Suppose you are studying deliveries made by a shipping company. Suppose you find that 86% ofthis company's deliveries are made on time. Further suppose each delivery is independent. Finallysuppose that you are studying a sample of 15 deliveries from this company.(a) What is the chance that exactly 11 of these deliveries are made on time?(b) What is the chance that less than 14 of these deliveries are made on time?For parts (c)/(d) suppose you are now studying a sample of 950 deliveries from this company.(c) Show why it is appropriate to approximate this situation with a normal random variable.(d) Using the normal distribution, what is the chance that more than 800 of these 950deliveries are made on time?

The specified proportion of the time, deliveries are made on time, .The sampled no. of deliveries,…

Answered: Suppose you are studying deliveries…

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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Is the national crime rate really going down? Some sociologists say yes! They say that the reason for the decline in crime rates in the 1980s and 1990s is demographics. It seems that the population is aging, and older people commit fewer crimes. According to the FBI and the Justice Department, 70% of all arrests are of males aged 15 to 34 years†. Suppose you are a sociologist in Rock Springs, Wyoming, and a random sample of police files showed that of 34 arrests last month, 23 were of males aged 15 to 34 years. Use a 5% level of significance to test the claim that the population proportion of such arrests in Rock Springs is different from 70%. What is the level of significance? ____ What is the value of the sample test statistic? (Round your answer to two decimal places.) _____ Find the P-value of the test statistic. (Round your answer to four decimal places. ______
Question 2 If A and B are events from a sample space such that Pr(A) = 0.6, Pr(B) = 0.3 and Pr(A U B) = 0.7, then Pr(A n B') is equal to А. О.12 В. О.18 С. 0.2 D. 0.3 Е. О.4
According to a study conducted by a statistical organization, the proportion of people who are satisfied with the way things are going in their lives is 0.78.Suppose that a random sample of 100 people is obtained. Complete parts (a) through (e) below.
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A researcher studying public opinion of proposed Social Security changes obtains a simple random sample of 25 adult Americans and asks them whether or not support the proposed changes . To say that the distribution of the sample proportion of adults who respond yes, is approximately normal , how many more adult Americans does the researcher need to sample in the following cases? (a) 15% of all adult Americans support the changes (b) 20% of all adult Americans support the changes
A researcher studying public opinion of proposed Social Security changes obtains a simple random sample of 25 adult Americans and asks them whether or not they support the proposed changes. To say that the distribution of the sample proportion of adults who respond yes, is approximately normal, how many more adult Americans does the researcher need to sample in the following cases? (a) 20% of all adult Americans support the changes(b) 25% of all adult Americans support the changes(a) The researcher must ask _____more American adults. (Round up to the nearest integer.)
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