One study claimed that 86% of college students identify themselves as procrastinators. A professor believes that the claim regarding college students is too high. The professor conducts a simple random sample of 139 college students and finds that 110 of them identify themselves as procrastinators. Does this evidence support the professor’s claim that fewer than 86% of college students are procrastinators? Use a 0.05 level of significance. Step 3 of 3: Draw a conclusion and interpret the decision

Q: A study, which randomly surveyed 3,700 households and drew on this information from the IRS, found…

A: A​ study, which randomly surveyed 3,700 households and drew on this information from the​ IRS, found…

Q: When two births are randomly selected, the sample space for genders is bb, bg, gb, and gg. Assume…

A: The sample proportion is the number of girls divided by the number of individuals in the sample .…

Q: When two births are randomly selected, the sample space for genders is BB, BG, GB, and GG. Assume…

A: It is given that the sample space is {bb, bg, gb, gg}.

Q: An article estimated that 60 percent of students at a large public university who are Facebook users…

A: Let p = the proportion of college students who are Facebook users and log into their Facebook…

Q: In the twentieth century, it was a common practice in Southern California for houses to be built…

A: From the provided information,

Q: A student wants to see if the number of times a book has been checked out of the library in the past…

A: Given observation and calculation for correlation is shown below Number of times checked out(x)…

Q: Christina, a restaurant manager, would like to make the claim that the average number of customers…

A: Christina reject or fail to reject the null hypothesis is obtained below:From the information, the…

Q: Timothy, a javelin thrower, has a sample throw mean of 72.7 meters from 23 throws. Timothy still…

A: Given hypothesis test to check Timothy mean throw is greater than 65 meters.Ho : µ = 65H : µ >…

Q: Many people believe that criminals who plead guilty tend to get lighter sentences than those who are…

A: 1. Test statistic: From the given information,   Guilty Plea Not Guilty Plea Total Sent to…

Q: A random sample of n1 = 157 people ages 16 to 19 were taken from the island of Oahu, Hawaii, and 12…

A: Introduction: Denote p1, p2 as the true population proportions of high school dropouts of the two…

Q: A researcher surveys 50 individuals in the North Ward of Thunder Bay, and 40 in the South Ward, and…

A:

Q: Nancy, an economist, would like to make the claim that the average weekly grocery budget for…

A: Given that,  Z-test is applicable as the population standard deviation is known. The level of…

Q: A researcher surveyed randomly selected Democrats and Republicans asking them what the number one…

A: a. The test is check whether there is evidence to conclude that there is difference in what…

Q: A random sample of n1 = 158 people ages 16 to 19 were taken from the island of Oahu, Hawaii, and 11…

A:

Q: Jennifer, a golfer, has a sample driving distance mean of 244.0 yards from 16 drives. Jennifer still…

A:

Q: A travel agent claims that the average of the number of rooms in hotels in a large city is 500. At α…

A: It is given that the data for a random sample of seven hotels. The claim is that the average of the…

Q: Jacqueline, a medical researcher, would like to make the claim that a newly developed prescription…

A: Rejection rule:

Q: In a survey of working parents (both parents working), one of the questions asked was "Have you…

A: From the provided information,

Q: Annie is concerned over a report that a woman over the age of 40 has a better chance of being killed…

A: The hypothesis test is used to test whether the population parameter is equal to claimed value or…

Q: Many people believe that criminals who plead guilty tend to get lighter sentences than those who are…

A: The null hypothesis for testing is defined as, H0: The sentence (sent to prison or not sent to…

Q: In a survey of working parents (both parents working), one of the questions asked was "Have you…

A: According to the given information here we will use z test for proportion The null and alternative…

Q: Jacqueline, a medical researcher, would like to make the claim that a newly developed prescription…

A: Note:Hey there! Thank you for the question. As the graph attached with your question is in an image…

Q: A​ state-by-state survey found that the proportions of adults who are smokers in state A and state B…

A: Denote p1, p2 as the true population proportions of adult smokers in states A and B, respectively.

