Mathematics, 21.02.2020 21:53, dsaefong00

A nine-year-old tested professional touch therapist. Using a cardboard partition, she held a hand above one of the therapist’s hands and the therapist was asked to identify the hand that was chosen. What type of study is this? What are the variables of interest?

a. Experiment. The variable of interest is the result of either correct or incorrect to each trial.

b. Observational study. The valuable of interest is which hand is chosen by the therapist for each trail.

c. Observational study. The variable of interest is the result of either correct or incorrect to each trial.

d. Experiment. The valuable of interest is which hand is chosen by the therapist for each trail.

Answers: 2

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answered: yuvallevy14

c.Observational study. The variable of interest is the result of either correct or incorrect to each trial.

Step-by-step explanation:

Observational study is the type of study when a researcher don't influence the outcome of an experiment by imposing a treatment and only observe the outcome of an experiment. A nine year old tested professional observes therapists choices and so this is the observational study.

A nine year old tested professional observes therapists choices and the choice of therapist can be correct or incorrect. So, the variable of interest is the result of either correct or incorrect to each trial.

answered: Guest

step-by-step explanation:

we are given the following expression and we are to solve it and find the product:

-13 × (-5)

solving the given expression in the standard order of solving a mathematical expression, beginning with the opening of brackets and then multiplying the terms and changing their signs.

-3 × -5 = 15 (answer is positive because when negative is multiplied with negative, it gives a positive answer)

answered: Guest

Intersecting secant-tangent theorem states that if a tangent segment and a secant segment are drawn to a circle from an exterior point, then the square of the measure of the tangent segment is equal to the product of the measures of the secant segment and its external secant segment.so to break it down: 1. pq acts as the tangent and ps as the secant with an intersection at p.sr = 21rp = 3x + 3pq = 4x + 4following to equation: tangent squared = the two segments multiplied by each otherso (4x + 4) ^ 2 = (3x + 3) • (21) simplifies to 16x^2 - 31x - 47 = 0 or (16x - 47)(x + 1) x = -1 or x = 47/162. pq acts as the tangent and ps as the secant with an intersection at p (again! )sr = 16rp = xpq = 15(15) ^ 2 = 16 • x225 = 16xx = 225/163. the interesting chords are proportional to each other so a ratio is possible to set up: ap dp 10 3 + x = = —— = pc pb 8 xcross multiple to get 10x = (3 + x)(8)x = 12

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A nine-year-old tested professional touch therapist. Using a cardboard partition, she held a hand ab...