uppose a national survey intends to identify the prevalence of Hepatitis C in a population of intravenous drug users. Out of a sample of 6,458 a total of 754 were confirmed to have the disease. Calcuate a SE using the plus-four method and construct a 99% confidence interval about the estimate

Q: Suppose the NCES would like to re-do their study. If they want a 95% confidence interval with a…

A:

Q: Controls 2.4 0.0 0.9 -0.2 1.0 1.7 2.9 -0.6 1.1 -0.1 0.3 1.2 -1.6 -0.1 -1.5 0.7 -0.4 2.2 -0.4 -0.4…

A: 1) The stem and leaf plot is Control   Breast-feeders   -8 3   -7 8,0   -6 8,8,5,5,2   -5…

Q: We are interested in estimating the average amount spent per customer for lunch in a restaurant in…

A: Confidence interval: It is defined as the range which contains the value of a true population…

Q: We take a sample of 50 people and obtain a sample mean of 147 pounds with a standard deviation of 15…

A: We have given that  Sample size n = 50 Sample mean = 147 Standard deviation = 15 90%confidence…

Q: A sample of 200 found that 43.2% of those sampled consumed more than 2 alcoholic  beverages  a week.…

A: Given:

Q: Of 127 randomly selected adults, 31 were found to have high blood pressure. Construct a 95%…

A: Given that, Of 127 randomly selected adults, 31 were found to have high blood pressure.  X = 31 N =…

Q: A poll of 827 students at Alpha state college found that 61% of those polled preferred a quarter…

A: It is given that the proportion of the students who preferred a quarter system to a trimester…

Q: sample standard deviation of $74.50. a. Develop a  95% confidence interval estimate of the mean…

A: The sample size, i.e., the sampled number of families, n=64.The sample average spent amount(in $)…

Q: In a sample of 40 water specimens taken from a construction site 26 contained detectable level of…

A: According to the provided information, sample size (N)=40 number of favorable cases (X) = 26 The…

Q: In a recent year, a sample of the South American Redeye Piranha was collected by fishermen on a…

A: We have to interprete data.

Q: Find the critical value Z a/2 for the 92% confidence interval.

A: We have given information, The confidence level is C=0.92. Here we have to obtain critical value of…

Q: A sample of 15 found that 43.2% of those sampled consumed more than 2 alcoholic  beverages  a week.…

A:

Q: A nutritionist believes that obesity is more prevalent among American adults than it was in the…

A: Hence we are given that; x1=380, n1=1630x2=726, n2=2350 Hence the sample proportions are;…

Q: Determine the sample size needed to create a 99%

A: Given that  Margin of error =E =0.05 The confidence level is 99%. The sample proportion can be taken…

Q: In a test of physical fitness, a fitness trainer for a group of men ages 65 and older from a local…

A: The population mean is known to be 20. Based on the sample evidence you have to test whether the…

Q: A survey conducted by the American Automobile Association (AAA) showed that a family of four spends…

A: Given that: Population mean, μ=215.60 n = 64 x¯=252.45 s = 74.50

Q: We plan to sample students to construct a 98% confidence interval for the proportion who uses Yelp…

A:

Q: Find the margin of error that corresponds to a sample of size 210 with 70% successes at a confidence…

A: Sample size is 210. Percentage of successes is 70%. Percentage of confidence level is 90%.

Q: mong 1815 randomly selected high school students surveyed by the Centers for Diseases Control, 300…

A: Given : Total number of high school students = 1815 Number of students said they were current…

Q: e) Find the critical value used to construct a 80% Confidence Interval for the mean. Only for this…

A: Solution: e. From the given information, the population standard deviation is σ=23.8 is known. The…

Q: Construct a 95% confidence interval for the proportion of all mechanically ventilated patients at…

A: From provided information, a study examined patients who were mechanically ventilated in intensive…

Q: A sample of 30 beams has an average strength of 1908.8 lbs. and s = 327.1. what is the 95%…

A:

Q: a 90 percent confidence interval for a population mean indicates that

A: Given problem Given that     a 90 percent confidence interval for a population mean indicates…

Q: You are working as an assistant to the dean of institutional research at your university. The dean…

A: The question is about confidence interval Given : Randomly selected no. of graduates ( n ) = 100…

Q: Find the critical value used for a 98% confidence interval for a proportion. Round to two decimal…

A: The confidence level is , C=98%=98/100=0.98 The level of significance is, For computing critical…

Q: A popular weight loss program claims users will lose weight each month. Linda samples 25 dieters and…

A: We have given that,  Sample mean (x̄) = 10 pounds, standard deviation (s) = 2 pounds and sample size…

Q: Find the critical value tc for a 90% confidence level when the sample size is 24. Use Table 4 on…

A: Given, n = 24 α = 0.1

Q: We are interested in estimating the average amount spent per customer for lunch in a restaurant at…

A:

Q: You are working as an assistant to the dean of institutional research at your university. The dean…

A:

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

A:

Q: Independent samples from two different populations yield the following data. x1=200,x2=963,…

A: Given  x1=200,x2=963, s1=19,s2=86 Find 90%CI for u1-u2

Q: company manufactures a certain over-the-counter drug. The company samples 80 pills and finds that…

A: We have given that  Sample size n = 80 Sample mean = 325.5 Standard deviation s=10.3 90%confidence…

Q: Find the value of ta/2 and n = 25 for the 90% confidence interval for the mean if the population…

A:

Q: Construct a 95% confidence interval for the population proportion of students who graduate within…

A: The sample size is n = 400 And the number of students who graduate within six years, X = 108 The…

Q: A survey conducted by the AAA showed that a family of four spends on average $215.60 per day while…

A: It is given that sample mean is 252.45 and the standard deviation is 74.50.

Q: Come up with  your own data for a problem that would ask for a 90% confidence interval utilizing Z.…

A:

Q: Find the critical value for a 94% confidence interval when the sample size is 51 and the population…

A: Given Level of significance ɑ=0.06 , n=51  Population standard deviations σ known

Q: Allen's hummingbird has been studied by zoologist Bill Alther. Suppose a small group of 16 Allen's…

A:

Q: Allen's hummingbird has been studied by zoologist Bill Alther. Suppose a small group of 15 Allen's…

A: Given,sample size(n)=15sample mean(x)=3.15standard deviation(σ)=0.22α=1-0.80=0.2α2=0.1Z0.1=1.2816

Q: n a trial of 350 patients who received 10-mg doses of a drug daily, 49 reported headache as a side…

A: 350 patients who received 10-mg doses of a drug daily; n=350 49 reported headache as a side effect;…

Q: the Pearson correlation coefficient (r) is ______and the slope of the regression line (b) is…

A: It is given asSSX = 100SSY = 120SP = 90

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.