Find the critical T-value for this 90% confidence interval. Hint: Use the applet to find the T-value for 90% confidence with df = 71 – 1 = 70

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Q: Round to three decimal places. For a confidence level of 90%, find the critical z value

A: Given that ;  Confidence level is 90% To find the critical value = ????

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Q: AT scores are distributed with a mean of 1,500 and a standard devieation of 287. You are interested…

A: Given that, Critical value: Using the z-table, the critical value at 85% confidence level is ,

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A: Given x1=52n1=1000x2=23n2=1000α=0.05

Q: Find the critical t-value for a 95% confidence interval using a t-distribution with 10 degrees of…

A: This t critical value calculated from t table at 0.05

Q: Solve the problem. The following confidence interval is obtained for a population proportion, p:…

A: Given data: The following confidence interval is obtained for a population proportion,          p:…

Q: Find the critical  t-value that corresponds to  99% confidence and   n=10.

A: t distribution: Let us assume X is a random variable following standard normal distribution and Y is…

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: Using the form p ̂ ±ME, express the confidence interval (0.870, 0.894).

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Q: A confidence interval for μ1 − μ2 can be constructed, write down the expression.

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A: From the provided information, Confidence interval is (0.489, 0.6518)

Q: One year, the mean age of an inmate on death row was 40.4 years. A sociologist wondered whether the…

A: Hypothesis: Null Hypothesis (Ho): μ = 40.4 years Alternate Hypothesis (Ha): μ≠40.4 years The 95%…

Q: Construct both a 80% and a 98% confidence interval for B1. B1 = 50, s = 8.8, S22 = 45, n= 21 80% :…

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Q: Everything else being equal, a population with a higher mean yields a confidence interval that is…

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Q: Express the confidence interval 81.9%.   ±.   4.6%.  in interval form.

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Q: Find the critical t-value that corresponds to 99% confidence. Assume 8 degrees of freedom

A: Given, 99% confidence level degree of freedom  df = 8 t value = 3.355

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Q: For a confidence level of 94% for a mean with n = 19, find the critical value t.Enter the answer to…

A: Given that, n = 19, c= 94% The degree of freedom is,

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Q: Find the critical​ t-value that corresponds to 60​% confidence. Assume 5 degrees of freedom.

A: Given: Degree of freedom  = 5 Confidence level  = 60 % To find:  T-critical  value

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Q: Find the critical​ t-value that corresponds to

A: The confidence interval = 80%The degree of freedom = 10Using Formula in excel:T.INV [alpha, DF].

Q: Gabriel is studying the difference in time in seconds it takes a rat to get through a maze with and…

A: Given, The confidence interval for the difference between the times: [−7.14,−6.98][-7.14,-6.98]…

Q: Find the critical​ t-value that corresponds to 50​% confidence. Assume 22 degrees of freedom.

A: Confidence level = 0.50 So, significance level α = 1 - 0.50 = 0.50 Degree of freedom, df = 22 We…

Q: Find a 90% confidence interval for the population mean age of the Smurfs if a sample of 52 smurfs…

A: It is given that, There is a random sample of size 52 and has a mean of 49.7 and the standard…

Q: 90% confidence

A: n = 130  x= 69  p'=xn=0.5307 p=p' ±Zαp'(1-p')n =0.5307±1.645*0.04377=0.5307±0.07200=(0.458,0.6027)

Q: One year, the mean age of an inmate on death row was 40 6 years. A sociologist wondered whether the…

A: Given: μ = 40.6 x¯ =38.9 s = 8.4  n = 32

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A: Given  n=30, s=0.16, ȳ=1.29  Find 95% CI for population mean μ

Q: Determine construct the sample size is 5 and the level confidence is 99.9%. the value of t necessary…

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Q: At 95% level of confidence the Z value is 2.575?

A:

Q: One year, the mean age of an inmate on death row was 40.1 years. A sociologist wondered whether the…

A: Let μ and σ denote respectively the population mean and standard deviation of age of death-row…

Q: One year, the mean age of an inmate on death row was 40.9 years. A sociologist wondered whether the…

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Q: Give a 95% confidence interval for the true mean time students spent practicing for the play.…

A: Given,   Sample size = 120 Sample mean = 45.6 Sample standard deviation = 13.3   Since the…

Q: In each of Exercises, we have presented a confidence interval (CI) for the difference, µ1 - µ2,…

A: The 99% confidence interval is from –10 to 5.