Answer:
Yes the conclusion in the question is a reasonable conclusion
Step-by-step explanation:
From the question we are told that
The sample size is
The sample mean for USA is ![\= x_1 = 391 \ minutes](https://tex.z-dn.net/?f=%5C%3D%20x_1%20%3D%20%20391%20%5C%20minutes)
The sample mean for Mexico is ![\= x_2 = 426 \ minutes](https://tex.z-dn.net/?f=%5C%3D%20x_2%20%3D%20426%20%5C%20minutes)
The sample standard deviation for USA is ![s_1 = 25 \ minutes](https://tex.z-dn.net/?f=s_1%20%3D%20%2025%20%5C%20minutes)
The sample standard deviation for Mexico is ![s_2 = 49 \ minutes](https://tex.z-dn.net/?f=s_2%20%3D%20%2049%20%5C%20%20minutes)
The null hypothesis is ![H_o : \mu_1 = \mu_2](https://tex.z-dn.net/?f=H_o%20%20%3A%20%20%5Cmu_1%20%3D%20%5Cmu_2)
The alternative hypothesis is ![H_a : \mu_1 < \mu_2](https://tex.z-dn.net/?f=H_a%20%20%3A%20%20%5Cmu_1%20%20%3C%20%5Cmu_2)
Generally the test statistics is mathematically represented as
![z = \frac{\= x_1 - \= x_2 }{ \sqrt{ \frac{s_1^2}{n_1} + \frac{s_2^2}{n_2 } } }](https://tex.z-dn.net/?f=z%20%3D%20%20%5Cfrac%7B%5C%3D%20x_1%20-%20%5C%3D%20x_2%20%7D%7B%20%5Csqrt%7B%20%5Cfrac%7Bs_1%5E2%7D%7Bn_1%7D%20%2B%20%5Cfrac%7Bs_2%5E2%7D%7Bn_2%20%7D%20%7D%20%7D)
=> ![z = \frac{ 391 - 426 }{ \sqrt{ \frac{25^2}{250} + \frac{49^2}{250} } }](https://tex.z-dn.net/?f=z%20%3D%20%20%5Cfrac%7B%20391%20%20-%20426%20%20%7D%7B%20%5Csqrt%7B%20%5Cfrac%7B25%5E2%7D%7B250%7D%20%2B%20%5Cfrac%7B49%5E2%7D%7B250%7D%20%7D%20%7D)
=> ![z = -10](https://tex.z-dn.net/?f=z%20%3D%20%20-10)
From the z table the area under the normal curve to the left corresponding to -10 is
![p-value = P(Z < -10 ) = 0.00](https://tex.z-dn.net/?f=p-value%20%3D%20%20P%28Z%20%3C%20%20-10%20%29%20%3D%20%200.00)
Generally from the value obtained we see that
The p-value is <
hence
The decision rule is
Reject the null hypothesis
The conclusion is
The is sufficient evidence to conclude that adults in the United States get less sleep on work nights than adults in Mexico
Hence the conclusion in the question is a reasonable conclusion
Answer:
exp prob is less than theoret prob
Step-by-step explanation:
experimental 8 out of 20 8/20
theoretical 10 out of 20 10/20
Answer:
I don't really understand this question
But if it's asking you to switch,
1. r = 2.5
2. r = 12
3. d = 34
Answer:
4 to the -4 power
Step-by-step explanation:
multiply the 4's and add the exponents. then divide by 4 and divide by that exponent