a 90% confidence interval for the difference between the means of two independent populations with unknown population standard deviations is found to be (-0.2,5.4)
Added by Drew L.
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The given 90% confidence interval for the difference between the means of two independent populations is (-0.2, 5.4). This means that the lower limit is -0.2 and the upper limit is 5.4. Show more…
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Independent random sampling from two normally distributed populations gives the results below. Find a 90% confidence interval estimate of the difference between the means of the two populations. n1 = 89 x1 = 113 σ1 = 23 n2 = 90 x2 = 106 σ2 = 11 The confidence interval is < (μ1 - μ2) < . (Round to four decimal places as needed)
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Consider the following data drawn independently from normally distributed populations: (You may find it useful to reference the appropriate table: t table or z table) x1 = -18.0522 x2 = 9.0812 s1 = 7.9 Construct the 90% confidence interval for the difference between the population means. Assume the population variances are unknown but equal. (Round all intermediate calculations to at least 4 decimal places and final answers to 2 decimal places.) Confidence interval is b. Specify the competing hypotheses in order to determine whether or not the population means differ. Ho: μ1 - μ2 = 0; HA: μ1 - μ2 ≠ 0 Ho: μ1 - μ2 = 0; HA: μ1 - μ2 > 0 Ho: μ1 - μ2 = 0; HA: μ1 - μ2 < 0
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