Waiting times? (in minutes) of customers at a bank where all customers enter a s
ID: 3376682 • Letter: W
Question
Waiting times? (in minutes) of customers at a bank where all customers enter a single waiting line and a bank where customers wait in individual lines at three different teller windows are listed below. Find the coefficient of variation for each of the two sets of? data, then compare the variation.
Bank A? (single line
6.4
6.5
6.6
6.8
7.2
7.2
7.3
7.7
7.7
7.8
Bank B? (individual lines):
4.4
5.3
5.9
6.1
6.6
7.7
7.7
8.5
9.3
9.6
The coefficient of variation for the waiting times at Bank A is
?%.
?(Round to two decimal places as? needed.)
The coefficient of variation for the waiting times at the Bank B is
%.
?(Round to two decimal places as? needed.)
Is there a difference in variation between the two data? sets?
A.
The waiting times at Bank B have considerably less variation than the waiting times at Bank A.
B.
The waiting times at Bank A have considerably less variation than the waiting times at Bank B.
C.
There is no significant difference in the variations.
Find the standard deviation of sample data summarized in a frequency distribution table by using the formula? below, where x represents the class midpoint and f represents the class frequency.
sequals=StartRoot StartFraction n left bracket Summation from nothing to nothing left parenthesis f times x squared right parenthesis right bracket minus left bracket Summation from nothing to nothing left parenthesis f times x right parenthesis right bracket squared Over n left parenthesis n minus 1 right parenthesis EndFraction EndRootn?f•x2??(f•x)2n(n?1)
standard deviation for frequency distribution
?(degrees°?F)
3535minus?4141
4242minus?4848
4949minus?5555
5656minus?6262
6363minus?6969
7070minus?7676
Frequency
11
33
88
77
55
11
sequals=
nothingdegrees°F ?(Round to one decimal place as? needed.)
A student earned grades of
Upper BB?,
Upper CC?,
Upper BB?,
Upper CC?,
and
Upper BB.
Those courses had the corresponding numbers of credit hours
33?,
22?,
44?,
11?,
and
11.
The grading system assigns quality points to letter grades as? follows:
Aequals=?4;
Bequals=?3;
Cequals=?2;
Dequals=?1;
Fequals=0.
Compute the grade point average? (GPA) as a weighted mean and round the result with two decimal places. If the? Dean's list requires a GPA of 3.00 or? greater, did this student make the? Dean's list?
The grade point average is
nothing.
?(Round to two decimal places as? needed.)
Did this student make the? Dean's list?
A.
No because the students GPA is not 4.0
B.
NoNo
because the? student's GPA is
lessless
than 3.0
C.
Yes because at least two of the student grades are B or above
D.
No
because the student has at least one grade
lessless
than 3
Heights of men on a baseball team have a? bell-shaped distribution with a mean of
175 cm175 cm
and a standard deviation of
6 cm6 cm.
Using the empirical? rule, what is the approximate percentage of the men between the following? values?a.
163163
cm and
187187
cmb.
169169
cm and
181181
cm
a.
nothing?% of the men are between
163163
cm and
187187
cm.
?(Round to one decimal place as? needed.)
b.
nothing?% of the men are between
169169
cm and
181181
cm.
?(Round to one decimal place as? needed.)
Find the third quartile
Q3
of the list of 24 sorted values shown below.
30 35 36 36 39 39 41 42 43 43 44 50 55 58 58 58 60 64 66 68 71 71 77 7830 35 36 36 39 39 41 42 43 43 44 50 55 58 58 58 60 64 66 68 71 71 77 78
The third quartile
Q3
is
nothing. ?(Type an integer or a? decimal.)
Bank A? (single line
6.4
6.5
6.6
6.8
7.2
7.2
7.3
7.7
7.7
7.8
Bank B? (individual lines):
4.4
5.3
5.9
6.1
6.6
7.7
7.7
8.5
9.3
9.6
Explanation / Answer
> bank_a<-c(6.4,6.5,6.6,6.8,7.2,7.2,7.3,7.7,7.7,7.8);mean(bank_a);sd(bank_a);cv_bank_a=100*(sd(bank_a)/mean(bank_a));cv_bank_a
[1] 7.12
[1] 0.5223877
[1] 7.34
> bank_b<-c(4.4,5.3,5.9,6.1,6.6,7.7,7.7,8.5,9.3,9.6);mean(bank_b);sd(bank_b);cv_bank_b=100*(sd(bank_b)/mean(bank_b));cv_bank_b
[1] 7.11
[1] 1.731698
[1] 24.35
> isTRUE(cv_bank_a==cv_bank_b)
[1] FALSE
B.
The waiting times at Bank A have considerably less variation than the waiting times at Bank B.
is True .
As per chegg rule I just solved first four parts.
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