Use the given information to find the number of degrees of freedom, the critical values x and x. and the confidence interval estimate of a. It is reasonable t assume that a simple random sample has been selected from a population with a normal distribution. Platelet Counts of Women 90% confidence; n= 25, s= 65.9. Click the icon view the table of Chi-Square critical values. df = 24 (Type a whole number.) (Round to three decimal places as needed.)

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 90% confidence interval for p given that p = 0.9 and n 130. Round your answer for the point estimate to two decimal places, and your answers for the margin of error and the confidence interval to three decimal places. Point estimate = Margin of error = ± i The 90% confidence interval is i to i

Use the normal distribution to find a confidence interval for a difference in proportions p1 – P2 given the relevant sample results. Assume the results come from random samples. A 99% confidence interval for p, – P2 given counts of 19 yes out of 200 sampled for Group 1 and 32 yes out 130 sampled for Group 2 Give the best estimate for p, – p2, the margin of error, and the confidence interval. Round your answers to three decimal places. Best estimate : Margin of error: i Confidence interval : i to i

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A student who took Stat 2 last semester learns that their overall course score was at the 85th percentile. Assuming that a histogram of all the Stat 2 course scores from last semester follows the normal curve, this means that this student had a score that was how many SDs above the average score? Choose the answer that is closest. Group of answer choices 1.15 1.05 1.10 1.0      PreviousNext

Find the first and third quartile for the data shown x 10.3 12.1 14.7 17.3 18.7 19.9 20 27.7 27.8 28.4 Q1 = Q3 =

Use the given confidence interval to find the margin of error and the sample mean. (11.3,21.1) The sample mean is The margin of error is

You intend to estimate a population mean with a confidence interval. You believe the population to have a normal distribution. Your sample size is 8. While it is an uncommon confidence level, find the critical value that corresponds to a confidence level of 93.5%.