A software company markets a new computer game with two experimental packaging designs.Design 1 is sent to 11 stores; their average sales the first month is 52 units with sample standard deviation 12 units.Design 2 is sent to 6 stores; their average sales the first month is 46 units with a sample standard deviation of 10 units.It is desired to test, at the 0.01 level of significance whether the data provide sufficient evidence to conclude that the mean sales permonth of the two designs are different.Let Hiandl2 denote the average monthly sales for Design 1 and Design 2, respectively.The following hypotheses are being considered.Ho : 41-12 =0 versus H1 : µ1 – µ2 7 0.%3DThe pooled sample variance equals(Give your answer precise to one decimal place, e.g., 12.8, 27.3, 4.0.)The value of the test statistic equals(Give your answer precise to one decimal place, e.g., 12.8, 27.3, 4.0.)The reference distribution is the t-distribution withdegrees of freedom.The rejection region is bounded by the following critical values: +. (Give your answer precise to three decimalplaces.)The decision from the test is tothe null hypothesis. (Write "reject" or "not reject").

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Answered: A software company markets a new…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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A study compared the long-term results of two treatments: a modified Burch procedure, and a sling procedure for stress incontinence with a low-pressure urethra. Thirty-six women took part in the study with 19 in the Burch treatment group and 17 in the sling procedure treatment group. One of the outcome measures at three months post-surgery was maximum urethral closure pressure (cm H2O). In the Burch group the mean and standard deviation were 16.4 and 8.2 cm, respectively. In the sling group, the mean and standard deviation were 39.8 and 23.0, respectively. Construct the 99% confidence interval for the difference in mean maximum urethral closure pressure for the two populations represented by these subjects. What is the critical value of the confidence interval for difference in means? what is the lower bound of a 99% confidence interval for the difference in means? (Burch-Sling) what is the upper bound of a 99% confidence interval for the difference in means? (Birch-Sling)
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A market research firm used a sample of individuals to rate the purchase potential of a particular product before and after the individuals saw a new television commercial about the product. The purchase potential ratings were based on a 0 to 10 scale, with higher values indicating a higher purchase potential. The null hypothesis stated that the mean rating "after" would be less than or equal to the mean rating "before." Rejection of this hypothesis would show that the commercial improved the mean purchase potential rating. Use a = .05 and the following data to test the hypothesis and comment on the value of the commercial. Purchase Rating Purchase Rating Individual After Before Individual After Before 1 6. 6. 3 2 6. 4 6. 7 8 7 6. 5 4 4 8 6. 6 a. What are the hypotheses? Ho: ld is Select Ha: ld is select b. Compute d (to 3 decimals). Compute sa (to 1 decimal).
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