f98exm2d

# f98exm2d - COURSE MSCI 3710 EXAM 2 Version D SEMESTER Fall...

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COURSE: MSCI 3710 Print Name: EXAM 2 Signature: Version D S.S.#: SEMESTER: Fall 1998 Seat Number: Note: Whenever question(s) are connected you may be asked to assume a result (given a value) from the previous question but this result may or may not be correct. This is to prevent you from losing points on a second question because you made a mistake on a previous question.

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Case I: Use the information given in the paragraph below to answer the next four questions. An auto parts manufacturing plant is studying what is required for them to go to just in time (JIT) manufacturing. The plant manager of the shop is concerned with the length of time that it takes to obtain special-orders from their suppliers. The number of days it takes to special-order a part is recorded for 15 randomly selected orders from each of three suppliers, as shown in the following table. A B C 14 8 11 18 22 12 13 9 19 11 15 19 9 6 11 13 11 13 18 12 20 11 10 13 13 8 16 19 14 13 16 10 19 13 6 13 13 10 10 12 14 8 16 11 16 The manager uses the data to test the claim, at the 0.05 significance level, that there is a difference in the mean times that it takes for suppliers to deliver parts. The results of the ANOVA are shown in the partially filled table below. Anova: Single Factor SUMMARY Groups Count Sum Average Variance A 15 209 13.93333 8.352381 B 15 166 11.06667 16.49524 C 15 213 14.2 14.02857
ANOVA Source of Variation SS df MS F P-value F crit Between Groups 2 45.3 0.039507 Within Groups 544.3 42 12.96 Total 634.8 44 1. Which of the following is the correct alternative hypothesis? A. Ha: the mean time to deliver orders is the same for all three suppliers. B. Ha: the mean time to deliver orders is not the same for all three suppliers. C. Ha: the mean time to deliver orders from each supplier is different from the others. D. Ha: the mean time to deliver orders is most different for supplier C. E. Ha: the mean time to deliver orders is the same among blocks of time. 2. What is the calculated value of the test statistic to test the claim there is a difference in the mean times to special-order a part from a supplier? A

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## This note was uploaded on 03/09/2011 for the course DSCI 3710 taught by Professor Dr.jay during the Spring '08 term at North Texas.

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f98exm2d - COURSE MSCI 3710 EXAM 2 Version D SEMESTER Fall...

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