Answer:
z-test.
Step-by-step explanation:
We want to perform an hypothesis test for a population mean.
In the case that the <u>standard deviation of the population is known</u> and the population distribution is normal, even if the sample is small, <u>we will use a z-test</u>.
The usual case is to not know the standard deviation of the population, in which case a t-test is adequate instead of a z-test, taking into account the degrees of freedom of the sample.
Answer:
<u><em>7 hours 30 minutes and 0 Seconds</em></u>
Step-by-step explanation:
- <em>60 minutes in 1 hour</em>
- <em>7:30 - 3:00</em>
- <em>60 * 10 = 600 Seconds</em>
- <em>Plus the 30 minutes which converts to 20 seconds</em>
- <em>Change that into hours and minutes</em>
Answer:
You will save $24.50
Step-by-step explanation:
because 35 x0.3= 10.50, therefore 35 - 10.50=24.50 the answer
Answer:
b. x² + 8x + 12 =
1. use the factoring X (see attachment)
2. 6 x 2 = 12; 6 + 2 = 12
3. (x + 6)(x + 2) = 0
4. x = -6, -2
c. x² + 13x + 12 =
1. 12 x 1 = 12; 12 + 1 = 13
2. (x + 12)(x + 1) = 0
3. x = -12, -1
c. x² + x - 12 =
1. 4 · (-3) = -12; 4 - 3 = 1
2. (x +4)(x - 3) = 0
3. x = -4, 3
f. x² + 15x + 36 =
1. 12 x 3 = 36; 12 + 3 = 15
2. (x + 12)(x + 3) = 0
3. x = -12, -3
hope this helps :)
Answer:
Step-by-step explanation:
<h3>Given</h3>
- Initial sales = 420
- Later sales = 360
<h3>Solution</h3>
<u>Drop in sales </u>
<u>Percentage drop </u>
