Answer:
<em>H₀</em>: <em>μ</em>₁ - <em>μ</em>₂ = 0 vs. <em>Hₐ</em>: <em>μ</em>₁ - <em>μ</em>₂ > 0.
Step-by-step explanation:
A test is to be performed to determine whether the average sales are higher in stores where customers are approached by salespeople than in stores where they aren't.
A two-sample test can be used to determine whether there is a significant difference between the sales of the stores where the customers are approached by salespeople and the stores where the customers are not approached by salespeople.
We can either use the <em>z</em>-test or <em>t</em>-test. If the population standard deviation for the sales of the two stores are given then we will use the <em>z</em>-test. And if not then the <em>t</em>-test will be used.
1 : group of stores where customers are approached by salespeople
2 : group of stores where customers are not approached by salespeople
The hypothesis can be defined as follows:
<em>H₀</em>: There is no difference between the average sales of the two stores, i.e. <em>μ</em>₁ - <em>μ</em>₂ = 0.
<em>Hₐ</em>: The sales for the store 1 is higher than that for store 2, i.e. <em>μ</em>₁ - <em>μ</em>₂ > 0.
X=-3
2x=4x+6
-2x=6
Divide by -2
X=-3
Answer:
2/30
Step-by-step explanation:
1. 5 times a number(x). And the operation is multiplication
2. A number divided by 5. And the operation is division
3. A number plus 5. And the operation is addition
4. A number minus 5. And the operation is subtraction .
Answer:
1.5 cm/s
Step-by-step explanation:
The graph shows the speed of a worm as a relationship between the distance it can travel in centimeters over time, or seconds. Since the graph forms a straight line, then we know that the speed of the worm is constant over time, meaning that he will move the same distance each second. Given the point (6,9) on the graph, this tells us that the worm moved 9 centimeters in 6 seconds or:
So, the ratio of centimeters over seconds is 9/6. However, unit rate is the distance every second or putting the ratio over '1'. We can do this by diving the numerator by the denominator or 9 ÷ 6 = 1.5 centimers/second.
