A sample of 256 managers reveals a sample mean of $45,420. The standard deviation of the sample is $2,050. What is the range of values for the population mean at 95% confidence level?

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: In a survey, the planning value for the population proportion is  p* = 0.33.  How large a sample…

A: It is given that the population proportion is 0.33.It is known that the critical value for 95%…

Q: Find the sample size need to find the Population Mean if the margin of error is $105, the confidence…

A: Solution: From the given information, confidence level is 0.95, σ=315 and E=105.

Q: If we want to provide a 95% confidence interval for the mean of a population when the population…

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Q: In a survey, the planning value for the population proportion is p*=0.25 . How large a sample should…

A: Sample size: The sample size for a desired confidence level, α with a given margin of error, E is…

Q: Which of the following is thet-value for a 95% confidence level when the sample size is 20. O a.…

A:

Q: #7. On the verbal section of the SAT, the standard deviation is known to be 100. What size sample…

A: Introduction: The 100 (1 – α) % confidence interval for the population mean, μ, when the population…

Q: The General Social Survey asked: “How many e-mails do you send in a day?” The results of 928…

A: Given information Sample size n = 928 Mean x̅ = 10.4 Standard deviation s = 28.5 Since significance…

Q: In a situation where the sample size was decreased from 39 to 29 in a normally distributed data set,…

A: Confidence interval formula is given by

Q: In a survey, the planning value for the population proportion is p* = 0.25. How large sample should…

A: Given information Error = 0.09 Population proportion = 0.25 Confidence level = 0.95

Q: When alpha is set to 0.01 what is the confidence level ? answer choices : 0.01 0.02 0.98 0.99

A: From the provided information, Level of significance (α) = 0.01

Q: a recent study of 100 people in Burlingame found that 19 were obese.  Find the 90% confidence…

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Q: If a confidence interval for the mean is (34≤μ≤86)(34≤μ≤86), a) What is the point estimate?    b)…

A: (a) The point estimate is 60, which is obtained below: Point estimate=Upper limit+lower…

Q: Which of the following would result in the narrowest confidence interval? A. 80% confidence level…

A: The narrowest confidence interval will result from larger sample size and a smaller confidence…

Q: In a survey, the planning value for the population proportion is . How large a sample should be…

A: Let, Proportion =p Margin of error=E CI is =Zc n=?

Q: Use the given degree of confidence and sample data to construct a confidence interval for the…

A: Given Information n =87 x =48

Q: In a survey, the planning value for the population proportion is p* =0.25 . How large a sample…

A: Given: p* = 0.25α=0.05MOE=0.09

Q: A sample of 64 was taken from a population, with the mean of the sample being 25 and the standard…

A: It is given that  Sample mean = 25 Sample standard deviation = 2 Sample size = 64 Confidence level =…

Q: A researcher calculates a 90% confidence interval of (0.24,0.4) for a proportion. What was the…

A: Given :confidence level = 90% confidence interval = (0.24,0.4) p is unknown, so p=0.5 We want to…

Q: A bank wishes to estimate the mean credit card balance owed by its customers. The population…

A: Determine the number of customers needs to be sampled. The number of customers needs to be sampled…

Q: The statistics department is interested in estimating the proportion of students who have majored in…

A: Here we need to find the required sample size to estimate the proportion of students who majored…

Q: In a survey, the planning value for the population proportion is p* = 0.25. How large a sample…

A:

Q: If the alpha level is .05, then the confidence level is ?

A: Given: alpha = 0.05 confidence level / significant level = 1 - alpha

Q: In a survey, the planning value for the population proportion is .25. How large a sample should be…

A: We have to find sample size..

Q: Use the given degree of confidence and sample data to construct a confidence interval for the…

A: It is given that n=195 and x=162. The sample proportion is 162/195 = 0.8308 The sample size is 195…

Q: A sample of 49 managers reveals a sample mean of $45,420. The standard deviation of the sample is…

A:

Q: A sample of 49 managers reveals a sample mean of $45,420. The standard deviation of the sample is…

A: Given: n=49, x=45420 and s=2050. Use z test and the value of z at 95% confidence interval is 1.96.

Q: In a survey, the planning value for the population proportion is p* 0.16. How large a sample should…

A: Obtain the sample size of a preliminary estimate for p is 0.16 with the 90% confidence.   The…

Q: Find the confidence level and a for an 88% confidence interval.

A: Here use confidence level and significance level as alternative of each other

Q: 3. In a sample of 300 people, 154 said that they watched news on television. Find the 90% confidence…

A: Given : Sample size of people (n) = 300 Let X : No. of people from sample  who said they watched…

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

A: Solution: From the given information, the sample proportion is 18% and a margin of error is 4…

Q: use the given degree of confidence and sample date to contruct a confidence interval for the…

A: Sample size = n = 124 Sample number of events = x = 20 Sample proportion = p̂ = x/n = (20/124) =…

Q: An economist is interested in studying the incomes of consumers in a particular country. The…

A: The population standard deviation = $1,000.Z value for 90% confidence interval is 1.645.Sample size…

Q: If X̅ = 65, ? = 20 ??? ? = 36, construct a 95% confidence interval estimate for the population mean,…

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Q: Construct a confidence interval for the population proportion p. n ? 144, x ? 86, 90% confidence

A: Given: Confidence level = 0.90 Sample size (n) = 144 x = 86 Sample proportion p^=xn=86144

Q: 300 high school students were asked how many hours.of TV they watch per day. The mean was 2 hours,…

A: Given that: Mean=2 Standard deviation=SD=σ= 0.5 Confidence level= 90% n=sample size=n=300   So…

Q: If a confidence interval for the mean is (41≤μ≤84)(41≤μ≤84), a) What is the point estimate?    b)…

A: a) What is the point estimate?

Q: If a confidence interval for the mean is (38≤μ≤89)(38≤μ≤89), a) What is the point estimate?    b)…

A: Given,   Lower bound = 38​ Upper bound = 89

Q: In a survey, the planning value for the population proportion is p* = 0.25. How large a sample…

A: Given : Population proportion (p*) = 0.25 Confidence level = 95% So ; significance level (α) =…

Q: In a survey, the planning value for the population proportion is p* = 0.25. How large a sample…

A: Given,sample proportion(p*)=0.25margin of error(E)=0.08α=1-0.95=0.05α2=0.025Z0.025=1.96   (from…

Q: In a survey of 1037 US adults ages 65 and over, 643 were concerned about getting the flu. A 99%…

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Q: If you obtained one thousand 95% confidence intervals for a population mean, μ, roughly how many of…

A: A 95% confidence interval means that if we take 100 different samples and determine a 95% confidence…

Q: Using your answers to parts (a) and (b), find a 95% confidence interval estimating the proportion of…

A: Here we need to construct a 95% confidence interval.

Q: Use the given degree of confidence and sample data to construct a confidence interval for the…

A: Given data, n=195 x=126 p=x/n=126/195=0.646   z-value at 95% confidence is Zc=1.96

Q: The manager of a car company will select a random sample of its customers to create a 90 percent…

A: From the provided information, Confidence level = 90% Margin of error = 0.06

Q: Example : In the group of 345 children surveyed, the sample mean was 11.3 and the standard deviation…

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Q: Which confidence level will produce the widest confidence interval, given a sample proportion of…

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Q: Among various ethnic groups, the standard deviation of heights is known to be approximately three…

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Q: on the data she gathers. Which one of the following combinations of sample size and confidence level…

A: here AS PER GUIDELINES I HAVE CALCULATED FIRST MAIN QUESTION , AS YOU HAVE POSTED MULTIPLE DIFFRENT…