Answer:
d. The population standard deviation is known.
Step-by-step explanation:
T-distribution or Z-distribution, which to use?
If we have the population standard deviation is known, we use the z-distribution.
Otherwise, if we only have the standard deviation for the sample, we use the t-distribution.
Which of the following is not appropriate to use the t-confidence interval for
When the population standard deviation is known, so letter d.
Answer:
Then the total area is 116 cm^2 which agrees with answer D
Step-by-step explanation:
Notice we need to calculate the area of two rectangles (one larger at the bottom and a smaller one on top)
The Area of a rectangle is the product: base x height
In our case :
Area of Big rectangle = 12 cm x 7 cm = 84 cm^2
Area of smaller rectangle = 8 cm x 4 cm = 32 cm^2
Then the total area is: 84 cm^2 + 32 cm^2 = 116 cm^2
Answer:1.17
Step-by-step explanation:
Answer:
x = -5
Step-by-step explanation:
Find the gradient:
- m = change in y ÷ change in x
- m = (7 - -7) ÷ (-5 - -5)
- m = 14 ÷ 0
- m = 0 - There is no gradient, and it is a vertical line
The equation is x = -5, because in both co-ordinate pairs, the x is -5 - only the y changes
Hope this helps!
