Mathematics, 19.03.2020 06:13 gregorio03
Crawling. a study published in 1993 found that babies born at different times of the year may develop the ability to crawl at different ages! the author of the study suggested that these differences may be related to the temperature at the time the infant is 6 months old. (benson and janette, infant behavior and development [1993])
a. the study found that 32 babies born in january crawled at an average age of 29.84 weeks, with a standard deviation of 7.08 weeks. among 21 july babies, crawling ages averaged 33.64 weeks, with a standard deviation of 6.91 weeks. is this difference significant?
b. for 26 babies born in april the mean and standard deviation were 31.84 and 6.21 weeks, while for 44 october babies the mean and standard deviation of crawling ages were 33.35 and 7.29 weeks. is this difference significant?
c. are these results consistent with the researcher's conjecture?
Answers: 3
Mathematics, 21.06.2019 17:00, figueroajorge8291
Joseph haydn pet store offers wide variety of leashes for dogs. the store purchases one popular type of leash from its manufacturer for $4.38 each. joseph haydn pets marks up leashes at a rate of 238% of cost. what is the retail price of the popular leash?
Answers: 1
Mathematics, 21.06.2019 19:20, mrskhg3395
Based on the diagram, match the trigonometric ratios with the corresponding ratios of the sides of the triangle. tiles : cosb sinb tanb sincposs matches: c/b b/a b/c c/a
Answers: 2
Mathematics, 21.06.2019 21:30, carolyn7938
(03.03 mc) choose the graph below that correctly represents the equation 2x + 4y = 24. (5 points) select one: a. line through the points 0 comma 6 and 12 comma 0 b. line through the points 0 comma negative 6 and 12 comma 0 c. line through the points 0 comma negative 12 and 6 comma 0 d. line through the points 0 comma 12 and 6 comma 0
Answers: 1
Crawling. a study published in 1993 found that babies born at different times of the year may develo...
Mathematics, 12.08.2020 05:01