The airport is planning the budget for the following year and needs to estimate the cost for security.  Over the course of a 30 day month (n=30) the man hours needed is roughly 350 with a mean of 10 hours a day and a standard deviation of .4 hours. Construct a 90% and 95% confidence interval? Interpret the confidence interval in your own words. What would happen to the confidence interval if you used a 99% interval?

Q: If n = 100 and p (p-hat) = 0.9, construct a 95% confidence %3D interval. Give your answers to three…

A: Givensample size(n)=100p^=0.9α=1-0.95=0.05α2=0.025zc=zα2=z0.025=1.96   (from z table)

Q: A psychiatrist is interested in finding a 95% confidence interval for the tics per hour exhibited by…

A:

Q: If n = 15, 43, and s = 9, construct a confidence interval at a 98 % confidence level. Assume the…

A:

Q: Consider a sample of 100 people and subsequently a confidence interval calculated from the sample.…

A: The formula for calculating confidence interval is as follow:

Q: Students at Green River plans a study to stats Test scores. Previous research has shown the…

A: We have given that  Margin of error =E =0.5 Population Standard deviation = 1 99%confidence…

Q: An important factor in selling a residential property is the number of people who look through the…

A: Since the sample size is small and population standard deviation is unknown, t distribution can be…

Q: A person surveyed his Youtube chat and asked how many pages of manga of Demon Slayer they have seen.…

A: The mean number of episodes was 304 episodes. The confidence interval for the population mean is,…

Q: Suppose that the a college wants to have an idea of the average SAT score of the incoming freshman…

A: The confidence level is 0.90, the standard deviation is 310 and margin of error E is 50.

Q: You have a sample of 9 men and a sample of 8 women. The degrees of freedom for the t value in your…

A:

Q: Part A: Make a 90% confidence interval for given that you have a sample of size 49 which produced a…

A: Given,margin of error(E)=0.2standard error(σ)=3.2α=1-0.90=0.10α2=0.05Z0.05=1.645      (from Z-table)

Q: Environmental Health Much discussion has taken place concerning possible health hazards from…

A:

Q: How much more likely are college men than college women to participate in intramural sports?  A…

A: Given information: Number of college men surveyed, n1=688 Number of college women surveyed, n2=579…

Q: Construct a 95% confidence interval for the mean time to prepare a tax return. In the next…

A:

Q: What is the impact of changing from the 95% confidence interval to the 90% confidence interval? The…

A: Confidence Interval Confidence Interval refers to the range of the value that we expect our estimate…

Q: A study by researchers at a university addressed the question of whether the mean body temperature…

A: Given that, A study by researchers at a university addressed the question of whether the mean body…

Q: one with a 95% confidence level and the other with a 99.7% confidence level. Which interval is…

A: Confidence interval is probability, which refers that population parameter will fall within set of…

Q: A sample of 700 from population A has a proportion of interest of 0.24 while a sample of 600 from…

A: Confidence Interval: The form of the confidence interval is, CI = Point estimate ± Margin of error…

Q: Thelma and Louise are each attempting to estimate the proportion of adults who enjoy listening to…

A: Given that.  p=0.29 C.I for Thelma's=(0.242 , 0.338) C.I for Louise's=(0.237 , 0.323)

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 confidence interval for the difference in the percent that men and women scored on their…

A: confidence interval = (-3 , 0.1)

Q: For each scenario below, decide if it would be appropriate to use (1) Critical z-values or (2)…

A: Solution To find the confidence interval we will use Excel According to the guidelines we solve only…

Q: Which of the following would result in the narrowest confidence interval? A sample size of 30 with…

A: Here we will use the concept of confidence interval  and using the formula of confidence interval we…

Q: A study found a confidence interval on the proportion of children that are hearing impaired was 0.04…

A: Given confidence interval is 0.04 to 0.16 i.e., p-E=0.04 -->1 p+E=0.16 -->2

Q: You have 16 vampire bats. These bats have a population variance of 3.4 ounces. You wish to make a…

A: Given: Sample size (n) = 16 Population variance σ2=3.4 Sample mean x¯=15.20 Confidence level = 0.950

Q: Create a 95% confidence interval for the percent of people who shop on Amazon, using the Plus 4…

A: Given: ∝ = 0.05 n = 50 x = 47 Thus, p^= x/n = 47/50 = 0.94

Q: The police department wants to reduce the margin of error for their 95% confidence interval. If they…

A: Here Given  The police department wants to reduce the margin of error for their 95% confidence…

Q: If n=25, z-46, and s=5, construct a confidence interval at a 95% confidence level. Assume the data…

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Q: Determine the point estimate of the population mean and margin of error for the confidence interval.…

A: Given,lower bound=21upper bound=29

Q: Mark each statement TRUE or FALSE. For these problems, assume that to estimate average time spent…

A: It is given that the sample size is 10.

Q: a sample of 25 automobiles shows that the mean price was $20,500 with standard deviation of $2,500.…

A: Givensample size = n = 25Mean price = $20,500Standard deviation = $2500 The distribution is normal.…

Q: Lorraine was in a hurry when she computed a confidence interval mean. Because the standard deviation…

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Q: now find the 99% confidence interval given the same information, x=13

A: The given regression equation is y^=7+15x se=10.14X__=7n=22∑Xi-X__2=200

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

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Q: You are comparing men and women on hours spent watching TV. You pick a sample of 12 men and 14 women…

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Q: construct a confidence interval for this data. You should construct a 95% confidence interval for…

A: Note: Hi there! Thank you for posting the question. As you have posted multiple questions, as per…

Q: Now change the 'Normal' choice to 'Exponential' This changes the underlying population from one that…

A: Given Sample Size=5 Find a and b parts

Q: If n = 20, the sample mean = 250, SD = 15, SEM = 3.354, what is the confidence interval (using 95%…

A: The formula for a confidence interval for the population mean μ\mu when the population standard…

Q: Import the data from the Hill City Excel file into Minitab. You are trying to predict Price. Note:…

A: Given information:- Price SqFeet Age Bedrooms Bathrooms Garage spaces Mtn View 110000 1000 28 3…