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mathematics
december 2019
16

Mathematics Questions and Answers December 16, 2019

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3. A random sample of 49 four-year public colleges has a mean annual tuition of $5,900. Suppose annual tuition at four-year public colleges is distributed normally with a known standard deviation (o ) of $689. (Note: selected z* values from Table C are listed at the top of this exam.) (a) (5 pts.) Construct a 99% confidence interval for the

1. Compute for Pearson Product Moment of Correlation (r) of the following: a. x 4 6 6 7 7 9 10 y 35 6 5 8 6 9 Ex Ey Ex^2 [y^2 Exy A 3 16 9 12 6 36 25 30 6 36 36 36 5 49 25 35 49 64 56 9 6 81 36 54 10 9 100 81 90 49 42 367 276 2058 r = 72058-4942 / V(7367-49^2)(7*276-42^2) r = 0.792 b. x 4 6 6 7 7 9 10 y 968 565 3

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