Two samples are taken with the following sample means, sizes, and standard deviations
= 33 = 26
= 55 = 52
= 3 = 4
Find a 97% confidence interval, round answers to the nearest hundredth.
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The statistic software output for this problem is:
-0.112 < p1−p2 < 0.195
Two samples are taken with the following sample means, sizes, and standard deviations
Two samples are taken with the following sample means, sizes, and standard deviations ¯x1 = 32 ¯x2 = 35 n1 = 68 n2= 56 s1 = 3 s2= 4 Estimate the difference in population means using a 96% confidence level. Use a calculator, and do NOT pool the sample variances. Round answers to the nearest hundredth. < μ1−μ2 <
Two samples are taken with the following sample means, sizes, and standard deviations ¯ x1 x¯1 = 31 ¯ x2 x¯2 = 28 n1 n1 = 70 n2 n2 = 46 s1 s1 = 4 s2 s2 = 2 We want to estimate the difference in population means using a 89% confidence level. What distribution does this require? t, df = 108 z NOTE: The more accurate df formula, used above, is: df= ( s 2 1 n1 + s...
Two samples are taken with the following sample means, sizes, and standard deviations ¯x1 = 25 ¯x2 = 23 n1 = 54 n2 = 73 s1 = 5 s2 = 3 Estimate the difference in population means using a 88% confidence level. Use a calculator, and do NOT pool the sample variances. Round answers to the nearest hundredth.
Two samples are taken with the following sample means, sizes, and standard deviations x¯1 = 20 x¯2 = 26 n1 = 60 n2 = 72 s1 = 4 s2 = 2 Find a 92% confidence interval, round answers to the nearest hundredth.
Independent random samples were selected from two quantitative populations, with sample sizes, means, and standard deviations given below. n1 = n2 = 60 x1 = 125.3 x2 = 123.4 s1 = 5.7 s2 = 6.1 a) Construct a 95% confidence interval for the difference in the population means (μ1 − μ2). (Round your answers to two decimal places.) to b) Find a point estimate for the difference in the population means. c) Calculate the margin of error. (Round your answer...
Two samples are taken with the following sample means, sizes, and standard deviations ¯ x 1 = 37 ¯ x 2 = 39 n 1 = 73 n 2 = 48 s 1 = 3 s 2 = 5 Estimate the difference in population means using a 90% confidence level. Use a calculator, and do NOT pool the sample variances. Round answers to the nearest hundredth. < μ 1 − μ 2<
Two random samples are selected from two independent populations. A summary of the samples sizes, sample means, and sample standard deviations is given below: n1= 37 n2=44 x-bar1= 58.6 x-bar2= 73.8 s1=5.4 s2=10.6 Find a 97% confidence interval for the difference μ1−μ2μ1−μ2 of the means, assuming equal population variances.
Two samples are taken with the following sample means, sizes, and standard deviations ¯x1x¯1 = 24 ¯x2x¯2 = 25 n1n1 = 65 n2n2 = 71 s1s1 = 4 s2s2 = 3 Estimate the difference in population means using a 88% confidence level. Use a calculator, and do NOT pool the sample variances. Round answers to the nearest hundredth. < μ1−μ2μ1-μ2 <
Two random samples are selected from two independent populations. A summary of the samples sizes, sample means, and sample standard deviations is given below: n1=51, n2=46, x¯1=57.8, x¯2=75.3, s1=5.2 s2=11 Find a 94.5% confidence interval for the difference μ1−μ2μ1−μ2 of the means, assuming equal population variances. Confidence Interval =
Two samples are taken with the following sample means, sizes, and standard deviations 21 = 24 m2 = 31 ni = 60 n2 = 65 $1 = 5 82 = 3 Estimate the difference in population means using a 89% confidence level. Use a calculator, and do NOT pool the sample variances. Round answers to the nearest hundredth. <Hi - 42