respond favorably to a new advertisement than the people in the western part of her country. She randomly selects 100 people from each of these parts of her country. She finds that 80 people in the eastern part of the country respond favorably, while only 60 people in the western part do. Julia wants to use these results to construct 95% confidence interval to estimate the difference in the proportion of all people who would respond favorably in these parts of her country (eastern−western). Assume that all of the conditions for inference have been met. Which of the following is a correct 95% confidence interval based on Julia's samples?

Q: An employee claims that 20% of the email she receives is personal, 60% is work related, and 20% is…

A: Given data An employee claims that 20% of the email she receives is personal 60% is work related and…

Q: In a survey, 37% of the respondents stated that they talk to their pets on the telephone. A…

A: Statistical tests are used to calculate the test statistics which is eventually used to determine…

Q: A psychologist was interested in the effects of time of day on critical thinking. Participants were…

A: Solution: It is given that a psychologist was interested in the effects of time of day on critical…

Q: researcher selects a sample from a population with a mean of m = 40 and administers a treatment to…

A: We have to find correct null hypothesis..

Q: The Department of Transportation reports that out of all fatal crashes, 6% of the drivers were…

A: Given,n=345x=25p^=xnp^=25345=0.0725α=0.05

Q: A real estate broker’s newsletter says the average price of a house in a metropolitan area is…

A:

Q: Suppose a recent survey found that 74% of dog owners say their pet appears cheerful, while only 59%…

A: Given, p^1=0.74p^2=0.59

Q: A statistics professor wants to see if more than 80% of her students enjoyed her class. At the end…

A: Power of a hypothesis test is defined as probability of rejecting the null hypothesis when the…

Q: Sacramento City College administrators claim that the retention of first-time students at the…

A: Consider that p1, p2 is the true proportions of retention of first-time students at the college in…

Q: n general, if sample data are such that the null hypothesis is rejected at the ? = 1% level of…

A: α = 1% or 0.01   ___________________________    P-value (One Tailed ) = P-value (2 Tailed)2

Q: A decade-old study found that the proportion, p, of high school seniors who believed that "getting…

A:

Q: In conducting a significance test, is it easier or harder to reject the null hypothesis when the…

A: Decision rule :Reject Null hypothesis if z statistic > zα/2 critical value at α level of…

Q: The average U.S. household has $235,600 in life insurance. A local insurance agent would like to see…

A:

Q: A researcher records the number of words recalled by students presented with a list of words for one…

A: The degrees of freedom is 48.

Q: Please help me only for the p-value on part (c), thank you!

A: (C)From the given information,Null and alternative hypothesis is,H0 : P=0.10Ha : p>0.10The…

Q: Pete is a politician. He claims that 34% of the households in his district have total household…

A: We want to find p value Hypothesis  Ho: p=0.34 vs H1: p≠0.34 (two tailed) Z=0.1335

Q: About 10% of the human population Is left-handed. Suppose a researcher speculates that artists are…

A: Solution: n= 150 Sample size of artist  x= 18 artist are left handed  p^=xn=18150=0.12  Sample…

Q: A hospital director is told that 32%of the emergency room visitors are uninsured. The director wants…

A:

Q: 2. In a 2009 nonscientific poll on the Web site of the Daily Gazette of Schenectady, New York,…

A: Given, X=615 n=1200 α=0.01 Therefore, the predicted proportion of all adult Americans who are less…

Q: A psychologist specializing in marriage counseling claims that, among all married couples, the…

A:

Q: In a random sample of 80 Americans, 55% wished that they were rich.  In a random sample of 100…

A: Given : p1 = 0.55p2 = 0.48n1 = 80n2 = 100 p1 = x1n10.55 = x180x1 = 44 p2 = x2n20.48 = x2100x2 = 48

Q: A random sample of 100 students at a high school was asked whether they would ask their father or…

A: There are two independent samples which are follows normal distribution. The number of successes,…

Q: A dog enthusiast wanted to see if there was a difference in pit-bull ownership between people in…

A: Given Information :  A dog enthusiast obtained a list of registered dog owners from the city of…

Q: A certain university claims that for the last school year the proportion of students who were not…

A: Given that  Claim : The proportion of students who were not able to earn a college diploma is at…

