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Mumz [18]
3 years ago
5

Can someone help with this ??

Mathematics
1 answer:
White raven [17]3 years ago
3 0

Answer:

D

Step-by-step explanation:

Range is the least number (50) subtracted from the greatest number (90)

90-50 = 40 (range)

The most dots is at 70 and the chart is symmetrical.

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Estimate the sum 7.36 + 9.47​
arsen [322]

Answer:

16.83

Step-by-step explanation:

7.36

+ 9.47

----------

16.83

4 0
3 years ago
Tennis elbow is thought to be aggravated by the impact experienced when hitting the ball. The article "Forces on the Hand in the
Gnoma [55]

Answer:

Step-by-step explanation:

Hello!

The objective is to study whether there is a greater force after impacting on one- handed backhand drive in advanced tennis players than in intermediate tennis players.

Sample 1: Advanced tennis players

X₁: Force (N) on the hand just after impact on a one- handed backhand drive for an advanced tennis player.

n₁= 6

X[bar]₁= 40.29 N

S₁= 11.29

Sample 2: Intermediate players

X₂: Force (N) on the hand just after impact on a one- handed backhand drive for an intermediate tennis player.

n₂= 8

X[bar]₂= 21.40

S₂= 8.30

Assuming that both variables have a normal distribution and both population variances are equal, to compare these two populations is best to do so trough their population means using a t-test for independent samples.

If the force is greater for the advanced players than for the intermediate players, then you'd expect the population mean for the advanced players to be greater than the population mean for the intermediate players:

H₀: μ₁ ≤ μ₂

H₁: μ₁ > μ₂

α: 0.05

t= \frac{(X_[bar]_1-X[bar]_2)-(Mu_1-Mu_2)}{Sa\sqrt{\frac{1}{n_1} +\frac{1}{n_2} } } ~~t_{n_1+n_2-2}

Sa= \sqrt{\frac{(n_1-1)S_1^2+(n_2-1)S_2^2}{n_1+n_2-2} } = \sqrt{\frac{5*127.51+7*68.92}{6+8-2} }= 9.66

t_{H_0}= \frac{(40.29-21.40)-0}{9.66\sqrt{\frac{1}{6} +\frac{1}{8} } } = 3.62

Using the p-value approach, the decision rule is

If p-value ≤ α, reject the null hypothesis

If p-value > α, do not reject the null hypothesis

The p-value for this test is 0.00024, it is less than the level of significance, so the decision is to reject the null hypothesis.

This means that at a 5% significance level you can conclude that the average force experienced on the hand after a one-handed backhand drive for advanced players is greater than the average force experienced on the hand after a one-handed backhand drive for intermediate players.

I hope this helps!

3 0
3 years ago
Find where the lines go, the answer to the riddle is seven up every morning i just need to know where the lines go!!!! will give
postnew [5]

Answer:

Here’s what I got for this worksheet.

Step-by-step explanation:

6 0
2 years ago
Identify the zeros of the function f(x) =2x^2 − 2x + 13 using the Quadratic Formula. SHOW YOUR WORK PLEASE!!
Blababa [14]

Answer:

the answer is 13

Step-by-step explanation:

this is the answer I got if its not it then give me some answer choices

5 0
4 years ago
The fifth grade classes at Stonyville School use 5 identical buses to go on a field trip. There were a total of 40 seats on each
Maurinko [17]
There were 4 adults that went on the field trip.

5 0
3 years ago
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