Test the given claim using the α=0.05 significance level and assuming that the populations are normally distributed.  Claim: The treatment population and the placebo population have the same mean.  Treatment group: n=7, x⎯⎯⎯=111, s=6.1.  Placebo group: n=12, x⎯⎯⎯=104, s=5. (a) The test statistic is  . (b) What are the degrees of freedom? df =  (c) The negative critical value is  . (d) The positive critical value is

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A study was carried out to compare mean customer satisfaction scores at service centers in city A, in city B, and in city C. The sample means on a scale of 0 to 10 were 8.4 in city A, 8.6 in city B, and 7.9 in city C. Each sample size = 100, MS error = 0.41, and the F test statistic = 27.4 has P-value <0.001. Complete parts a through d. a. What is the margin of error for separate 95% confidence intervals? (For df = 297, 1.025 = 1.968.) margin of error = *** tv (Round to two decimal places as needed.) Clear all Check answer ST A

17. Question content area top Part 1 Use a​ t-test to test the claim about the population mean μ at the given level of significance α using the given sample statistics. Assume the population is normally distributed.   ​Claim: μ=52,400​; α=0.10     Sample​ statistics: x=53,647​, s=3000​, n=20   LOADING... Click the icon to view the​ t-distribution table.       Question content area bottom Part 1 What are the null and alternative​ hypotheses? Choose the correct answer below.     A. H0​: μ≠52,400 Ha​: μ=52,400   B. H0​: μ≥52,400 Ha​: μ<52,400   C. H0​: μ=52,400 Ha​: μ≠52,400   D. H0​: μ≤52,400 Ha​: μ>52,400 Part 2 What is the value of the standardized test​ statistic?   The standardized test statistic is enter your response here   . ​(Round to two decimal places as​ needed.) Part 3 What​ is(are) the critical​ value(s)?   The critical​ value(s) is(are) enter your response here   . ​(Round to three decimal places as needed. Use…