A trainer wants to estimate the population mean training time for female runners within 2 minutes. Determine the minimum sample size required to construct a 99% confidence interval for the population mean training time of female runners. Assume the population standard deviation is 8.4 minutes. Write your answer in a complete sentence.

Q: In a random sample of 60​ computers, the mean repair cost was​ $150 and assume that the population…

A: Given: In a random sample of 60​ computers, the mean repair cost was​ $150  the population…

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

A: a.   The best estimate for the population mean credit card balance owned by the bank’s customers is…

Q: truct 98% confidence intervals for the a)population variance and the b)population standard d

A: s = 3.42 s2 = 11.7011.70 nn = 1414 The critical values for α=0.02 and df=13 degrees of…

Q: Calculate the margin of error for a 95% confidence interval for the population mean.

A: Given that the sample size is n = 32 Population SD = 5 At 95% confidence level, the critical value…

Q: Find the sample size required to develop an 86% confidence interval on a population proportion that…

A: Given information’s areConfidence interval = 86%Margin error = 5.5%Margin error = 0.055Proportion…

Q: If a school district takes a random sample of 63 Math SAT scores and finds that the average is 488,…

A: Given information Sample size (n) = 63 Sample mean x̅ = 488 Population standard deviation σ = 100…

Q: If the margin of error in an estimate for the mean weight of a shipment is + or -2 pounds at a…

A: From the provided information, The margin of error at a confidence level of 95 percent = ±2 The…

Q: Explain which would result in a wider large-sample confidence interval for : a 90%pconfidence level…

A: The z critical value for 95% confidence interval is 1.96 and the z-critical value for 90% confidence…

Q: Determine the margin of error for the confidence interval for the mean 68 < u < 85 The margin of…

A:

Q: If a school district takes a random sample of 53 Math SAT scores and finds that the average is 488,…

A: Given Information: Sample size n=53 Sample mean x¯=488 Population standard deviation σ=100

Q: Construct the confidence interval for the population mean.

A: Answer:

Q: Find the margin of error for the given confidence level.

A: Margin of error :  In a confidence interval, the range of values above and below the sample…

Q: Marvel Studio’s motion picture Guardians of the Galaxy opened over the first two daysof the 2014…

A:

Q: A college dean would like to estimate a population mean to within 40 units with 99% confidence given…

A: Given Data: Margin of error (ME)=40 Confidence level=0.99 Population standard deviation (σ)=200   a)…

Q: A company wants to know what proportion of their customers plan to repurchase their product in the…

A:

Q: Find the critical t value to use in making a 98% confidence interval for a mean if the sample size…

A:

Q: What is the confidence interval estimate for the population mean? If the sample mean is 13 and error…

A: Given information: The sample mean is, M = 13 The error bound for the mean is, E = 3.2 It is…

Q: is 10. Construct a 96% confidence interval to estimate the population mean. What is the point…

A: Here n = 37 N =200 X bar = 68

Q: We asked 101 people to report the number of cars they've ever owned. The results are a mean of 4 and…

A: Given data,n=101x=4σ=1z-value at 90% confidence is Zc=1.645

Q: Assume that all grade-point averages are to be standardized on a scale between 0 and 4. How many…

A:

Q: Determine the 99.5 percent confidence interval that contains the population variance if the sample…

A:

Q: The manager of a fast-food restaurant wishes to estimate the mean waiting time customers spend at…

A: It is given that the sample size is n=56. The sample mean waiting time is x¯=6.35. The sample…

Q: What is the margin of error for a 90% confidence interval?

A: It is given that Sample size n = 850 Number of residents support property tax, X = 410 The critical…

Q: igh school soccer league there are a total of 256 players.

A: Given that Total players in high school soccer league (n) = 256 players The mean height of the…

Q: The mean number of hours watching TV per week for a sample of 153 teenagers is 27. If the margin of…

A: Given,sample size(n)=153sample mean(x¯)=27margin of error(E)=1.2α=1-0.98=0.02α2=0.01Z0.01=2.33…

Q: Construct a 95% confidence interval of the population proportion using the given information.

A: The sample proportion is, p^=xn=240300=0.8 From the table of critical values, the critical value for…

Q: If a confidence interval for the mean is (31≤μ≤87) a) What is the point estimate?    b) What is…

A:

Q: From the data, identify the best point estimate of the population mean and 95% confidence interval…

A: We know that, The best point estimate of the population mean is sample mean .

Q: Calculate a two-sided 95% confidence interval for the population mean. b) In addition, predict the…

A: Given: The sample values given is as follows 24 28 27.75 27 24.25 23.5 26.25 24…

Q: if the margin of error for the population mean for 99% confidence level is 39, what is the standard…

A:

Q: The crWhat is the criti€cal value, zc , used for constructing a 96% confidence interval for a…

A: The confidence level is 96%. The level of significance is 0.04. The critical value is  Zc=2.054…

Q: Suppose a drug for stomach discomfort is tested on 75 subjects, and the mean time for it to take…

A: Given: Sample size n = 75 Sample mean X = 200 Population standard deviation σ = 30 Formula Used:…

Q: Imagine that a researcher appropriately conducts a z test and then calculates a correseponding 95%…

A:

Q: Suppose we would like to estimate the proportion of all NBA fans who thought Aaron Gordon won the…

A:

Q: Assume that all​ grade-point averages are to be standardized on a scale between 0 and   4. How…

A:

Q: Suppose a drug for stomach discomfort is tested on 50 subjects, and the mean time for it to take…

A: To find the confidence interval we will use z distribution because the population standard deviation…

Q: Find the critical t value to use in making an 80% confidence interval for a mean if the sample size…

A:

Q: To decide what personnel requirements should be enforced, a hospital manager wants to estimate the…

A:

Q: Find the Margin of Error, if we are asked for 90% confidence interval where the mean is 52.3, the…

A: The provided information are: Confidence level = 90% Population standard deviation (σ)=2.15 Sample…

Q: Determine the margin of error for the confidence interval for the mean: 61<µ< 86 The margin of error…

A: Solution: From the given information, the confidence interval for the mean is 61&lt;µ&lt;86. Then,…

Q: What is the minimum required sample size to make a 96% confidence interval for a population mean if…

A: Margin of error=E=2 Standard deviation=σ=12 96% confidence interval  E=Zc×σ/√n n=sample size

Q: Suppose the researcher decided to find 95% confidence interval for the mean working hours based on…

A: The level of significance may be defined as the probability of type I error which we are ready to…

Q: A transportation planner wishes to estimate the proportion of commuters who drive to work within…

A: There is no specific information about the value of p. Hence, we can consider p as 0.5. A…

Q: A 90% confidence interval for a population mean is (10, 20). What is the margin of error of the…

A: Given  alpha=0.10,  CI=(10,20)

Q: The 2006 General Social Survey contains information on the number of hours worked by a respondent…

A: Givenmean number of hours worked per week = 39.04standard deviation = 11.51sample size = 83The Z…

Q: (a) Calculate and interpret a 95% confidence interval for population mean cadence. (Ro

A: Given that sample size n = 20 Sample mean = 0.9270 Standard error of mean is SEmean = 0.0180 At 95%…

Q: If a school district takes a random sample of 61 Math SAT scores and finds that the average is 466,…

A: Find a 99% confidence interval for the mean math SAT score for this district.

Q: What is the smallest sample size that guarantees that the margin of error is less than 3% when…

A: