You can decrease the width of a confidence interval by: a.lowering the confidence level or decreasing the sample size b. lowering the confidence level or increasing the sample size c. increasing the confidence level or increasing the sample size d. increasing the confidence level or decreasing the sample size

Q: Use the sample data and confidence level to construct the confidence interval estimate of the…

A: We have given that the sample size 550, favourable number of cases X=385 and confidence level is…

Q: Construct the confidence interval for the population mean.   c=0.98 x overbar= 8.1 σ=0.5 and n=44…

A: given that,population standard deviation, σ =0.5sample mean, x =8.1size (n)=44

Q: c. determine the 95% confidence interval estimate for the population proportion of people who watch…

A: Given X=154 n=250

Q: Construct the confidence interval for the population mean μ.   c=0.90​, x=15.5​, σ=10.0​, and n= 80…

A:

Q: (c) Show all steps to construct a 99% confidence interval estimate of the proportion of all human…

A: “Since you have posted a question with multiple sub-parts, we will solve first three subparts for…

Q: If X=70​, σ=14​, and n=61​, construct a 99​% confidence interval estimate of the population​ mean,…

A:

Q: Construct the confidence interval for the populan mean. c = 0.98,x-bar = 4.7,n = 53 a confidence…

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Q: If n=16, x(x-bar)=43, and s=9, find the margin of error at a 99% confidence level Give your answer…

A: The random variable X follows normal distribution. The sample size is 16. The sample mean is 43. The…

Q: 20 The following is an interval estimate with a 95% confidence level for the proportion of Indiana…

A:

Q: In order to construct the 95% confidence interval, you choose which formula? O x ±1.645 × OT ±1.96 x…

A:

Q: What is the number of data values? O 50 O 78 O 120 49 O 76 How many degrees of freedom are used for…

A: data value 76

Q: Use the sample data and confidence level given below to complete parts​ (a) through​ (d).   A…

A: Solution: From the given information, X=519 and n=956.

Q: Construct the confidence interval for the population mean μ. c=0.90​, x=16.9​, σ=8.0​, and n=

A: If the population standard deviation is known we can use z test for computing confidence interval…

Q: Use the given confidence interval limits to find the point estimate ^p and the margin of error E.…

A: The sample proportion (p) p = 0.65 + 0.71 / 2 p = 0.68

Q: Given the following sample sizes and t values used to construct confidence intervals, find the…

A: Given:

Q: n=31, ¯xx¯(x-bar)=30, and s=5, construct a confidence interval at a 98% confidence level. Assume the…

A:

Q: Which of the following will decrease the width of a confidence interval for the proportion? I.…

A: It is given that the width of a confidence interval for the proportion will decrease.

Q: find the margin of error at a 95% confidence level

A: Formula for margin of error is,

Q: If n=11, ¯xx¯(x-bar)=32, and s=9, find the margin of error at a 98% confidence level

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Q: Complete the statement by filling in the blank. When constructing a confidence interval for a…

A: We want to tell you which one is the correct choice.

Q: A research institute poll asked respondents if they felt vulnerable to identity theft. In the​ poll,…

A:

Q: Construct the confidence interval for the population mean μ.   c=0.95​, x=8.1​, σ=0.3​, and n= 40

A:

Q: Suppose we wish to decrease the width of the confidence interval for µ. What are two ways in which…

A: The c% confidence interval for population mean will signify that with c% confidence the population…

Q: Determine whether the following statements are true or false. Increasing the sample size while…

A: If the sample size increases, then the standard error of statistic decreases. The margin of error is…

Q: Suppose someone wanted an 75%-confidence interval. What value of z should they use? Choose the…

A: Level of significance ɑ=0.25

Q: Construct a confidence interval of a survey of annual earnings of Gateway students, using the…

A: Solution-: Given: We find  (a) Use 98% Confidence level (b) For 95% C.I. (c) For 95% C.I. When…

Q: m. Assuming someone's attendance is 75%, what overall course grade would you expect them to have? n.…

A: The study is interested in determining if attendance affects a student's overall course grade.

Q: If n=23, ¯x(x-bar)=34, and s=8, find the margin of error at a 99% confidence level Give your answer…

A: Solution: From the given information, n=23, x-bar=34 and s=8. The confidence level is 0.99.

Q: Which confidence interval is wider? O a. (x, y) O b. (M. N n 250 650 90% Confidence Interval (M, N)…

A: Given data is n 90% confidence interval 250 (M,N) 650 (X,Y)

Q: If n=25, 7(x-bar)=48, and s=4, find the margin of error at a 80% confidence level

A: The sample size is 25, sample mean is 48, and sample standard deviation is 4. The degrees of freedom…

Q: If n=27, x(x-bar)=40, and s=14, construct a confidence interval at a 98% confidence level. Assume…

A: Question is solved.

Q: The following confidence interval is obtained from a population proportion, p: 0.883 < p < 0.911…

A: We know that the confidence interval formula is: Here E=Margin of error   Using the formula we get…

Q: If n=32, ¯xx¯ (x-bar)=49, and s=4, find the margin of error at a 95% confidence level (use at least…

A:

Q: NASA is interested in the true proportion of children who are interested in becoming astronauts. At…

A: Disclaimer: Since you have asked multiple questions, we will solve the first question for you. If…

Q: iven the information: the sampled population is normally distributed, X– = 36.5, σ = 3, and n = 20.…

A: Solution-: Given: x¯=36.5,σ=3,n=20 (a) What is the 95% confidence interval estimate for μ? (b) Are…

Q: If n=12, ¯xx¯(x-bar)=48, and s=6, find the margin of error at a 98% confidence level

A: From the provided information, Sample size (n) = 12 Sample mean (x̄) = 48 Standard deviation (s) = 6…

Q: Construct the confidence interval for the population mean μ.   c=0.98​, x=16.6​, σ=7.0​, and n= 70…

A: Given that  98% confidence interval  x=16.6​, σ=7.0​, and n= 70

Q: Given that degrees of freedom is 18 at 95% confidence level, the value of t =________. Select one:…

A: Given that degrees of freedom is 18 at 95% confidence level since the hypothesis is left tailed or…

Q: 15, ¯xx¯(x-bar)=39, and s=11, construct a confidence interval at a 95% confidence level. Assume the…

A: Sample size (n) =15 Sample mean (x¯)=39 Sample standard deviation (s)=11 Confidence level (C)=95%…

Q: Use the sample data and confidence level given below to complete parts​ (a) through​ (d).   A…

A: Given, The sample proportion is,

Q: (c) If the confidence levels were 98% rather than 80%, would the margin of error be larger or…

A: The confidence levels are 98% and 80%.

Q: Find the value oft within a) 90% confidence level and n = 10 b) 95% confidence level and n = 6 c)…

A: As per our guidelines we are supposed to answer only 3 sub-parts of any question so I am solving…

Q: . Find the length of the confidence interval, given the following data: s= 6.5, n = 15, confidence…

A:

Q: We would like to create a confidence interval for the mean. Which of the following would produce the…

A: Margin of error = Width/2

Q: If n=23, x(x-bar)=47, and s=3, find the margin of error at a 98% confidence level Give your answer…

A: Margin error is the difference between the estimated value and the original value. Here the critical…

Q: If X=80​, σ=11​,and n=62​,construct a 95​% confidence interval estimate of the population​ mean, μ.…

A: Given,sample size(n)=62sample mean(x¯)=80standard deviation(σ)=11α=1-0.95=0.05α2=0.025Z0.025=1.96…

Q: 26.4, 226.9, 227.1, and 228.6.  Student B:  229.5, 226.1, 230.7, 223.8, and 227.5

A: For student A: Sample size, n=5 228.3, 226.4, 226.9, 227.1, 228.6…

Q: ind the point estimate, the standard error, and the margin of error for the given confidence levels…

A: The provided information is  n=80 x=29 C=0.92 α=0.08   The critical value is  zc= ±1.7507 (from…

Q: An online seller of Yema Cake, surveyed several customers. Fifty-two percent (52%) of the customers…

A: