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kupik
1 month ago
11

A researcher evaluates the significance of a multiple-regression equation and obtains an F-ratio with df = 2,24. How many partic

ipants were in the sample?
Mathematics
1 answer:
Inessa [12.5K]1 month ago
6 0

Answer:

N=27 individuals

Step-by-step explanation:

Analysis of variance (ANOVA) is employed to assess the differences among group means in a sample.

The sum of squares refers to the cumulative square of variation, which is the dispersion between each individual value and the overall mean.

While conducting a multiple regression, we aim to understand the relationship between multiple independent or predictor variables and one dependent or outcome variable.

<passuming we="" have="" src="https://tex.z-dn.net/?f=k" id="TexFormula1" title="k" alt="k" align="absmiddle" class="latex-formula"> independent variables and j=1,\dots,j individuals, we are able to define the corresponding formulas of variation:

SS_{total}=\sum_{j=1}^n (y_j-\bar y)^2

SS_{regression}=SS_{model}=\sum_{j=1}^n (\hat y_{j}-\bar y)^2

SS_{error}=\sum_{j=1}^n (y_{j}-\hat y_j)^2

We also have this property

SST=SS_{regression}+SS_{error}

The model's degrees of freedom in this instance is determined by df_{model}=df_{regression}=k=2 where k = 2 represents the number of variables.

For the error's degrees of freedom in this case, it is indicated by df_{error}=N-k-1=24. Knowing k allows us to ascertain N.

N=24+k+1=24+2+1=27

The total degrees of freedom would be df=N-1=27 -1 =26

This leads us to conclude that the correct answer is N=27 participants.

</passuming>
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Radio blackouts are among the most common space weather events to affect Earth. Minor radio blackouts occur, on average, twice p
Zina [12379]

Answer:

a.  P(x = 3) = 0.061313

b. The anticipated number of radio blackouts = 4

c.  It's unclear when the next radio blackout will occur.

d. P(x = 4) = 0.19537

Step-by-step explanation:

Based on the provided details:

A Poisson process is utilized to model the occurrence of this event:

Minor radio blackouts occur, on average, two times annually.

Therefore:

\lambda = 2 \ years

For question (a)

time t = 1/2 (i.e., six months)

Let x represent the likelihood of 3 incidents during the remaining months of the year.

Then:

P(x = 3) = \dfrac{e^{-\lambda t} \times (\lambda t)^x}{x!}

P(x = 3) = \dfrac{e^{-2* 0.5} \times (2 * 0.5)^3}{3!}

P(x = 3) = 0.061313

b).

The expected number of radio blackouts over two years is calculated as follows:

We start with:

t = 2 years

E(x) = λ × t

E(x) = 2 × 2

E(x) = 4

Thus, the predicted number of radio blackouts = 4

c).

The time we must wait until the probability of witnessing the next radio blackout reaches at least 0.5 is as follows:

In this case, time (t) =???

Thus:

P(x =1) = 0.5

P(x = 1) = \dfrac{e^{-\lambda t} \times (\lambda t)^x}{x!} = 0.5

\dfrac{e^{-\lambda t} \times (\lambda t)^x}{x!} = 0.5

Consequently, we are unable to ascertain the probability (50%) of the next radio blackout.

d)

We can compute the probability that the time until the fourth blackout is at most 2 years as follows:

Here;

x =4, t = 2

Thus:

P(x = 4) = \dfrac{e^{-4 } \times (4)^4}{4!}

P(x = 4) = 0.19537

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A researcher is studying a group of field mice. the distribution of the weight of field mice is approximately normal with mean 2
AnnZ [12381]

Response:

b

Detailed explanation:

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Sheri’s cab fare was $32, with a 20% gratuity and no taxes. Sheri wrote a check to the cab driver for $40.
zzz [12365]

Indeed, a fare of $40 is a fair charge for the cab ride.

Explanation

Sheri's cab fare totaled $32, with a gratuity rate of 20%.

The gratuity amount is: \$32* 20\% = \$32*0.20= \$6.40

Thus, the total cab fare including gratuity is: \$32+\$6.40 = \$38.40

Since Sheri issued a $40 check to the cab driver, it indicates she provided ($40 - $38.40) or an extra $1.60 to the cab driver. Consequently, the $40 payment is reasonable for the cab fare.

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What values of b satisfy 3(2b + 3)2 = 36?
Inessa [12570]
To determine the values of b that fulfill 3(2b+3)^2 = 36

we start with
3(2b+3)^2 = 36
Divide both sides by 3
(2b+3)^2 = 12
Next, take the square root of both sides
(2b+3)} = (+ /-) \sqrt{12} \\ 2b=(+ /-) \sqrt{12}-3

b1=\frac{\sqrt{12}}{2} -\frac{3}{2}
b1=\sqrt{3} -\frac{3}{2}

b2=\frac{-\sqrt{12}}{2} -\frac{3}{2}
b2=-\sqrt{3} -\frac{3}{2}
Thus,

the solutions for b are
b1=\sqrt{3} -\frac{3}{2}
b2=-\sqrt{3} -\frac{3}{2}
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Brian multiplied his average speed of 14.73 miles per hour by the amount of time he spent cross-country skiing. His product was
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Yes, it was a reasonable result

Step-by-step clarification:

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