Aston’s Career Service wants to find out what proportion of Aston’s students work in a part-time job. A similar survey undertaken 3 years ago found that 60% of Aston students worked in a part-time job. How many students must it include in the sample if it wants to achieve a ±4% accuracy at a 95% confidence level?

Q: Isabel Myers was a pioneer in the study of personality types. According to one of her surveys, in a…

A: Solution

Q: In a 2017 survey was conducted on what was the best day of the week.  The result indicated that 90%…

A: Margin of error is given by, And Confidence interval for this study,

Q: Several years ago, 44% of parents who had children in grades K-12 were satisfied with the quality of…

A: The claim is that 44% of parents who had children in grades K-12 were satisfied with the quality of…

Q: Why does increasing the confidence level result in a larger margin of error?

A: We know that the Margin of error is directly proportional to the test statistic's critical value,…

Q: A survey conducted on a certain website indicated that 52.9% of the people visiting this website…

A:

Q: Several years ago, 36% of parents who had children in grades K-12 were satisfied with the quality of…

A:

Q: When you construct a 95% confidence interval, what are you 95% confident about?

A: Confidence intervals: Confidence intervals are the limits for the point estimate of population…

Q: You suspect minority students are not as supportive of the new principal of a large school because…

A: given n1=56, x1=45 n2=33, x2=21

Q: For EACH of the 2 majors, consider the 'School Type' column. Construct a 90% confidence interval for…

A: Confidence Interval: The form of the confidence interval is, CI = Point estimate ± Margin of error…

Q: The American Heart Association is about to conduct an anti-smoking campaign and wants to know the…

A: Given that, The sample size, n=1421 There are 454 peoples who smoke. x=454 The sample proportion is…

Q: 88% of California adults (444 out of 506 surveyed) feel that education is one of the top issues…

A: The value of z at a 90% confidence level is 1.645, which can be obtained by using the standard…

Q: As Senior Class President, one of your lifelong duties is overseeing the planning of your high…

A:

Q: Several years ago, 39% of parents who had children in grades K-12 were satisfied with the quality of…

A: From the provided information, 39% of parents who had children in grades K-12 were satisfied with…

Q: A survey conducted on a certain website indicated that 49.3% of the people visiting this website…

A: Given that, the proportion of peoples visiting a website who considers red color is irritating is…

Q: Dr. Jean discovered a new treatment for skin disease. She believes that the new treatment is more…

A: Given Data: p^1=0.7333    n2=30p^2=0.75    n2=100   pooled value of proportion:…

Q: A principal of a large high school wants to estimate the true proportion of high school students who…

A: Given information- Sample size, n = 50 For a random sample of 50 students, the 95% confidence…

Q: A researcher wanted to check whether the percentage of Canadian adults with obesity has decreased in…

A: Number of Canadian adults in 2005= 75 Number of Canadian adults in 2009 = 120   significance level =…

Q: cording to a report in USAToday, more and more parents are helping ndom sample of 40 young adults…

A: The formula to construct confidence interval is, p^±Zα/2*p^(1-p^)n The formula for margin of error…

Q: A telephone poll of 1,000 adult Americans was reported in an issue of a news magazine. One of the…

A: A telephone poll of 1,000 adult Americans was reported in an issue of a news magazine. One of the…

Q: How much more sensitive to contrast are athletes with eye grease than without eye grease? Give a 95%…

A:

Q: A recent poll indicated that 42% of men supported raises taxes to fund additional park services.…

A:

Q: You are interested in studying whether students living in the dorms or students living off campus…

A: given information : n1=35,n2=50m1=5.7, m2=6.3s1=1.4 ,s2=1.3 for obtain 99% confidence interval first…

Q: Several years ago, 43% of parents who had children in grades K-12 were satisfied with the quality of…

A: Given  Several years ago, 43% of parents who had children in grades K-12 were satisfied with the…

Q: According to a poll, 89% of California adults (450 out of 506 surveyed) feel that education is one…

A: Find a 90% confidence interval for the population proportion.

Q: Construct a 95% confidence interval estimate. How does this change your answer to (b)?

A: (d)

Q: Cough and Headache At the 98% confidence level, should be nurse inform the managers that their…

A: The number of sampled patients that complained of cough and headache, n=230.The number of patients…

Q: Several years ago, 44% of parents who had children in grades K-12 were satisfied with the quality of…

A: We have given that 44% of parents who had children in grades K-12 were satisfied with the quality of…

Q: Several years ago, 46% of parents who had children in grades K-12 were satisfied with the quality of…

A: Given information Population proportion p = 0.46 We have given that; a recent poll asked 1,045…

Q: A survey conducted on a certain website indicated that 44.9% of the people visiting this website…

A: Given: proportion of people visiting website=44.9% margin of error=5%

Q: You are going to construct a 99% confidence interval for the proportion of hip replacement…

A:

Q: A statistics instructor was interested in the proportion of all Kent State students who live on…

A: The proportion that students at Kent State live on campus is obtained below:From the given…

Q: Several years  ago, 41 % of parents who had children in grades  K-12 were satisfied with the quality…

A: Given,n=1175x=477p^=xnp^=4771175=0.4061-p^=1-0.406=0.594α=1-0.90=0.1α2=0.05Z0.05=1.645

Q: A survey commissioned by the Southern Cross Healthcare Group reported that 16% of New Zealanders…

A: 1.Suppose p is the true population proportion of people, who consume five or more servings of drinks…

Q: A study was being done to estimate the proportion of students who receive financial aid. If the…

A:

Q: What would answer be at 99% confidence interval?

A: We have given that,  Sample proportion (p̂) = 64% = 0.64 and sample size (n) = 550 Then,  We will…

Q: Several years ago, 39% of parents who had children in grades K-12 were satisfied with the quality of…

A:

Q: What is the effect on the size of the confidence interval if a T score is used instead of a Z score?…

A: The formula for calculating confidence interval using Z score is as follow:

Q: Several years ago, 43% of parents who had children in grades K-12 were satisfied with the quality of…

A:

Q: If there was a 95% confidence interval of say, (0.48, 0.68), about a product being preferred by…

A: The confidence interval at 100 (1 – α) % confidence level gives us an interval estimate about the…

Q: Several years ago, 46% of parents who had children in grades K-12 were satisfied with the quality of…

A: Given  p=0.46, n=1055, X=488

Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.