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3 years ago

15

The model below shows the number 7.77. ONES TENTHS HUNDREDTHS 7 . 7 7 Using the model of 7.77, how does the 7 in the tenths plac

e compare to the 7 in the place to its right?

1 answer:

valina [46]3 years ago

5 0

The 7 in the tenth place is equal to 7 times the value on the right

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McAllister et al. (2012) compared varsity football and hockey players with varsity athletes from noncontact sports to determine

jonny [76]

Answer:

$t _{critical} = 1.760$

t = 2.2450

d. 0.264

Step-by-step explanation:

The null hypothesis is:

$H_o: \mu_1 - \mu_2 = 0$

Alternative hypothesis;

$H_a : \mu_1 - \mu_2 > 0\\$

The pooled variance t-Test would have been determined if the population variance are the same.

$S_p^2 = \dfrac{(n_1-1)S_1^2+(n_2-1)S^2_2}{(n_1-1)+(n_2-1)}$

$S_p^2 = \dfrac{(8-1)2.507^2+(8-1)2.8282^2}{(8-1)+(8-1)}$

$S_p^2 = 7.14$

The t-test statistics can be computed as:

$t= \dfrac{(x_1-x_2)-(\mu_1 - \mu_2)}{\sqrt{Sp^2 ( \dfrac{1}{n} +\dfrac{1}{n_2})}}$

$t= \dfrac{(9-6)-0}{\sqrt{7.14 ( \dfrac{1}{8} +\dfrac{1}{8})}}$

$t= \dfrac{3}{1.336}$

t = 2.2450

Degree of freedom $df = (n_1 -1) + ( n_2 +1 )$

df = (8-1)+(8-1)

df = 7 + 7

df = 14

At df = 14 and ∝ = 0.05;

$t _{critical} = 1.760$

Decision Rule: To reject the null hypothesis if the t-test is greater than the critical value.

Conclusion: We reject $H_o$ and there is sufficient evidence to conclude that the test scores for contact address s less than Noncontact athletes.

To calculate r²

The percentage of the variance is;

$r^2 = \dfrac{t^2}{t^2 + df}$

$r^2 = \dfrac{2.2450^2}{2.2450^2 + 14}$

$r^2 = \dfrac{5.040025}{5.040025+ 14}$

$r^2 = 0.2647$

7 0

2 years ago

What's The Answer? Good Luck!

ra1l [238]

I guess b it should be

6 0

2 years ago

Read 2 more answers

Marcus loves baseball and wants to create a home plate for his house. Marcus needs to calculate the area of the home plate at th

Jobisdone [24]

<u><em>Answer:</em></u>

Area of the polygon = 59 in²

<u><em>Explanation:</em></u>

From the given diagram, we can note that the given polygon is composed of an upper triangle, a side triangle and a rectangle

<u>Therefore:</u>

Area of polygon =

area of upper triangle + area of side triangle + area of rectangle

<u>1- getting the area of the upper triangle:</u>

<u>We have:</u>

base of triangle = 7 in

height of triangle = 6 in

<u>Therefore:</u>

Area of upper triangle = $\frac{1}{2}*base*height = \frac{1}{2}*7*6=21$ in²

<u>2- getting the area of the side triangle:</u>

<u>We have:</u>

base of triangle = 4 in

height of triangle = 5 in

<u>Therefore:</u>

Area of upper triangle = $\frac{1}{2}*base*height = \frac{1}{2}*4*5=10$ in²

<u>3- getting the area of the rectangle:</u>

<u>We have:</u>

length of rectangle = 7 in

width of rectangle = 4 in

<u>Therefore:</u>

Area of rectangle = length x width = 7 x 4 = 28 in²

<u>4- getting the total area of the polygon:</u>

Area of polygon =

area of upper triangle + area of side triangle + area of rectangle

<u>Therefore:</u>

Area of polygon = 21 + 10 + 28 = 59 in²

Hope this helps :)

4 0

3 years ago

Christy drove 270 miles in 6 hours at a constant speed. What is the unit rate? Include units.

scoundrel [369]

Answer:

45m/hr

Step-by-step explanation:

Divide 270 by 6 to determine the unit rate.

$\frac{270}{6} = 45$

Therefore, the unit rate is 45 miles per 1 hour.

5 0

2 years ago

Find out how fast the turtle is going. A turtle is walking across the street. The truck is coming. Oh NO.... you need to help hi

AnnZ [28]

Answer: 10 miles per hour

Step-by-step explanation: he doesn’t have to go that fast because the truck will be there in 1 minute he could travel 10 feet going 10 miles per hour

6 0

3 years ago