Researchers at a reputable university and a reputable health organization claim that approximately 76% of people believe "tranquilizers work very well to make a person more calm and relaxed." Of the next 80 people interviewed, what is the probability that (a) at least 54 are of this opinion? (b) at most 62 are of this opinion? Click here to view page 1 of the standard normal distribution table. Click here to view page 2 of the standard normal distribution table. (a) The probability is (Round to four decimal places as needed.)

Researchers at a reputable university and a reputable health organization claim that approximately 76% of people believe "tranquilizers work very well to make a person more calm and relaxed." Of the next 80 people interviewed, what is the probability that (a) at least 54 are of this opinion? (b) at most 62 are of this opinion? Click here to view page 1 of the standard normal distribution table. Click here to view page 2 of the standard normal distribution table. (a) The probability is (Round to four decimal places as needed.)

A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

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The average starting salary of individuals with a master's degree in statistics is normally distributed with a mean of $53.400 and a standard deviation of $6,000. What is the probability that a randomly selected individual with a master's in statistics will get a starting salary of at least $62,200? Multiple Cholce 0.048 0.071 0.429 0.941
In a study to estimate the proportion of residents in a certain city and its suburbs who favor the construction of a nuclear power plant, it is found that 77 of 125 urban residents favor the construction while only 56 of 100 suburban residents are in favor. Is there a significant difference between the proportions of urban and suburban residents who favor construction of the nuclear plant? Make use of a P-value. Click here to view page 1 of the standard normal distribution table. Click here to view page 2 of the standard normal distribution table. Let urban residents correspond to population 1, let suburban residents correspond to population 2, and let a success be a resident who favors the construction of a nuclear power plant. Identify the null and alternative hypotheses. OA. Ho: P₁ P2 H₁: P₁ P2 D. Ho: P₁ P2 H₁: P₁ = P2 Find the test statistic. B. Ho: P₁ = P2 H₁: P₁ P2 E. Ho: P₁ = P2 H₁: P₁ P₂ (Round to two decimal places as needed.) C. Ho: P₁ P2 H₁: P₁ = P2 OF. Ho: P1 P2 H₁: P₁ = P2
In a poll, 51% of the people polled answered yes to the question "Are you in favor of the death penalty for a person convicted of murder?" The margin of error in the poll was 2%, and the estimate was made with 94% confidence. At least how many people were surveyed? Click here to view the standard normal distribution table (page 1). Click here to view the standard normal distribution table (page 2). The minimum number of surveyed people was (Round up to the nearest integer.)
Rent for two-bedroom apartments in Davis, CA, follow a normal distribution with mean of $2,200 and standard deviation of $300. A random sample of 36 two-bedroom homes results in a mean $2,075. What is the probability that the sample mean is greater than or equal to $2,075?
In a survey of 1007 adults, a polling agency asked, "When you retire, do you think you will have enough money to live comfortably or not. Of the 1007 surveyed, 525 stated that they were worried about having enough money to live comfortably in retirement. Construct a 90% confidence interval for the proportion of adults who are worried about having enough money to live comfortably in retirement. Click here to view the standard normal distribution table (page 1). Click here to view the standard normal distribution table (page 2). Click here to view the table of critical t-values. Click here to view the table of critical values of the chi-square distribution. Select the correct choice below and fill in the answer boxes to complete your choice. (Use ascending order. Round to three decimal places as needed.) O A. There is 90% confidence that the true proportion of worried adults is between and B. 90% of the population lies in the interval between and. C. There is a 90% probability that the…
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According to a study, the proportion of people who are satisfied with the way things are going in their lives is 0.80. Suppose that a random sample of 100 people is obtained.
In a recent poll, 45% of survey respondents said that, if they only had one child, they would prefer the child to be a boy. Suppose you conducted a survey of 160 randomly selected students on your campus and find that 79 of them would prefer a boy. Complete parts (a) and (b) below. Click here to view the standard normal distribution table (page 1). LOADING... Click here to view the standard normal distribution table (page 2). LOADING... (a) Use the normal approximation to the binomial to approximate the probability that, in a random sample of 160 students, at least 79 would prefer a boy, assuming the true percentage is 45%. The probability that at least 79 students would prefer a boy is 3636. (Round to four decimal places as needed.)