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.
11+5=16 3x2= 6 8x1= 8 so add it together, 16 + 6 + 8 = 30.
Let x represent the shorter sides, then 2x + 1 would represent the longer sides. There are four short sides and two long sides. The perimeter is 162 cm. The equation: 4x + 2(2x + 1) = 162 4x + 8x + 2 = 162 8x + 2 = 162 Subtract 2 from both sides. 8x = 160 Divide both sides by 8. x = 20 The shorter sides are 20 cm in length. The longer sides are 2x + 1, or 41 cm in length. Check: 4 * 20 + 2 * 41 = 162 80 + 82 = 162 162 = 162, values check.
Answer:
Step-by-step explanation:
Area of a rectangle is length times width. Since a rectangle has four sides, there will be two sides that have the length size and two with the width. Anyway, now we need to find what numbers multiply together to make 35.
7 and 5 are the only whole numbers that multiply together to make 35, so those hve to be the length and width. So two sides opposite each other are going to be 7 cm and the other two are going to be 5 cm
Answer: z =2.22
Step-by-step explanation:first determine the constant. Z= K(X/Y) if z is 15, x is 6 and y is 2 then 15= K(6/2) then K is 5.
When x is 4 and y is 9 . k is 5 then
Z ,= 5(4/9) = 2.2.