A study was being done to estimate the proportion of students who receive financial aid. If the study would like to construct 90% confidence interval for the proportion of students receiving financial aid within 2%, what sample size would be needed? A previous study stated that 53% of students receive some form of financial aid.

Q: A June 2020 Angus Reid poll of 1510 Canadian adults found that 53% support the idea of a 30 hour…

A: Given Data: p^=0.53n=1510   z-value corresponding to 95% Confidence level=1.96

Q: (a) What is the rat's sample proportion p? What is the large-sample 95% confidence interval for p?…

A: Given: Population size, n = 80 Sample size, x = 80 Sample proportion, p^: p^=8080=1

Q: what would be the 90% confidence interval of the true proportion of young adults who have received…

A: Given that sample size is n = 190 And the sample proportion is 70% = 0.7 At 90% confidence level,…

Q: What is the relationship between confidence intervals and hypothesis testing? When testing Ho: μ =…

A: Given: Confidence interval=90% Level of significance, a= 1-0.90=0.10

Q: What is meant by saying that a 1-a confidence interval is a. exact?b. approximately correct?

A: a.Confidence Interval:Confidence interval is the interval estimate of the population parameter. It…

Q: In a recent Dew Research Poll, 500 U.S. adults were asked about their online versus in-store clothes…

A:

Q: Suppose in a recent poll of 1250 randomly selected Californians who took vacations, 132 of them…

A:

Q: We would like to know: "What percentage of college students drink alcohol every day?" In a random…

A: Given that, N=500 X=75

Q: Generally speaking, what is the difference between a confidence interval and a prediction

A:

Q: Is the difference between the two indicators significant at the 95% confidence level?

A:

Q: In a study of 120 randomly selected families, 50 said they streamed their television content. Find…

A:

Q: If a 0.10 significance level is to be used to test the claim that  p 1 less thanp 2​, what…

A: Provided that the level of significance is α=0.10.  Let p1 and p2 denote the population proportion…

Q: What is the impact on the confidence interval estimate if a larger sample is used?

A: Confidence interval:

Q: A Gallup Youth Survey in 2001 found that of 501 randomly selected teenagers in the U.S., 271 of them…

A: Given Total number of teenagers selected = 501Number of teenagers said who get along with their…

Q: In a survey with human resources managers, 71% of respondents thought they should hire new staff…

A: Given information: Denote the population proportion of all respondents who thought that they should…

Q: What is the effect of sample size on the width of a confidence interval?

A: If the sample size is increased, then the corresponding margin of error is decreased. Hence, the…

Q: A political candidate has asked you to conduct a poll to determine what percentage of people support…

A: Solution:There is no estimates available, hence the sample proportion is assumed to be 0.50.The…

Q: 1. A poll of 2,500 people shows that 50% approve of a smoking ban in bars and restaurants. What is…

A:

Q: In the 2004 presidential election, exit polls from the critical state of Ohio provided the following…

A: There are two independent samples which are Bush and Kerry. The sample size for both samples is…

Q: Seventy-three percent of a sample of 1000 students drive a used car as opposed to a new car or no…

A: Given: Proportion  = 73 % Confidence level  = 80 %

Q: Professor Smith loves dark chocolate, and she would like to find out the proportion of the…

A: Given Information: Sample size (n) = 850 Out of which x = 600 people chose dark chocolate.…

Q: In a recent polI, 200 people were asked if they liked dogs, and 15% said they did. Find the margin…

A: From the provided information, Sample size (n) = 200 15% people said they like dogs that is p̂ =…

Q: The following table shows the results of a survey in which 1017 adults from the United States, 1060…

A: (1)

Q: in a random sample of 800 austin automobile owners, it was found that 480 would like to see the size…

A: We have to find given ci.

