1. Indicate whether each the following statements is true or false. Correct thefalse statement.a. A point estimate is a range of values used to estimate a population parameter(......).b. The critical values z and t if n =17 and the confidence level is 98% are2.17and 2.5669, respectively (......).c. The suggested formula for e in the following confidence interval estimate(pe,p+e)where p represents a sample proportion is e =p(1-p)n(......).

Given that A point estimate is a range of values used to estimate a population parameter

Answered: 1. Indicate whether each the following…

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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(c) An epidemiologist is worried about the ever increasing trend of malaria in a certain locality and wants to estimate the proportion of people infected in the peak malaria transmission period. If he takes a random sample of 150 people in that locality during the peak transmission period and finds that 60 of them are positive for malaria, find i. 99% confidence interval for the proportion of the whole infected people in that locality during the peak malaria transmission period.
3. In a random sample of 300 persons eating lunch at a Lexington pizzeria, 270 ordered pizza. a) Find and interpret a 95% confidence interval for the true proportion of people who eat pizza at this Lexington pizzeria? b) If we take 270/300 = 0.90 as an estimate of the corresponding true proportion, with what confidence can we assert that our error is less than 0.04?
In which of the following situations is it reasonable to use the procedure to obtain a confidence interval for the population mean? Assume that the population standard deviation is known. A. n = 10, the data contain no outliers, the variable under consideration is not normally distributed.B. n = 10, the variable under consideration is normally distributed.C. n = 18, the data contain no outliers, the variable under consideration is far from being normally distributed.D. n = 18, the data contain outliers, the variable under consideration is normally distributed.
Determine the point estimate of the population mean and margin of error for the confidence interval with lower bound of 18 and upper bound of 30 A. x=18, E=12 B. x=24, E=6 C. x=30, E=6 D. x=24, E=12
Consider a situation in which sampling without replacement is used to generate a random sample from each of two separate populations. To calculate a confidence interval to estimate the difference between population proportions, which of the following checks must be made? * A) Both populations must be approximately normal. B) The data from both samples must be unimodal, symmetrical, and approximately normal. C) Each population must be at least 10 times as large as its corresponding sample. D) Each sample proportion value must be less than or equal to 0.5. E) The sample sizes must be the same.
Which of the following would result in the widest confidence interval?a) A sample size of 100 with 90% confidence b) A sample size of 30 with 95% confidence. c) A sample size of 100 with 95% confidence d) A sample size of 100 with 99% confidence. e) A sample size of 30 with 90% confidence. f) A sample size of 30 with 99% confidence.
In which of the following situations is it reasonable to use the procedure to obtain a confidence interval for the population mean? Assume that the population standard deviation is known. A. n = 10, the variable under consideration appears to be normally distrubuited B. n = 10, the data contain no outliers, the variable under consideration is not normally distributed.C. n = 28, the data contain no outliers, the variable under consideration is far from being normally distributed.
1. The following is a sample of the percent increase in five growth funds over a one-year period. 8.9% 10.8% 13.7% 24.4% 9.8% The mean percent increase in this sample is: a. 13.5%. b. 14.2%. c. 12.2%. d. 11.8%. If the confidence level is deccreased from 90% to 88% for an SRS of size n, the width of the confidence interval for the mean will: a. decrease. b. stay the same. c. increase. d. The answer cannot be determined from the information given.
Refer to the following scenario. A government official is in charge of allocating social programs throughout the city of Vancouver. He will decide where these social outreach programs should be located based on the percentage of residents living below the poverty line in each region of the city. He takes a simple random sample of 124 people living in Gastown and finds that 20 have an annual income that is below the poverty line. Suppose that the government official wants to re-estimate the population proportion and wishes for his 90% confidence interval to have a margin of error no larger than 0.04. How large a sample should he take to achieve this? Please carry answers to at least six decimal places in intermediate steps, and use at least 3 decimal places in your critical value. Sample size =
A If n=21, ¯x (x-bar)=34, and s=8, construct a confidence interval at a 98% confidence level. Assume the data came from a normally distributed population. Give your answers to one decimal place.
Determine the point estimate of the population mean and margin of error for the confidence interval with lower bound of 15 and upper bound of 37. A. x=26, E=11 B.x=15, E=22 C.x=37, E=11 D.x= 26, E=22
. A researcher collects a sample of 24 measurements from a population and wishes to find a 99% confidence interval for the population mean. What value should he use for t*? b. If he instead decides to use a 95% confidence interval, will the interval be wider or be narrower or stay the same? Why?

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