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Jmp Chapter 2 Essay

1022 words - 5 pages

Chapter# 8 Exercises:

1.a: Matched Pairs are more appropriate. Measures are repeated over time

1.b: The matched pairs report for June 1999- March 1999 shows a difference as seen below of 0.05:
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1.c: The matched pairs reports for Aug-June and Aug-March show no significant differences:
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2-a The grouped means method would not be the appropriate test since statistical assumptions for the t test for groups are not satisfied with correlated data. The difference can be detected much better with a paired t-test and you may be overstating the significance if you used a group t-test rather than a paired t-test.

2-b MATCHED PAIRS: There is a small ratio of 0.1218 ...view middle of the document...

1107 , mean is 0.43. When we run the Wilcoxon signed-rank (below), it detected a difference with a p value of 0.0106 (therefore we get different results). This is a nonparametric approach that disregards some of the information in the data and instead of using actual response values it will use the rank ordering of the response. The signed rank test is advantageous to use when the data are non-normal.

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6. Insignificant evidence for a difference: 0.23.

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Monica Warren
CHAPTER#9

1-a. There are 5 levels of the variable “type”. There is not a roughly equal distribution of the types of movies

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1-b: The null hypothesis we are testing is that the groups mean worldwide $ among the groups 5 type of movies is the same. The F ratio of 4.35 is significant with a p-value of 0.0020 which leads us to reject the null hypothesis and confirms there is a difference.

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1-c No they aren’t significantly different, but comedy is. See Oneway analysis on next page with QUANTILE PLOT.

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Welch ANOVA: shows a similar conclusion to the parametric ANOVA. There is a difference among the movie types. The 4 tests shows that the variances are unequal.

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2-a. The null hypothesis is that there is normality within the statistical goodness of fit test. The null hypothesis is true as the data appear to be normal.

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2-b The null hypothesis is that there is no difference in the mean resistance for the 5 instruments. The result is that there aren’t any differences among the 5 probes in measuring resistance.

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2-c: Yes, I am, confident. By looking at the Means for Oneway Anova above, the levels show that the std error for all samples was 0.04654 on the 5 samples. Alss, if you compare the samples means they are all at 196 level, and just decimals apart.

2-d : 0.3020
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3-a: 299,852.4 (299,000.00 + 852.4)
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3-b: Prob>F 0.0031 is evidence...

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