A random sample of 160 items is drawn from a population whose standard deviation is known to be σ = 30. The sample mean is  x⎯⎯x¯ = 800. (a) Construct an interval estimate for μ with 95 percent confidence. (Round your answers to 1 decimal place.)  The 95% confidence interval is from _______ to  ________ (b) Construct an interval estimate for μ with 95 percent confidence, assuming that σ = 60. (Round your answers to 1 decimal place.)  The 95% confidence interval is from _______ to  ________ (c) Construct an interval estimate for μ with 95 percent confidence, assuming that σ = 120. (Round your answers to 1 decimal place.)  The 95% confidence interval is from ________ to  ________ (d) Describe how the confidence interval changes as σ increases.   The interval stays the same as σ increases. The interval gets wider as σ increases. The interval gets narrower as σ increases. The interval gets wider as σ decreases.

Q: ample of 1100 observations taken from a population produced a sample proportion of 0.30. Make a 90%…

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

Q: H0: μN= μD H1: μN ≠ μD   The sample consisted of 60 night students, with a sample mean GPA of 2.67…

A: Hello, thanks for posting your question here.  Since in the question, it is mentioned that " sample…

Q: Construct the confidence interval for the population mean μ.   c=0.90​, x=4.2​, σ=0.8​, and n=57   A…

A:

Q: Calculate the left and right chi square values, then give the confidence interval. Sample Standard…

A: Given that: The value of n=21. The value of s=31. As the confidence level is 0.90. The value of α is…

Q: (a) Construct an interval estimate of μ with 95% confidence. (Round your answers to 3 decimal…

A: n = 25 xbar =850 s =15 t-critical value at df(24) and alpha(0.05) is 2.064

Q: A political candidate has asked you to conduct a poll to determine what percentage of people support…

A:

Q: A simple random sample of 60 items from a population with a = 5 resulted in a sample mean of 33. (a)…

A: Solution-: Given: x¯=33,n=60,σ=5 We want to find, (a) A 90% C.I. for the population mean. (b) A 95%…

Q: ​(a) Construct a 95​% confidence interval about μ if the sample​ size, n, is 35.   Lower​ bound:…

A: Given that  Sample mean =19.1 Standard deviation =4.1 NOTE:- According to bartleby guidelines expert…

Q: A random sample of 26 items is drawn from a population whose standard deviation is unknown. The…

A: Given information- Sample size, n = 26 Sample mean, x-bar = 860 Using student’s t-test. Significance…

Q: Ages of Gamblers The mean age of a sample of 22 people who were playing the slot machines is 50.2…

A: To test the difference of means, through unknown population parameters (here population standard…

Q: A random sample of 23 items is drawn from a population whose standard deviation is unknown. The…

A: Given: n = 23 x¯= 840 ∝ = 0.02 Part a: We have, s = 15 The 98% confidence interval is given by,…

Q: oduct of two numbers is 20 the quotient of the two numbers is 5    what are the two numbers?

A: Let, x and y be the two numbers, the product of two numbers = x*y = 20 the quotient of the two…

Q: Assume that we want to construct a confidence interval. Do one of the​ following, as appropriate.​…

A:

Q: Baby weights: The weight of male babies less than2months old in the United States is normally…

A:

Q: You want to obtain a sample to estimate how much parents spend on their kids birthday parties. Based…

A: Solution: Given:                      Population standard deviation σ = 70.9 dollars…

Q: Express the confidence interval (19.6%,28.2%)in the form of ˆp±ME.

A: The given confidence interval is (19.6%,28.2%).

Q: population, find the point and interval estimates of the population mean adopting a confidence B.…

A: As per our guidelines we are suppose to answer only one question. Given,sample size(n)=17sample…

Q: A confidence interval was calculated using a sample size of n = 100 to make an inference about a…

A: Given: n=100, σ=57.14, L=10 and U=30. The confidence interval is calculated asx-zσn, x+zσn=L, U

Q: A random sample of 21 items is drawn from a population whose standard deviation is unknown. The…

A:

Q: Use the sample information x¯x¯ = 38, σ = 4, n = 11 to calculate the following confidence intervals…

A:

Q: Find the critical value zα/2that corresponds to the given confidence level.   86​%…

A:

Q: Use the sample information x¯x¯ = 43, σ = 6, n = 13 to calculate the following confidence intervals…

A: Given Information: Sample mean x¯=43 Population standard deviation σ=6 Sample size n=13 Since,…

Q: Use the sample information ¯x¯ = 43, σ = 3, n = 13 to calculate the following confidence intervals…

A:

Q: Use the sample information x⎯⎯x¯ = 37, σ = 5, n = 15 to calculate the following confidence…

A: Solution: Given information: n= 15 Sample size  x= 37   Sample mean σ= 5   Population standard…

Q: A random sample of 25 items is drawn from a population whose standard deviation is unknown. The…

A: We need to construct confidence intervals using given information  sample size n = 25  The sample…

Q: tandard deviation for g nΣf X)- n(n-1 mb: s ran 4 s). A survey of 240 men found that 144 gamble.…

A: Step 1: Calculate Point Estimate of p1​−p2​The sample proportions are: p^​1​= Number of men who…

Q: 19. FBI Report: Larceny Thirty small communities in Connecticut (population near 10,000 each) gave…

A: For a known σ, the CI for the population mean is,        x¯±Margin of Errori.e x¯±Zσnwhere x¯=sample…

Q: According to the National Institutes of Health, 55% of adults experience some form of lactose…

A: Let p denotes the population proportion of adults who experience some form of lactose intolerance.…

Q: xpress the confidence interval (65.2%,83.2%) in the form of ˆp ± ME. _____% ± _____ %

A: The confidence interval is (65.2%, 83.2%).

Q: Suppose 40 measurements of the drying times are recorded. The sample mean and the standard deviation…

A: The random variable drying times follows normal distribution. We have to construct 95% CI for the…

Q: A random sample of 21 items is drawn from a population whose standard deviation is unknown. The…

A: Given information- Sample size, n = 21 Sample mean, x-bar = 750 Using student’s t-test. Significance…

Q: The standard deviation for a population is σ = 15.6 . A sample of 25 observations selected from this…

A:

Q: A random sample of 25 items is drawn from a population whose standard deviation is unknown. The…

A: (a) The sample size is 25, sample mean is 850, sample standard deviation is 15. The degrees of…

Q: distribution of scores on a standardized test is approximately Normal with standard deviation of σ =…

A:

Q: Assume that a sample is used to estimate a population mean μμ. Find the 90% confidence interval for…

A: The mean is 52.8 and the standard deviation is 20.3.

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.