6 На: »53.6 You believe the population is normally distributed, but you do not know the standard deviation. You obtain a sample of size n=91 with mean M=54.2 and a standard deviation of SD=11.2 What is the test statistic for this sample? (Report answer accurate to three decimal places.) test statistic = What is the p-value for this sample? (Report answer accurate to four decimal places.) p-value =

Q7 You wish to test the following claim (Ha) at a significance level of a=0.002 Ho: μ-53.6 На: »53.6 You believe the population is normally distributed, but you do not know the standard deviation. You obtain a sample of size n=91 with mean M=54.2 and a standard deviation of SD=11.2 What is the test statistic for this sample? (Report answer accurate to three decimal places.) test statistic = What is the p-value for this sample? (Report answer accurate to four decimal places.) p-value =

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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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Suppose that shoe sizes of American women have a bell-shaped distribution with a mean of 8.12 and a standard deviation of 1.53 Using the empirical rule, what percentage of American women have shoe sizes that are less than 9.65? Please do not round your answer.
The Cardiac Care Network in Ontario, Canada, wants to determine whether the wait for by- pass surgery is longer than the wait for angiography. A sample of 539 bypass patients waited, on average, 19 days with standard deviation 10 days; a sample of 847 angiography patients waited, on average, 18 days with standard deviation 9 days. What kind of a test should CCN perform? z-interval to estimate the difference in two proportions t-interval to estimate the difference in two means Chi-square test for association t-test for the difference in two means z-test for the difference in two proportions ANOVA
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Aspirin is packed in 150 tab bottles with weight normally distributed with mean 750g and standard deviation 8g. Rejected bottles are those whose weight differs from the mean weight by 18g or more. That is, rejected bottles have weight either too small or too large. We want to find out how many bottles will be rejected from a daily production of 10,000 bottles. 1)Do we have to calculate one z-score or two z-scores? 2)The negative z-score is _____ ( rounded to two decimal digits) 3)The positive z-score is ______ (rounded to two decimal digits) 4)The sketch of the normal curve that describes the question is graph looks like what? 5)How many bottles, of the 10000, do we anticipate to reject?
Experimental components for use in aircraft engines were tested to destruction under extreme conditions. The survival times, in days, of ten components were tested. The mean survival time was determined to be 445.5 days with a standard deviation of 120 days. The experimental components manufactured by the company report that the mean survival time is 430 days. Is there a significant difference between the sample and the claim? Evaluated on a TI 83 calculator
To compare customer satisfaction levels of two competing cable television companies, two samples are selected. The first sample selected from company one consist of 174 customers with mean 3.51 and standard deviation 0.51. And from company two 355 customers were selected with mean 3.24 and standard deviation 0.52 . From the above data can the researcher prove that the customers prefer first company at most the second company at α = 0.02 ? What the tabulated value value What the calculated value What the Decision
The National Center for Health Statistics reports that the mean systolic blood pressure for males 35 to 44 years of age is 128 with a standard deviation of 15. In a sample of 72 CSLA male faculty members in this age group a nursing faculty member found an average systolic blood pressure of 126. (1) State the null and alternative hypotheses for this study (2) What is the dependent and independent variable for this study (3) What test statistic/hypothesis test would you select to determine if the means are significantly difference at the alpha .05 level? (4) What critical value would you use to make your decision to reject or retain the null hypothesis at alpha .05?
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Suppose researchers wish to determine if the mean birth weight of infants in 1961 is significantly lower than the historical average, 121121 ounces. Suppose the population standard deviation of birth weights is equal to 1919 ounces. Use software to calculate the sample mean (?⎯⎯⎯x¯) for these data. Then, conduct a one‑sample ?z‑test to test the researchers' hypothesis at the ?=0.05α=0.05 level. What are the standard error (SE), the ?z‑statistic, and the ?z‑critical value for this test? Please round all answers to the nearest three decimal places. Sample mean 119.81.