Mathematics, 19.11.2019 01:31, chiefkeef5330
Asportswriter wished to see if a football filled with helium travels farther, on average, than a football filled with air. to test this, the writer used 18 adult male volunteers. these volunteers were randomly divided into two groups of nine subjects each. group 1 kicked a football filled with helium to the recommended pressure. group 2 kicked a football filled with air to the recommended pressure. the mean yardage for group 1 was = 30 yards with a standard deviation of s1 = 8 yards. the mean yardage for group 2 was = 26 yards with a standard deviation of s2 = 6 yards. assume that the two groups of kicks are independent. let μ1 and μ2 represent the mean yardage we would observe for the entire population represented by the volunteers if all members of this population kicked, respectively, a helium-filled football and an air-filled football. let σ1 and σ2 be the corresponding population standard deviations. assuming two-sample t procedures are safe to use, what is a 99% confidence interval for μ1 – μ2? (use the conservative value for the degrees of freedom, which is the formula.)
Answers: 3
Mathematics, 22.06.2019 01:00, sdwhitneyhillis
Arrange the steps to solve this system of linear equations in the correct sequence. x + y = -2 2x – 3y = -9 tiles subtract 3x + 3y = -6 (obtained in step 1) from 2x – 3y = -9 (given) to solve for x. substitute the value of x in the first equation (x + y = -2) to get y = 1. the solution for the system of equations is (-3, 1). x = -15 the solution for the system of equations is (-15, 13). add 3x + 3y = -6 (obtained in step 1) to 2x – 3y = -9 (given), and solve for x. x = -3 substitute the value of x in the first equation (x + y = -2) to get y = 13. multiply the first equation by 3: 3(x + y) = 3(-2) 3x + 3y = -6.
Answers: 1
Mathematics, 22.06.2019 01:30, babyphoraaaaa
Which of the following is an irrational number
Answers: 1
Mathematics, 22.06.2019 04:50, GreenHerbz206
What number produces an irrational number when multiplied by 1/4
Answers: 3
Asportswriter wished to see if a football filled with helium travels farther, on average, than a foo...
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