article describes a study of 55 young adults with pierced tongues. The researchers found receding gums, which can lead to tooth loss, in 24 of the participants. (a) Construct a 95% confidence interval for the proportion of young adults with pierced tongues who have receding gums. (Use Table 3 in Appendix A. Give the answer to three decimal places.)   2) The formula used to calculate a confidence interval for the mean of a normal population when n is small is the following. x ± (t critical value)  What is the appropriate t critical value for each of the following confidence levels and sample sizes? (Round your answers to two decimal places.)   90% confidence, n = 11

Q: A 90% confidence interval estimate for a population mean is determined to be 72.8 to 79.6. If the…

A: We know that a (1-α)% confidence interval for the population mean is given by; x¯-zα2σn, x¯+zα2σn…

Q: 7. (Sec. 7.2) In a survey of 2004 American adults, 501 of them said that they believed in astrology…

A: Introduction:The 100 (1 – α) % confidence interval for the population proportion, π is: (p – (zα/2­)…

Q: Suppose you are told that a 95% confidence interval for the average price of a gallon of regular…

A: compute the sample mean and the maximal margin of error

Q: A trade magazine routinely checks the drive-through service times of fast-food restaurants. An 80%…

A: We have given that a trade magazine routinely checks the drive-through service times of fast-food…

Q: Calculate the​ 95% confidence intervals for the proportion of children​ surviving, and the…

A: Given information: Count = 711 Adult/Child Frequency Relative Frequency Adult 654 0.91983122…

Q: Suppose you are told that a 95% confidence interval for the average price of a gallon of regular…

A: Given confidence interval, Lower limit (LL)= 3.13 Upper limit (UL)=4.50

Q: Construct a 95% confidence interval for the proportion of adults from the East who say traffic…

A: n = 400 p = 0.34

Q: compute the sample mean and the maximal margin of error E. (Round your answers to two decimal…

A: It is given that The 95% confidence interval is CI = ( 3.50, 3.84 )

Q: Suppose we are interested to construct a confidence interval at 95% confidence level of the mean…

A: The provided information is  α=0.05 The critical value is  zc=1.96  (from standard normal table) The…

Q: Express the confidence interval mathematically. Do not round answers.

A: Let  be the population mean number of hours adults work each week.Given that,Sample size Sample mean…

Q: Suppose you are told that a 95% confidence interval for the average price of a gallon of regular…

A: To determine: Compute the sample mean and the maximal margin of error E. Given data: Suppose you are…

Q: A national organization conducted a survey of 1300 American adults and asked how many hours they…

A: sample mean()=40.5Margin of error(E)=0.8

Q: of residents in their tropical Researchers from a certain country were interested in how…

A: For male Mean=10.9 Standard deviations=0.9 Smaple size=93   For female Mean=10.3 Standard…

Q: An admission officer of a small liberal arts college wishes to compare the mean admission test…

A: Given: n1= 15 ,x̄1= 495.0 ,s1= 55.0 n2= 17 ,x̄2= 545.0 ,s2= 50.0 At 95.0 % confidence level with…

Q: The data below are yields for two different types of corn seed that were used on adjacent plots of…

A:

Q: Suppose you have a data set with 33 observations (n=30). What is the t-score for a confidence Level…

A: It is given that n=30 and confidence level is 0.90.

Q: A researcher is trying to estimate the population mean for a certain set of data. The sample mean is…

A:

Q: In a study of the infestation of a particular species of lobster by two types of barnacles, the body…

A: The sample mean and sample standard deviation can be calculated as;

Q: 9. The Centers for Disease Control and Prevention reported a survey of randomly selected Americans…

A:

Q: A random sample of monthly income yielded the data below. x¯=$2400s=$400n=131x¯=$2400s=$400n=131…

A: Solution: Given information: n= 131  Sample size x= $2400  Sample mean s = $400 Sample standard…

Q: The marketing director concluded, with 95% confidence, that between $113.36 and $130.64 contains the…

A: Given: Sample size,n=40Sample mean x¯=122Sample standard deviation s=27confidence level,c =95% =…

Q: . A sample of 84 WCC students found mean age 24.7 years old with standard deviation 7.9 years old.…

A:

Q: se you are told that a 95% confidence interval for the average price of a gallon of regular gasoline…

A: Given: Lower limit = 2.83 Upper limit = 3.86 The point estimate can be calculated as: Point estimate…

Q: Suppose you are told that a 95% confidence interval for the average price of a gallon of regular…

A: Suppose that µ is the population average price of a gallon of regular gasoline.

Q: A Statistics professor wanted to know how much time in a week his students study his course. He…

A: Given data, 180, 150, 300, 200, 60, 120, 90, 180, 60

Q: There is no difference(s) between an interval estimate and a confidence interval estimate. If true ,…

A: We can make only two types of estimates about the population. 1. Point estimate = A single value…

Q: Which type of confidence interval should you use in this situation? An economics professor randomly…

A: n=sample size=100, X¯=54.8,s=7.9

Q: Suppose you are told that a 95% confidence interval for the average price of a gallon of regular…

A: Given : 95% confidence interval for the average price of a gallon of regular gasoline in your state…

Q: Which type of confidence interval should you use in this situation? A sample of 6 adult elephants…

A: It is given that Mean = 12200Sample std. deviation = 200Sample size = 6Confidence level = 95%

Q: Suppose a sample of 779 tenth graders is drawn. Of the students sampled, 202 read at or below the…

A: In question, Given that a sample of 779 tenth graders is drawn. Of the students sampled, 202 read at…

Q: Marketing companies have collected data implying that teenage girls use more ringtones on their…

A: Given n1=n2=20 S1=1.5 S2=0.8

Q: ious example, you learned about a random sample of 60 Redeye Piranha. From that sample, a 99%…

A: a). We know that the formula of confidence interval of mean is as follows: CI=x¯±zsn, where x=sample…

Q: Suppose you are told that a 95% confidence interval for the average price of a gallon of regular…

A:

Q: You do a study of hypnotherapy to determine how effective it is in increasing the number of hours of…

A: The data shows the hours of sleep for 12 subjects.

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.