A consumer magazine wants to compare the lifetimes of ballpoint pens of three different brands (measured in days). The magazine takes a random sample of pens of each type in the following table. What is the correct test statistic? Brand 1 Brand 2 Brand 3 382 181 238 242 140 257 216 162 241 319 218 213 a. F (2, 9) = 5.54 b.r = -.34 C. t (11) = 12.16 d.p = .027

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A: The table that shows the necessary calculations is shown below: x x−¯x (x−¯x)2 49 -7.5333…

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A: n1 = 52, x1 = 15, p1 = 0.288 n2 = 48, x2 = 18, p2 = 0.375

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Q: In a 4-week study about the effectiveness of Do you Feel Better? using magnetic insoles to treat…

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A: The sample mean is calculated as follows: x=∑xn  =18+16+16+16+14+18+16+18+14+1910  =16.5

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A: Given: n = 10 Formula Used: Mean X = ∑Xin Sample Standard deviation S = ∑Xi-X2n-1

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A: Given:   Truck Entry failures Exit failures 1 40 47 2 42 55 3 51 56 4 55 57 5 64 57…

Q: a)    Compute s^2

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A: Mean=x¯=∑i=1nxin=16510=16.5 Sample sd=s=∑i=1n xi-x¯2n-1=26.510-1=1.7159

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Q: A university wanted to see whether there was a significant difference in age between its day staff…

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Q: A newly installed automatic gate system was being tested to see if the number of failures in 1,000…

A: Solution: Entry  Exit d= Entry -Exit (d-d) (d-d)2 44 48 -4 -2.125 4.515625 42 50 -8 -6.125…

Q: A newly installed automatic gate system was being tested to see if the number of failures in 1,000…

A: Entry(A) Exit(B) d(A-B)   40 47 -7   42 52 -10   53 56 -3   55 56 -1   62 60 2   54 46 8…

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A: Note: Hey, since multiple subparts are posted, we will answer first three subparts according to our…

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