375 students at a university, 315 stated that they were nonsmokers. Based on this sample, compute a 95% confidence interval for the proportion of all students at the university who are nonsmokers. Then find the lower limit and upper limit of the 95%

Q: Use the Student's t distribution to find t, for a 0.95 confidence level when the sample is 27.

A: sample size=n=27 Degree of Freedom=n-1=27-1 =26 Confidence level is 0.95 Therefore the Level of…

Q: Suppose that 95% of the bags of certain fertilizer mix weigh between 49 and 53 pounds. Averages of…

A: The central limit theorem studies the nature of the sampling distribution of the sample mean when…

Q: 3. needed to estimate the percentage of adults who can touch their nose with Find the sample size…

A:

Q: A health researcher computed 90%, 95%, 98%, and 99% confidence intervals for the proportion of…

A: Given that a health researcher computed 90%, 95%, 98%, and 99% confidence intervals for the…

Q: values that mark the boundaries of the confidence interval. Select one: a. Confidence limits b.…

A: The boundaries of the confidence interval are the upper limit and the lower limits of that…

Q: The audobon society recently estimated top speeds of peregrine falcons and found a 95% confidence…

A: Given: The 95% confidence interval for the average top speed in miles per hour of the species is…

Q: find the z-number associated with a 92% level of confidence. find the z-number associated with a…

A:

Q: For a sampling distribution of n = 500 and population proportion of 0.48 of those who prefer cookies…

A:

Q: You are interested in finding a 98% confidence interval for the average commute that non-residential…

A: b. Using EXCEL function, “=AVERAGE(A1:A10)”, and “=STDEV.S(A1:A10)”, the values of sample mean and…

Q: Find the margin of error and confidence interval for the percentage of U.S. adults who regularly use…

A:

Q: Solve the problem. The following confidence interval is obtained for a population proportion, p:…

A: Given  Confidence interval for a population proportion p is (0.318,0.569) Using these Confidence…

Q: Use the given data to construct a confidence interval for the population proportion p of the…

A: It is given that sample size (n) is 70  and x is 50.

Q: A statistics practitioner took a random sample of 48 observations from a population whose standard…

A: sample size(n)=48 population standard deviation(σ)=25 Mean(x)=105

Q: want 95% confidence that your error is no more than 0.035.   The sample should include men and…

A:

Q: A poll of 2657 U.S. adults found that 86% regularly used Facebook as a news source. Find the margin…

A: Given that, n = 2657 Point estimate = sample proportion =  = 0.86 1 -  = 1 - 0.86 = 0.14

Q: Construct the confidence interval for the population mean . C=0.98, x=15.3, = 10.0, and n=75

A: The Confidence Interval formula is X  ±  Z s √(n) Where: X is the mean Z is the Z-value…

Q: Thirty randomly selected students took the calculus final. If the sample mean was 95 and the…

A: From the provided information,

Q: Find the margin of error for each data from certain populations. 3. 45, 56, 61, 88, 91, 64, 38, 79,…

A: Given data: Confidence leval = 90% To find margin of error

Q: In a survey of 400 UAE residents, 72 said they trust cryptocurrencies. Find the Lower Confidence…

A:

Q: atistics practitioner took a random sample of 49 observations from a population whose standard…

A: Sample size n =49 Sample mean=103 Population standard deviation =25

Q: In a survey of 2009 adults in a recent year, 1263 say they have made a New Year's resolution.…

A:

Q: Which of the following decreases the margin of error for a confidence interval? Decreasing the…

A: given data we want to decrease margin of error for a confidence interval.

Q: The population mean of a set of data is unknown. The sample mean is 32, and the error bound for the…

A: Given data,  x¯=32 EBM = 8

Q: A new fertilizer was applied to the soil of 218 bean plants. 27% showed increased growth. Find the…

A: Given Information: Sample size (n) = 218 Proportion p^= 27% = 0.27 To find the margin of error and…

Q: Suppose you survey a random sample from a large population to understand the population proportion.…

A: Obtain the sample size of a no preliminary estimate for p. The formula of sample size is, Obtain…

Q: Which of the following Z values would you use to calculate the 95% confidence interval? 1.28 1.96…

A:

Q: Find a Confidence interval for the true Population Proportions if n = 30,        x = 75, and the…

A: From the given information, X=75 and n=30.

Q: Which one of the following statements about confidence intervals is false?   Given the same sample…

A: In this case, we need to identify the false statement for confidence interval.

Q: A new fertilizer was applied to the soil of 136 bean plants. 87% showed increased growth. Find the…

A: The number of bean plants, n=136 The increased growth is 87%. i.e. p^=0.87 The confidence interval…

Q: Assume that the population has a normal distribution. Thirty randomly selected students took the…

A:

Q: Translate the statement into a confidence interval. Approximate the level of confidence. In a survey…

A: The confidence interval proportion is obtained below: From the given information, the proportion…

Q: A poll of 2612 U.S. adults found that 15% regularly used Facebook as a news source. Find the margin…

A: The margin of error is defined as MOEγ=zγ×σn,γ is the confidence level,σ is the sample standard…

Q: A poll of 2368 U.S. adults found that 40% regularly used Facebook as a news source. Find the margin…

A: Solution: From the given information, n=2368, p-hat = 40%. The confidence level is 0.90.

Q: statistics practitioner took a random sample of 48 observations from a population whose standard…

A: We have given that  Sample mean =100 Population standard deviation =23 Sample size n =48

Q: If 330, 610] is a confidence interval for the population mean. Find the value of the point estimator…

A: The confidence interval for population mean is given by (330, 610) Let M be the sample mean and E be…

Q: Use the given data to construct a confidence interval of the requested level. x = 98, n = 223,…

A: Given information: x=98, n=223Confidence level=99% p^=xn=98223=0.4395 α2=1-0.992=0.005 Use the excel…

Q: Find the sample size need to find the Population Proportion if the margin of error is 4%, the…

A:

Q: a. Assume that nothing is known about the percentage to be estimated. n= 1068 (Round up to the…

A:

Q: If [0.64, 0.82] is a confidence interval for the population proporlion. Find the value of the point…

A:

Q: Calculate the margin of error of a confidence interval for the difference between two population…

A:

Q: Determine the margin of error for the confidence interval for the mean: 23 +1.7 The margin of error…

A: Confidence Interval is an inference process that is used to estimate the population parameter. The…

Q: A survey asked, "How many tattoos do you currently have on your body?" Of the 1233 males surveyed,…

A: We have given that, For the males:- X1 = 183 and n1 = 1233 For the females :- X2 = 139 and n2 = 1042…