Dr. Dream, an expert in infectious diseases, wanted to estimate the proportion of the adult population in the U.S. that received a flu vaccine. They randomly sample 866 individuals and 388 of them received a flu vaccine. They decide to report a 90% confidence interval for the population proportion. c. Compute the 90% confidence interval

Q: The formula P %3D n + 4 is describing the [Select ] method for calculating an approximate confidence…

A: Solution: X=no of successes  n=no of experiments  To find approximate confidence interval for a…

Q: 4. The World Health Organization reports that in a sample of 10,013 people globally, 9 in 31 people…

A: We know, we calculate CI for a single proportion with the formula z*=1.96 for 95%          1.645 for…

Q: When a survey asked subjects whether they would be willing to accept cuts in their standard of…

A: It is given that 362 out of 1,180 subjects respond yes.The sample proportion is 362/1,180 =…

Q: Of 118 randomly selected adults, 34 were found to have high blood pressure. Construct a 95%…

A: According to the given information, we have Total number of adults = 118 34 were found to have high…

Q: In a study of 200 accidents that required treatment in an emergency room, 80 occurred at work. Find…

A: Obtain the 90% confidence interval for the true proportion of accidents that occurred at work. The…

Q: In order to estimate the proportion of entering students who graduate within six years, the…

A: Solution: Let X be the number of students who graduate within six years and n be the sample number…

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

A:

Q: The production manager in an automobile plant is concerned with the number of cars that do not pass…

A:

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: What is the t-value for a 95% confidence interval given that the sample size is 16? Write the exact…

A: Given: confidence level =95%  Sample size n=16  Then degree of freedom for t-test is =n-1  To find…

Q: A telephone company has the business objective of wanting to estimate the proportion of households…

A:

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: In an article in Marketing Science, Silk and Berndt investigate the output of advertising agencies.…

A: Givenx=115n=390p^=xn=115390=0.2949confidence interval = 90%

Q: In a 2009 Gallup Poll, 441 of 507 adults said it was “morally wrong” to clone humans. Assume Gallup…

A:

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: It was observed that 30 of the 100 randomly selected students smoked. Find the confidence interval…

A: It is given that, 30 out of 100 randomly selected students smoked i.e. proportion of the student who…

Q: What value of z should be used to calculate a confidence interval with a 95% confidence level?

A: The z value which is used to calculate 95% confidence interval is defined as P(-zvalue < Z <…

Q: Suppose that a safety group surveyed 800 drivers. Among those​ surveyed, 83​% said that careless or…

A: Given Information :  Suppose that a safety group surveyed 800 drivers. Among those​ surveyed, 83​%…

Q: Identify the y-score for a 99% confidence interval if the sample size is 35.

A: We have to find critical value for given data..

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

A:

Q: If n=200 and ˆpp^ (p-hat) =0.39, find the margin of error at a 99% confidence level

A: Find z-critical value:…

Q: An investigator computes a 95% confidence interval for a population mean on the basis of a sample of…

A: To find half of width, We need to calculate 4 times the sample Size.

Q: If n=150 and ˆpp^ (p-hat) =0.25, find the margin of error at a 90% confidence level

A: n = 150p^ = 0.2590% confidence level

Q: A regional survey of 561 companies asked the vice president of operations how satisfied he or she was…

A:

Q: In a random sample of 184 college students, 97 had part-time jobs. Find the margin of error for the…

A: Given : Sample Size, n = 184 Number of successes, x = 97 confidence level,c=0.99

Q: In a certain high school, 7 out of 11 juniors said that they planned to go to the winter prom.…

A:

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

A:

Q: 1. A recent survey showed that from a sample of 500 packages delivered by a Postal Service, 480 were…

A: We have given that  Sample size n= 500 , favorable cases x=480 Sample proportion p^=x/n=…

Q: An economist at the Florida Department of Labor and Employment needs to estimate the unemployment…

A: Given

Q: find tc for a 95% confidence level when the sample size is 6.

A: level of significance, alpha = 0.05from standard normal table, two tailed t alpha/2 with n-1 = 6 d.f…

Q: identify the population proportion, the value of margin of error E, and construct the confidence…

A:

Q: Identify the t- scores for a 99% confidence interval if the sample size is 70?

A: We have to find critical value.

Q: Provide an explanation as to why it would be very unlikely that a different sample of size n=30…

A: Given: n=30

Q: Identify the at-score for a 99% confidence interval if the sample size is 70.

A: givensample size(n)=70α=1-0.99=0.01

Q: (d) Use the combined data of 80 students, construct a 95% confidence interval estimate of the…

A: Given that  Total students=n=40+40=80 Number of pass students=X=28+32=60

Q: What is the t-value for a 90% confidence interval given that the sample size is 26? Write the exact…

A:

Q: 2. Estimate the proportion of WCU students who have type B blood using 95% confidence interval.…

A: Solution: From the given information, X=24 and n=100.

Q: The owner of the Gas station wishes to determine the proportion of customers who use credit card. he…

A:

Q: The z value for a 96.6% confidence interval estimate is?

A: z value for a 96.6% confidence interval estimate is?

Q: A recent survey of 1,000 people found that 90% of Americans support background checks for purchasing…

A:

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: An economist at the Florida Department of Labor and Employment needs to estimate the unemployment…

A: Givenp^=0.46sample size(n)=529

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: Identify the y-score for a95% confidence interval if the sample size is 50.

A: The confidence level is 0.95.

Q: If n=420 and ˆpp^ (p-hat) =0.19, find the margin of error at a 95% confidence level

A:

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

A:

Q: A statistics student wants to conduct a study to determine the proportion of workers in Cititon who…

A:

Q: In a survey of 900 adults, 240 said that they watched the World Cup final on television. Using these…

A: Given, The sample proportion is,

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.