Q: 11 students enterin the College of Computing with a B average had lost their HOPE scholarship by the…

A: p1 = 73/137 = 0.5328 p2 = 72/111 =0.6486 n1 = 137n2 = 111

Q: researcher records the number of words recalled by students presented with a list of words for one…

A: To test the between the two groups the hypothesis of interest is     H0: μ1=μ2     Ha: μ1≠μ2 Under…

Q: An exercise science student believes that during professional rugby games the average distance…

A: Provided that : When reviewing game statistics the student found that the average distance covered…

Q: A healthcare provider saw that 48% of their members received their flu shot in a recent year. The…

A: Solution   p be the population proportion

Q: 2. The average U.S. household has $235,600 in life insurance. A local insurance agent would like to…

A: Population mean = ? = 235600 Sample S.D = s =25500 Sample size = n =30 Sample mean = x̅ =…

Q: Answer the following problem. Suppose a six-sided die is rolled. Let the amount of dot on each side…

A: Each die has 6 faces numbered 1 to 6. Then, following the given assumptions- POSSIBLE OUTCOMES IN…

Q: Suppose we want to test the null hypothesis H0 : p = 0.34 against the alternative hypothesis H1 : p…

A: Solution Given hypothesis H0 : p = 0.34 against H1 : p < 0.34 Sample=x=120 N = 300 P(cap) =…

Q: USA Today reported that about 47% of the general consumer population in the United States is loyal…

A: We have given that the hypothetical proportion p0=0.47, sample size 1002 and favourable cases X =…

Q: Two schools are investigating whether there is a difference in the proportion of students who attend…

A:

Q: In a survey, 37% of the respondents stated that they talk to their pets on the telephone. A…

A: Given: x = 54n=160p^=xn=54160=0.3375α=0.01 The test hypothesis are, H0: p = 0.37 H1: p < 0.37.…

Q: In a fishing lodge brochure, the lodge advertises that 75% of its guests catch northern plke over 20…

A: a) Denote p as the true proportion of guests who catch pike over 20 pounds.

Q: A local school board wants to estimate the difference in the proportion of households with…

A: To construct the confidence interval about difference in two proportions, we must use z –…

Q: If a simple random sample of size 34 was collected, the following hypotheses tests will have the…

A: Correct answer is H0: μ=42  and H1: μ≠42

Q: 2.The Gallup organization periodically polls adults living in the U.S. about the issue of…

A:

Q: Consider the first sample to be the sample of occupants not wearing seat belts and the second sample…

A: To conclude the claim of indifference between the "proportion of occupants killed wearing the seat…

Q: What is the z-value for a two-sided hypothesis test on a population mean when a=.05?   1. 1.645…

A:

Q: USA Today reported that about 47% of the general consumer population in the United States is loyal…

A: "Hi! Thank you for the question! Since the question contains four subparts and we are allowed to…

Q: Brett is a huge sports fan. He hypothesized half of sports fans liked football the best, 25% liked…

A: HERE GIVEN HYPOTHESIZED PROPORTION OF PEOPLE LIKE BASKETBALL = 0.15 = P NO OF PEOPLE SURVEYED = N =…

Q: Which is the correct answer? and why?  A researcher selects a sample from a population with a mean…

A: The given sample mean is 49. After the treatment is administered, the scores are expected to…

Q: If alpha is .10 in a two-tail hypothesis test, what is your decision rule for rejecting a null that…

A: The z-test statistic for the population mean is Z=x¯-μ0σnwhere x¯=sample mean…

Q: Would you favor spending more federal tax money on the arts? Of a random sample of n, = 208 women,…

A: Given: n1=208r1=69n2=172r2=63α=0.05Thus, we…

Q: A decade-old study found that the proportion of high school seniors who felt that "getting rich" was…

A: In this context, it is given that the proportion of high school seniors who felt that “getting rich”…

Q: The coach of a basketball team thinks the referee is using a weighted coin to decide which team gets…

A: 1)   Assume that pi’s are the proportion of the heads and tails, respectively. For all i = 1, 2.

Q: Select the appropriate null and alternative hypothesis for the following research question: Does a…

A: Given Solution:

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.