Homework Answers
For n= 9
degrees of freedom = 8
for 99% CI , alfa = 0.01 , alfa/2 = 0.005
for 99% confidence interval and df = 8
percentile from t distribution = 3.355
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T-distribution Confidence Interval
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Find the appropriate percentile from a t-distribution for constructing the following confidence interval 90% t-interval with n = 18
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Use the normal distribution to find a confidence interval for a proportion p given the relevant sample results. Give the best point estimate for p, the margin of error, and the confidence interval. Assume the results come from a random sample. A 99% confidence interval for p given that p = 0.7 and n = 100. Round your answer for the point estimate to two decimal places, and your answers for the margin of error and the confidence interval to...
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Assume that we want to construct a confidence interval. Do one of the following, as appropriate: (a) find the critical value ta /2, (b) find the critical value Za/2, or (c) state that neither the normal distribution nor the t distribution applies. Here are summary statistics for randomly selected weights of newborn girls: n= 182, x = 32.8 hg, s = 6.2 hg. The confidence level is 90%. Select the correct choice below and, if necessary, fill in the answer...
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