Answer:
The 90% confidence interval for the mean score of all takers of this test is between 59.92 and 64.08. The lower end is 59.92, and the upper end is 64.08.
Step-by-step explanation:
We have that to find our 
level, that is the subtraction of 1 by the confidence interval divided by 2. So:
Now, we have to find z in the Ztable as such z has a pvalue of 
.
So it is z with a pvalue of 
, so 
Now, find the margin of error M as such
In which 
is the standard deviation of the population and n is the size of the sample.
The lower end of the interval is the sample mean subtracted by M. So it is 62 - 2.08 = 59.92
The upper end of the interval is the sample mean added to M. So it is 62 + 2.08 = 64.08.
The 90% confidence interval for the mean score of all takers of this test is between 59.92 and 64.08. The lower end is 59.92, and the upper end is 64.08.
513 * 40 + 513 * 6= 2052 + 3078 = 5130
Answer:
step 1. A, B,D are incorrectly written as these are not all coordinates. they must be written (x, y)
step 2. so the question becomes is C a quadratic
step 3. The x values must be evenly spaced. the x values are evenly spaced by a difference of 4
step 4. write out the y values: -126, -14, 2, 18
step 5. write out the differences: 140, 16, 16
step 6. write out the differences: -124, 0.
step 7. after doing this twice the numbers nust be the same for this to be a quadratic which they aren't
step 8. C is not a quadratic.
Answer: A. 5,000 meters
Step-by-step explanation:
Starting with the smallest unit which is option C. There are 10 millimeters in one centimetre. Option c in centimeters is:
= 30,000 / 10
= 3,000 meters.
Option c is smaller than B and so is incorrect.
A meter is 100 centimeters. Option b in meters is;
= 6,000 / 100
= 60 meters
This is less than option A so is incorrect.
A kilometer is 1,000 meters so option A in meters is:
= 5,000 / 1,000
= 5 kilometers
This is higher than option d so option A is correct.
