As described in z-distribution the answers are given below:
a) The 95% confidence interval estimate for the population mean spending by a customer on visiting salon per month is given as follows: (747, 853).
b) The sampling error at 95% confidence level is of: $35.78.
What is a z-distribution ?
The normal distribution with a mean of 0 and a standard deviation of 1 is referred to as the standard normal distribution (also known as the Z distribution) (the green curves in the plots to the right). It is frequently referred to as the bell curve since the probability density graph resembles a bell.
solution:
The bounds of the confidence interval are given as follows:
In which:
is the sample mean.
z is the critical value.
n is the sample size. is the standard deviation for the population.
The parameters for this problem are given as follows:
Hence the lower bound of the interval is of:
800 - 200 x 1.96/square root of 55 = 747.
The upper bound of the interval is of:
800 + 200 x 1.96/square root of 55 = 853.
The sampling error for a sample size of 120 is calculated as follows:
200 x 1.96/square root of 120 = $35.78.
To learn more about the z-distribution from the given link
brainly.com/question/4079902
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Answer:
a)12 b)12 c)36
Step-by-step explanation:
a)find least common multiple. the number of marbles is that number * n (where n is an integer)
b) the least common multiple. it is 4*3=...
c)12*3 =?
then just divide by 2,3,4 to get answer
Answer:
800. is the answer
Step-by-step explanation:
ur welcome.
Answer:
A, B, D, and E
Step-by-step explanation:
First, you should know that definition.
<em><u>Congruent:</u></em> Identical in form, symmetrical.
Now that we have the definition, Let's compare each option.
<em><u>A.</u></em> Line segment BC and PO are a congruent pair.
<em><u>B.</u></em> Line segment IJ and LM are a congruent pair.
<em><u>C.</u></em> Line segment PO and ON are not a congruent pair
<em><u>D.</u></em> Line segment HV and GW are a congruent pair.
<em><u>E.</u></em> Line segment AB and AP are a congruent pair.
<h2><em>
<u>Hence, Options A, B, D, and E are correct.</u></em></h2><h2><em>
<u /></em></h2><h3>Hope this helps! </h3><h3 />
-Emma
open circle means less than or greater than (NO EQUALS)
line to the left means less than
x< 2
Choice A
closed circle means less than or equal to or greater than or equal to
line to the left means less than
x<=-4.25
Choice B