6. You are constructing a 90% confidence interval for a sample consisting of n = 9 values and an

unknown population standard deviation. The population appears to be very skewed. Determine

whether a margin of error should be calculated using a critical value of za/2, a critical value of ta/2, or neither.

a) a critical value of za/2

b) a critical value of ta/2

c) neither

7. The standard deviation of sample size of n = 15 is 345 and the mean is 6784. Given that the population follows a normal distribution, construct a 90% confidence interval estimate of the mean of the population.

a) 6519

b) 6593

c) 6627

d)6783

i dont know sorry

step-by-step explanation:

for the friend request.

when a figure, such as triangle (xyz) is reflected over the line y = x to create x'y'z' the x-coordinates and y-coordinates of the original image (pre-image) will be reversed for the image. (e.g., (x, y) > (y, x)) this means that the pre-image position of the x- and y-coordinates switch places which in turn provides a mirror like image of the original xyz.  

i notice that when i draw a line segment from x to x', that the points are parallel from each other -- they are exactly across from each other and do not intersect with any other points.  

yes, think i would see the same characteristic if you drew the line segment connecting y with the reflecting line and then y' with the reflecting line because of the essence of reflections. because it is a mirror image, each point was effected the same way which leads me to conclude that they same would apply to y and y'.

step-by-step explanation:

a and d