Mathematics, 05.12.2019 02:31 lilbaby1433
The producers of a new toothpaste claim that it prevents more cavities than other brands of toothpaste. a random sample of 60 people used the new toothpaste for 6 months. the mean number of cavities at their next checkup is 1.5. in the general population, the mean number of cavities at a 6-month checkup is 1.73 (σ = 1.12). a. is this a one- or two-tailed test? b. what are h0 and ha for this study? c. compute zobt. d. what is zcv? e. should h0 be rejected? what should the researcher conclude? f. determine the 95% confidence interval for the population mean, based on the sample mean.
Answers: 1
Mathematics, 21.06.2019 22:00, reyrey216
Asystem of linear equations with more equations than unknowns is sometimes called an overdetermined system. can such a system be consistent? illustrate your answer with a specific system of three equations in two unknowns. choose the correct answer below. a. yes, overdetermined systems can be consistent. for example, the system of equations below is consistent because it has the solution nothing. (type an ordered pair.) x 1 equals 2 comma x 2 equals 4 comma x 1 plus x 2 equals 6 b. no, overdetermined systems cannot be consistent because there are fewer free variables than equations. for example, the system of equations below has no solution. x 1 equals 2 comma x 2 equals 4 comma x 1 plus x 2 equals 12 c. yes, overdetermined systems can be consistent. for example, the system of equations below is consistent because it has the solution nothing. (type an ordered pair.) x 1 equals 2 comma x 2 equals 4 comma x 1 plus x 2 equals 8 d. no, overdetermined systems cannot be consistent because there are no free variables. for example, the system of equations below has no solution. x 1 equals 2 comma x 2 equals 4 comma x 1 plus x 2 equals 24
Answers: 3
The producers of a new toothpaste claim that it prevents more cavities than other brands of toothpas...
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