Mathematics, 07.03.2020 04:36, andrewmena05
From her firm's computer telephone log, an executive found that the mean length of 68 telephone calls during July was 4.38 minutes with a standard deviation of 5.52 minutes. She vowed to make an effort to reduce the length of calls. The August phone log showed 44 telephone calls whose mean was 2.458 minutes with a standard deviation of 2.506 minutes. Steps: 1. Open Minitab on your computer. 2. There is no data file for this example. The information above contains summarized data (take info from story and plug into Minitab) (a) Choose the appropriate hypotheses for a right-tailed test to see if calls were quicker, on average, in August. Assume µ1 is the average call length in July and µ2 is the average call length in August. a. H0: μ1 – μ2 ≤ 0 vs. H1: μ1 – μ2 > 0 b. H0: μ1 – μ2 < 0 vs. H1: μ1 – μ2 ≤ 0 a b (b-1) Obtain a test statistic tcalc and p-value assuming unequal variances. (Use Minitab. Round your answers to 3 decimal places.) tcalc p-value (b-2) Interpret the results using α = .01. the null hypothesis.
Answers: 3
Mathematics, 21.06.2019 17:50, aaroncx4900
Jace wrote a sentence as an equation. 56 is 14 more than a number. 14+ = 56 which statement best describes jace's work? jace is not correct. the phrase more than suggests using the symbol > and jace did not use that symbol. jace is not correct. he was correct to use addition, but the equation should be 56+ p = 14 jace is not correct. the first number in the sentence is 56, so the equation should start with 56. jace is correct. the phrase more than suggests addition, so jace showed that 14 plus a variable equals 56. o
Answers: 1
From her firm's computer telephone log, an executive found that the mean length of 68 telephone call...
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