The effectiveness of a blood-pressure drug is being investigated. An experimenter finds that, onaverage, the reduction in systolic blood pressure is 72.1 for a sample of size 517 and standarddeviation 11.1.Estimate how much the drug will lower a typical patient's systolic blood pressure (using a 99%confidence level).Enter your answer as a tri-linear inequality accurate to one decimal place (because the samplestatistics are reported accurate to one decimal place).Answer should be obtained without any preliminary rounding. A shareholders' group is lodging a protest against your company. The shareholders group claimedthat the mean tenure for a chief exective office (CEO) was at least 8 years. A survey of 113companies reported in The Wall Street Journal found a sample mean tenure of 6.3 years for CEOSwith a standard deviation ofs =5.1 years (The Wall Street Journal, January 2, 2007). You don'tknow the population standard deviation but can assume it is normally distributed.You want to formulate and test a hypothesis that can be used to challenge the validity of the claimmade by the group, at a significance level of = 0.001. Your hypotheses are:Н.: д > 8Ha:µ < 8What is the test statistic for this sample?test statistic(Report answer accurate to 3 decimal places.)What is the p-value for this sample?p-value =(Report answer accurate to 4 decimal places.)The p-value is...less than (or equal to) agreater than aThis test statistic leads to a decision to...reject the nullaccept the nullO fail to reject the nullAs such, the final conclusion is that...

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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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Can you help me with the code for how to do this in R please? 1. The study "Digital Footprints" ([Pew Internet and American Life Project]("Digital Footprints" (Pew Internet and American Life Project)) reported that 47\% of Internet users have searched for information about themselves online. The 47\% figure was based on a random sample of Internet users. Suppose that the sample size was `n = 400`. i) Use this information to estimate the true proportion of Internet users who searched information about themselves using a default 95\% confidence interval. ii) Repeat (i) but instead use a 98\% Confidence Level. Use function `prop.test()`. iii) What is the main difference between the intervals computed in (i) and (ii)? What do you think is the role of the confidence level in determining the precision of the confidence interval estimate?
For this problem, carry at least four digits after the decimal in your calculations. Answers may vary slightly due to rounding. What percentage of your campus student body is female? Let p be the proportion of women students on your campus. (a) If no preliminary study is made to estimate p, how large a sample is needed to be 99% sure that a point estimate p^ will be within a distance of 0.07 from p? (Round your answer up to the nearest whole number.) | students (b) A report indicates that approximately 60% of college students are females. Answer part (a) using this estimate for p. (Round your answer up to the nearest whole number.) students
How many significant figures and/or decimal places to be used when reporting standard error?For example, the numbers are 21.22, 25.43, and 19.097.How many standard figures/decimal places should I use?
State the null hypothesis if traffic department wants to test whether the modification reduces the number of traffic accidents in Central. Continue from part a, state the corresponding alternative hypothesis of the test. Continue from part a, calculate the test statistics of the test. Continue from part c, what is the critical value of the test if the significant level is 1%? According to the test, is it reasonable to conclude that the modification reduced the number of traffic accidents?
Imagine that you are managing a hotel with 120 rooms. In order to track the occupancy rates you use 6 weeks trailing period. You just received information that 102 out of 120 rooms were occupied on Wednesday (10/16/13). Using updated information on the occupancy rates and the occupancy rates for the last 6 Wednesdays in Table 1, calculate the rolling average for Wednesdays. Table 1 Date Occupancy O 64% O 57% 82% O 61% 09/04/13 09/11/13 09/18/13 42.5% 55% 60% 09/25/13 10/02/13 10/09/13 45% 62.5% 77.5%
List the direct and indirect measures for alleviating multicollinearity.
Plz do fast
In constructing a control chart for the proportions of defective coins, a researcher calculates LCL to be 0.000025. What does "LCL" represent, and how should that value be adjusted? www Choose the correct answer below. OA. "LCL" represents the lower control limit. Since - 0.000025 is less than 0.05, this is an unusual LCL and the researcher should adjust the LCL to a value of - 1. OB. "LCL" represents the lower control limit. Since -0.000025 is less than 0 and proportions can never be less than zero, the researcher should adjust the LCL to a value of 0. OC. "LCL" represents the least common logarithm. Since - 0.000025 is less than 0.05, this is an unusual LCL and the researcher should adjust the LCL to a value of - 1. OD. "LCL" represents the least common logarithm. Since - 0.000025 is less than 0 and it is not possible to take the logarithm of a negative number, the researcher should adjust the LCL to a value of 0.
Modified True or False VIF values that exceed 10 are generally viewed as evidence of the existence of problematic errorterms
The Credit Risk Department of a major bank estimates the default rate on loans under $10,000 to be 4%. The bank will make 2400 loans that are under $10,000 next month. Find the mean of ^p, where ^p is the proportion of defaults on the 2400 loans under $10,000 to be made next month.
use table 13-1 to find what annual percentage rate was charged on meghans loan
what is the margin of error and how do we calculate it in the simplest forms and how do we find or estimate intervals that contains about 95% of the population or just in general?

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<µ< nswer should be obtained without any preliminary rounding.