Answer:
x = 9
y = -10
Step-by-step explanation:
Answer:
The test statistic
Step-by-step explanation:
<u>Explanation</u>:-
Let x₁⁻ be the mean of the sample of size n₁ from a population mean μ₁ and standard deviation 'σ₁
Let x₂⁻ be the mean of the sample of size n₂ from a population mean μ₂ and standard deviation 'σ₂'
Null hypothesis : H0:μ₁ = μ₂
Alternative hypothesis : H1:μ₁ ≠μ₂
To test whether there is any significant difference between x₁⁻ and x₂⁻ we have use test statistic
Here
- x₁⁻ be the mean of the first sample
- x₂⁻ be the mean of the second sample
- 'σ₁' be standard deviation first population.
- 'σ₂' be standard deviation second population.
It would be the fourth option - <span>The survey could be biased because people exiting an Italian restaurant might favor Italian food.
The survey is clearly biased because Sonya is selecting </span>a sample that isn't representative of the entire population. Surveying every tenth person exiting the restaurant isn't a problem since it's a type of <span>systematic sampling.</span>
Answer:
4.5
Step-by-step explanation:
Step 1. Turn the second fraction (the one you want to divide by) upside down
(this is now a reciprocal).
Step 2. Multiply the first fraction by that reciprocal
Step 3. Simplify the fraction (if needed)
Answer:
b
Step-by-step explanation: