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Mathematics, 24.07.2019 12:30 ultimatesaiyan
Are women's feet getting bigger? retailers in the last 20 years have had to increase their stock of larger sizes. wal-mart stores, inc., and payless shoesource, inc., have been aggressive in stocking larger sizes, and nordstrom's reports that its larger sizes typically sell out first. assuming equal variances, at α = .025, do these random shoe size samples of 12 randomly chosen women in each age group show that women's shoe sizes have increased? born in 1980: 8 7.5 8.5 8.5 8 7.5 9.5 7.5 8 8 8.5 9 born in 1960: 8.5 7.5 8 8 7.5 7.5 7.5 8 7 8 7 8 click here for the excel data file (a) choose the appropriate hypotheses assuming equal variances at α = .025. a. h0: μ1960 – μ1980 ≥ 0 vs. h1: μ1960 – μ1980 < 0. reject h0 if tcalc < –2.074. b. h0: μ1960 – μ1980 ≤ 0 vs. h1: μ1960 – μ1980 > 0. reject h0 if tcalc > –2.074. c. h0: μ1960 – μ1980 ≥0 vs. h1: μ1960 – μ1980 < 0. reject h0 if tcalc < 2.074. d. h0: μ1960 – μ1980 ≤0 vs. h1: μ1960 – μ1980 > 0. reject h0 if tcalc < 2.074. a b c d (b) the average shoe size of women has increased. false true
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Mathematics, 21.06.2019 21:30, stressedmolly8387
An annual marathon covers a route that has a distance of approximately 26 miles. winning times for this marathon are all over 2 hours. the following data are the minutes over 2 hours for the winning male runners over two periods of 20 years each. earlier period 14 12 15 22 13 10 19 13 9 14 20 18 16 20 23 12 18 17 6 13 recent period 7 11 7 14 8 9 11 14 8 7 9 8 7 9 9 9 9 8 10 8 (a) make a stem-and-leaf display for the minutes over 2 hours of the winning times for the earlier period. use two lines per stem. (use the tens digit as the stem and the ones digit as the leaf. enter none in any unused answer blanks. for more details, view how to split a stem.) minutes beyond 2 hours earlier period 0 1 2 (b) make a stem-and-leaf display for the minutes over 2 hours of the winning times for the recent period. use two lines per stem. (use the tens digit as the stem and the ones digit as the leaf. enter none in any unused answer blanks.) minutes beyond 2 hours recent period (c) compare the two distributions. how many times under 15 minutes are in each distribution
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Mathematics, 21.06.2019 22:30, lamooothegoat
The pair of coordinates that do not represent the point( 5,150’) is a. (5,-210) b. (5,210) c. (-5,330) d. (-5,-30)
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