Suppose the U.S. president wants an estimate of the proportion of the population whosupport his current policy toward revisions in the health care system. The presidentwants the estimate to be within 0.03 of the true proportion. Assume a 90% level ofconfidence. The president's political advisors estimated the proportion supporting thecurrent policy to be 0.65. (Use z Distribution Table.)a.How large of a sample is required? (Round the z-values to 2 decimal places. Roundup your answer to the next whole number.)Sampleb. How large of a sample would be necessary if no estimate were available for theproportion supporting current policy? (Round the z-values to 2 decimal places.Round up your answer to the next whole number.)Sample

(a) The formula of sample size is, Procedure for finding the z-value is listed below: From the…

Answered: Suppose the U.S. president wants an…

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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4. Suppose that 15% of all students at your school ride a bicycle to class each day. Suppose further that you take a random sample of 80 students at your school. a. Is 15% number a parameter or a statistic? Explain briefly. b. Are you guaranteed that 15% of your sample ride a bicycle to class each day? Explain briefly. c. Describe the sampling distribution of the sample proportion of these 80 students who ride a bicycle to class each day. (Hint: Be sure to refer to the shape, center, and spread of this sampling distribution.) Also include a well- labeled sketch of this distribution. HCL SYstem
The number of Starbucks coffee shops in cities within 20 miles of theUniversity of California, Riverside is shown in the following table. See Attachment a. Draw a dotplot to describe the data.b. Describe the shape of the distribution.c. Is there another variable that you could measure that might help to explain why some cities have more Starbucks than others? Explain.
Statistics Question
Which region has the largest population in this sample? What proportion live in that region? Which region/province has the least people? What is the percentage? How many in the sample were from the Prairies?
b) The margin of error for the proportion of all adults who think things are on the wrong track for 90% confidence is 0.039. Would the margin of error be larger or smaller for 95% confidence? Explain. Choose the correct answer below. A. To be more confident, the interval needs to contain the true proportion more often, so the margin of error would be smaller. B. To be more confident, the interval needs to contain the true proportion more often, so the margin of error would be larger. O C. To be more confident, the interval needs to contain the true proportion less often, so the margin of error would be smaller. D. To be more confident, the interval needs to contain the true proportion less often, so the margin of error would be larger.
A researcher wants to determine the percentage of American teenagers who send or receive text messages while doing homework. Which of the following techniques would likely be the MOST efficient way of obtaining an accurate estimate for this percentage? 1. Randomly select teenagers from the list of all teenage students in every state in America and mail surveys to those teens, asking them if they send or receive text messages while doing homework. 2. Send a survey to every teenager in America and ask them if they send or receive text messages while doing homework. 3. Randomly select teenagers from the list of all teenage students in one state and mail surveys to those teens, asking them if they send or receive text messages while doing homework.
When a researcher changes their data analyses to get the p-value they desire, that is known as a. HARKing b. p-hacking c. multiple comparisons d. a Type II error
a5
The brand manager for a brand of toothpaste must plan a campaign designed to increase brand recognition. He wants to first determine the percentage of adults who have heard of the brand. How many adults must he survey in order to be 95% confident that his estimate is within five percentage points of the true population percentage? Complete parts (a) through (c) below. Question content area bottom Part 1 a) Assume that nothing is known about the percentage of adults who have heard of the brand. n=enter your response here (Round up to the nearest integer.)
A programmer plans to develop a new software system. In planning for the operating system that he will use, he needs to estimate the percentage of computers that use a new operating system. How many computers must be surveyed in order to be 99% confident that his estimate is in error by no more than three percentage points? Complete parts (a) through (c) below. Question content area bottom Part 1 a) Assume that nothing is known about the percentage of computers with new operating systems. n=enter your response here (Round up to the nearest integer.) Part 2 b) Assume that a recent survey suggests that about 90% of computers use a new operating system. n=enter your response here (Round up to the nearest integer.) Part 3
What is an outlier? O No answer text provided. O No answer text provided. O A number that is extraordinarily large or small as compared with the rest of the data set. O The middle number in a data set. A number within the middle 50% of the data. O A person that lies outside.
Suppose that we want to estimate what proportion of gift items purchased at a department store are returned for a refund, and that we want to be "at least 95% sure" that the error of our estimate will be less than 0.05. How large a sample will we need if a. we have no idea what the true proportion might be? b. we know that the true proportion is between 0.01 and 0.20?

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