Q: A researcher asks 600 people if they received a flu vaccine, and 65% said they did. What is the 95%…

A: From the provided information Sample size (n) = 600 65% said they received a flu vaccine that is…

Q: (a) If researchers decide on a 4.2% margin of error for a 95% confidence interval. What sample size…

A: From provided information, Sample proportion is (p̂) = 50% i.e. 0.5 The sample size can be…

Q: In a sample of 1901 patients who underwent a certain type of surgery, 22% experienced complications.…

A:

Q: Suppose you constructed a 90% confidence interval for the true average GPA of California community…

A: Solution: 1. From the given information, 90% and 80% confidence interval for the true average GPA of…

Q: Why is a 99% confidence interval wider than a 95% confidence interval?

A: The confidence interval formula is sample statistic±Margin of error. The margin of error is the…

Q: What is the difference between a prediction interval and a confidence​ interval? And when is it…

A: Confidence Interval :  Confidence intervals tell you how well you have determined a parameter of…

Q: We plan to sample parents in order to construct a 99% confidence interval for the proportion who…

A:

Q: n our Condor Cafe, the Oxnard College Culinary Program offers the most delicious and affordable…

A: Given that, n=255,x=75

Q: If he wants to limit the margin of error of his 98% confidence interval to 3%, what is the minimum…

A:

Q: Suppose you are designing a survey of firework plans among Kansas residents. You would like for the…

A: Here we need to find the required sample size with a 95% confidence level to estimate the number of…

Q: Suppose you want to construct an 80% confidence interval for the proportion of businesses that…

A: Given:Margin of Error (E)=3.5%=0.035   For Confidence level 80%, the significance level (α) is…

Q: The Pizza Shop wanted to determine what of its customers ordered an only cheese pizza. Out of 90…

A:

Q: Consider the following research question, which will be answered using the data collected from the…

A: For the given sentence, We have to tell what type of inference procedure would best. In sentence…

Q: Suppose a 90 percent confidence interval to estimate a population proportion was calculated from a…

A: The confidence interval for proportion can be calculated as follows:

Q: What is the relationship between confidence intervals and hypothesis tests?

A: Confidence Interval:Confidence interval is the interval estimate of the population parameter. It is…

Q: At one large college, 660 out of the 1500 students surveyed said they plan to take another science…

A: Given that,   x=660,n=1500 The sample proportion is, Critical values: By using the standard normal…

Q: A political candidate has asked you to conduct a poll to determine what percentage of people support…

A: The formula for the sample size is as follows:

Q: An airline transports over 10 000 passengers daily, and the airline is curious what proportion of…

A: Critical value: Using Excel formula "=NORM.S.INV(1-(0.1/2))", the z-value is obtained as 1.645.

Q: If a retailer would like to estimate the proportion of their customers who bought an item after…

A: Solution: 3. From the given information, confidence level is 0.90 and E=0.03.

Q: According to a poll taken in a certain​ country, when adults were asked whether they were​ thriving,…

A: Sample size (n) = 439 240 of them said that they were struggling that is x = 240. The sample…

Q: ays before the 2016 presidential election, a Loras College poll asked 500 randomly selected likely…

A: The confidence interval indicate that true proportion of voters who favor Donald Trump is 43% which…

Q: It was found that in a sample of 90 teenage boys, 70% of them have received speeding tickets. What…

A: Given data ,n=90P=70%=0.7The z-value at 90% confidence is1.645=z∝12=1.645

Q: In a study by Sallie Mae and Gallup, 323 of the 569respondents said that they paid for their…

A:

Q: What would be the standard error in computing a confidence interval for the difference of…

A: It is given that For population 1, sample size n1 = 49, sample proportion = 0.682 For population 2,…

Types of Bias

Statistics is the study of data collection, organization, analysis, interpretation, and presentation. Statistical bias is a characteristic of a statistical technique or its findings in which the expected value deviates from the actual root quantitative parameter being estimated. According to the actual definition of bias, it refers to the tendency of a statistic to overestimate or underestimate a parameter.