foot putts by amateur golfers found 696 made putts.
a.
Estimate the proportion of made 6foot putts by professional
golfers. Estimate the proportion of made 6foot putts by amateur
golfers (to 2 decimals).
Professional golfers P1=
.64
Amateur golfers P2= 796 / 1200 =
.58
b.
Which group had a better putting accuracy?
professional
c.
What is the point estimate of the difference between the
proportions of the two populations (to 2 decimals)?
.
02 to .1
I used 2prop2int calculation in ti84.
Statcalc2propinterval
What does this estimate tell you about the percentage of putts
made by the two groups of golfers?
 Select your answer Professional golfers make 6% more 6foot
putts than the very best amateur golfersamateur golfers make 6%
more 6foot putts than the very best Professional golfersItem 5
d.
What is the 95% confidence interval for the difference
between the two population proportions? Interpret his confidence
interval in terms of the percentage of putts made by the two
groups of golfers (to 2 decimals).
( , )
17. Adecco Workplace Insights Survey sampled men and women
workers and asked if they expected to get a raise or promotion this
year (
USA Today
, February 16, 2012). Suppose the survey sampled 200
men and 200 women. If 104 of the men replied yes and 74 of the
women replied yes, are the results statistically significant in that you
can conclude a greater proportion of men are expecting to get a raise
or a promotion this year?
a.
State the hypothesis test in terms of the population proportion of
men and the population proportion of women?
H
0
:
p
1

p
2
–
less than or equal to 0
H
a
:
p
1

p
2
–
greater than 0
b.
What is the sample proportion for men? Round your answer to two
decimal places.
104/200 = .52
What is the sample proportion for women? Round your answer to two
decimal places.
74 / 200= .37
c.
Use a .01 level of significance. What is the
p
value? Round your
answer to four decimal places.
.0013
Chicago O'Hare and Atlanta HartsfieldJackson are the two busiest
airports in the United States. The congestion often leads to delayed
flight arrivals as well as delayed flight departures. The Bureau of
Transportation tracks the ontime and delayed performance at major
airports (
Travel & Leisure
, November 2006). A flight is considered
delayed if it is more than 15 minutes behind schedule. The following
sample data show the delayed departures at Chicago O'Hare and
Atlanta HartsfieldJackson airports.
Excel File:
data1033.xls
a.
State the hypotheses that can be used to determine whether the
population proportions of delayed departures differ at these two
airports.
H
0
:
p
1 
p
2  Select your answer greater than 0greater than or
equal
to
0less than 0less than or equal to 0equal to 0not equal to 0Item 1
H
a
:
p
1 
p
2  Select your answer greater than 0greater than or equal to
0less than 0less than or equal to 0equal to
0not equal to
0Item 2
b.
What is the point estimate of the proportion of flights that have
delayed departures at Chicago O'Hare (to 2 decimals)?
.28
c.
What is the point estimate of the proportion of flights that have
delayed departures at Atlanta HartsfieldJackson (to 2 decimals)?
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 Statistics, Standard Deviation, Chapter 10, Null hypothesis, Statistical hypothesis testing, Cengage Learning, Cengage Now, Cengagenowchapter10, Cengagech10