Q: A student wants to see if the number of times a book has been checked out of the library in the past…

A: The correlation coefficient: r=cov(x,y)σxσy=∑i=115(x-x¯)(y-y¯)/nσxσy=538.20*53.1=0.1217 The equation…

Q: A veterinarian is interested in researching the proportion of men and women cat owners and believes…

A: Preliminary: a. A random sample of 60 men and another random sample of 80 women are considered. In…

Q: Many people believe that criminals who plead guilty tend to get lighter sentences than those who are…

A: For the given data, the chi-square test for the association is appropriate. H0​: The sentence​ (sent…

Q: The American Library Association claims that at most 67% of library patrons actually borrow books.…

A:

Q: In the twentieth century, it was a common practice in Southern California for houses to be built…

A: From the provided information,

Q: A researcher in the field of educational psychology is interested in the effects an open classroom…

A: Z Score CalculationsZ = (M - μ) / √(σ2 / n)Z = (86 - 82) / √(5 / 49)Z = 4 / 0.31944Z = 12.52198

Q: A random sample of n1 = 157 people ages 16 to 19 were taken from the island of Oahu, Hawaii, and 12…

A:

Q: In a random sample of missions flown by B-17’s, 38 returned and 24 were lost. In a random sample of…

A: Statistical hypothesis testing is an important method in inferential statistics. It is used to test…

Q: In the twentieth century, it was a common practice in Southern California for houses to be built…

A: a)   Denote p1, p2 as the proportions of all Southern California twentieth century houses and all…

Q: When a person states at the outset of an experiment that a higher average score will be received by…

A: Given that :  The higher average score will be recevied by a group receiving some kind of treatment…

Q: What test would I run in excel? A clinical trial is conducted to compare a new pain re- liever for…

A: Use chi square 2*2 contingency table test

Q: Rachel, a city employee, would like to make the claim that the average amount that residents spend…

A: Q1)  |Test - stats| < Critical value    P-value = P( Z < -0.52)

Q: A college professor suspects that students at his school are getting less than 8 hours of sleep a…

A:

Q: Kenneth, a competitor in cup stacking, claims that his average stacking time is 8.2 seconds. During…

A: Note:The given calculated values can be used to draw the conclusion.

Q: Is the proportion of wildfires caused by humans in the south different from the proportion of…

A: Given : x1= 350.0 n1= 519 x2= 383.0 n2= 500 significance level, 0.01

Q: Many people believe that criminals who plead guilty tend to get lighter sentences than those who are…

A:

Q: A national organization that conducts research on the cost and quality of health care in the U.S.…

A: A national organization that conducts research on the cost and quality of health care in the U.S.…

Q: Many people believe that criminals who plead guilt tend to get lighter sentences than those who are…

A: The observed values are

Q: dults aged 18 years old and older were randomly selected for a survey on obesity. Adults are…

A: Let p1 denote the proportion of southern women who are obese and p2 denote the proportion of…

Q: Two competitive investment fund managers devised a plan to determine which one is better at picking…

A: Given that The proportion of stock picked by manager 1 is p1=0.66 And the proportion of stock picked…

Q: A researcher surveys 50 individuals in the North Ward of Thunder Bay, and 40 in the South Ward, and…

A: Given, n1=50 n2=407 p^1=40%=0.40 p^2=30%=0.30 α=0.10 x1=n1*p1=50*0.40=20x2=n2*p2=40*0.30=12

Q: practice in Southern California for houses to be built with pools in the backyard. For new homes,…

A: Given Level of significance ɑ=0.05 Hypothesis Ho: p1=p2 vs H1: p1>p2 (claim)( right tailed) Test…

Q: Nancy, an economist, would like to make the claim that the average weekly grocery budget for…

A: From the given information, it can be observed the test statistic is –0.75.

Q: When two births are randomly selected, the sample space for genders is bb, bg, gb, and gg. Assume…

A: When two births are randomly selected, the sample space for genders is bb, bg, gb, and gg. Assume…

Q: An immunologist is testing the hypothesis that the current flu vaccine is less than 71​%…

A: In hypothesis we want to conclude that whether there is significant evidence or not of the statement…

2-Proportion Test

In a 2-proportion test, two separate proportions are measured at the same time, and their similarity is evaluated. It is also known as a 2-proportion z-test, and a comparison of two different proportions is done in this method.