1. A survey of the number of calls received by a
sample of Southern Phone Company subscribers last week revealed the following
52, 43, 30, 38, 30, 42, 12,
46, 39, 37, 34, 46, 32, 18, 41, 5
a) Develop a stem-and-leaf chart. Note: A typical row for the Stem & Leaf
plot might look like 3Ãª0269. Where,
the vertical line is obtained by using â€œShift & |â€ key. The line is
inserted at the location of the cursor.
b) What basic conclusions can
be drawn from this chart?
c) Compute the 5 number System
for this data set and list Xmin, Q1, Q2, Q3 & Xmax. See Videos â€œ5_Number_Sysytemâ€in Videos â€“Topics In Stat 230.
2. The chart below gives the
percentage of counties in the US that use various methods for recording votes
in 1980 & 2002. Set up side-by-side
bar charts by year using the instruction for Side-By-Side Charts in the Class
Notes Conference. Copy/Paste your Chart
into the TFE Editor from EXCEL.
3. The following are a sample
of the weights of nine jars of peanut butter.
7.69, 7.72, 7.80, 7.86, 7.90, 7.94, 7.97, 8.06, 8.09
a) Compute the median weight.
b) Compute the standard
deviation of the sample using the shortcut formula. Show the formula and values for each term and compute the answer. Use the TFE Equation Editor.
c) Compute the 5 Number System for this data. Just list the values as Xmin=xxx,
Q1=xxx,Q2=xxxx,Q3=xxxxx, Xmax = xxxx.
d) Are there outliers? An
outlier value is defined as unusually large or small according to the
expressions: Answer yes or no.
Outlier > Q3 + 1.5(Q3-Q1) or,
Outlier < Q1-1.5(Q3-Q1) (20 %) 4. Answer questions a. through f. of 3.23 below. NOTE: The Bienayme-Chebyshev Rule is the same as the Chebyshevâ€™s Rule in Table 2.6 of your text. .gif">
5. Compute the mean and standard deviation for
the data in the table below. State your assumptions and show all calculations.
0 to 5
5 to 10
10 to 15
15 to 20
20 to 25
6. A box
contains 3 red balls and 4 green balls.
If two balls are randomly selected in sequence, without replacement, what is the possibility that a red ball and a
green ball are picked out of the box. State the rule for P(A&B) and then
substitute the values and compute the answer.