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MrRa [10]
3 years ago
11

Hey there! This is my last math question of the day! Please, do me a favor and help me out! Please remember I need an inequality

for this answer! Thanks!

Mathematics
1 answer:
Mars2501 [29]3 years ago
6 0

Answer:

150 ≥ 55+0.20t

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Head movement evaluations are important because disabled individuals may be able to operate communications aids using head motio
earnstyle [38]

Answer:

t=\frac{\bar d -0}{\frac{s_d}{\sqrt{n}}}=\frac{1.307 -0}{\frac{7.798}{\sqrt{14}}}=0.6271

df=n-1=14-1=13

p_v =P(t_{(13)}>0.6271) =0.2707

Step-by-step explanation:

A paired t-test is used to compare two population means where you have two samples in  which observations in one sample can be paired with observations in the other sample. For example  if we have Before-and-after observations (This problem) we can use it.  

Let put some notation  

x=test value CL , y = test value CO

x: 57.8 35.7 54.5 56.8 51.1 70.8 77.3 51.6 54.7 63.6 59.2 59.2 55.8 38.5

y: 44.7 52.1 60.2 52.7 47.2 65.6 71.4 48.8 53.1 66.3 59.8 47.5 64.5 34.4

The system of hypothesis for this case are:

Null hypothesis: \mu_x- \mu_y \leq 0

Alternative hypothesis: \mu_x -\mu_y >0

The first step is calculate the difference d_i=x_i-y_i and we obtain this:

d: 13.1, -16.4,-5.7,4.1,3.9,5.2,5.9,2.8,1.6,-2.7,-0.6,11.7,-8.7,4.1

The second step is calculate the mean difference  

\bar d= \frac{\sum_{i=1}^n d_i}{n}= \frac{29}{8}=1.307

The third step would be calculate the standard deviation for the differences, and we got:

s_d =\frac{\sum_{i=1}^n (d_i -\bar d)^2}{n-1} =7.798

The 4 step is calculate the statistic given by :

t=\frac{\bar d -0}{\frac{s_d}{\sqrt{n}}}=\frac{1.307 -0}{\frac{7.798}{\sqrt{14}}}=0.6271

The next step is calculate the degrees of freedom given by:

df=n-1=14-1=13

Now we can calculate the p value, since we have a right tailed test the p value is given by:

p_v =P(t_{(13)}>0.6271) =0.2707

So the p value is higher than the significance level provided of 0.01, so then we can conclude that we FAIL to reject the null hypothesis that the difference mean between after and before is higher or equal than 0. So we can't conclude that the mean neck rotation is greater in the clockwise direction than in the counterclockwise direction at 1% of significance.

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3 years ago
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Answer:

Step-by-step explanation:

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Amena wants to show the distribution of the data.

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Hope this helps :)
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