Make sure you show all work/reasoning - that is select
an answer and justify it.
- If the pond lily population doubles everyday and it takes 30 days to completely cover a pond, on what day will the pond be 1/4 covered?
- day 4
- day 8
- day 15
- day 20
- day 28
- On what day will the pond be 1/2 covered?
- day 15
- day 20
- day 25
- day 28
- day 29
- The amount of lillies produced between day 29 and day 30 is
- equal to the entire amount of lillies produced previously
- is twice as large as that produced between day 14 and day 15
- about the same as produced between day 28 and day 29
- the same as between any 2 days since the growth rate is
constant
- A different dilly pond has the same doubling time for the pond lily population as the previous pond but has a pond coverage
time of 16 days. On approximately what day is 10% of this pond covered?
- day 1
- day 2
- day 5
- day 9
- day 13
- The current population of Eugene is 140,000 people. If the population
growth rate remains at 4% per year, approximately when will the city
of Eugene have 500,000 people? (show your work)
- Based on the last 300 UO Duck football games, the average points
scored by the opposition was 23 points with a dispersion of 7 points.
Therefore,
2/3 of the time that you attend a duck football game you would expect
the opposition to score between
- 23 and 30 points
- 16 and 23 points
- 16 and 30 points
- 23 and 37 points
- insufficient information to know
- Based on the Duck football game data, a 1 in 100 scoring event
by the opposition would be
- more than 23 points
- more than 30 points
- more than 37 points
- more than 41 points
- more than 45 points
- The Columbia River near Pasco has had about 100 years worth of flood
measurements made. Those data indicate a mean flood level of 9.0 feet
with a dispersion of 5.0 feet around that mean flood level. Based on this data. what level above this average flood level would correspond to a 1 in a 1000 year flood event?
- 9.0 feet
- 14.0 feet
- 19.0 feet
- 24.0 feet
- can't tell from the data given
A survey of 25 gas stations in the Eugene Area showed an average
price for unleaded gas of $4.25 per gallon with a dispersion of
10 cents. Important note: 10 cents = 0.1$ - don't mix up your units for this question
A survey of 25 stations in the Portland area had an
average of $4.35 per gallon with a dispersion of 10 cents. A
survey of 50 stations in the Seattle area had an average of $4.30
per gallon with a dispersion of 21 cents.
- What is the probability that in Eugene you will pay more than
$4.45 per gallon?
1) 50% 2) 15% 3) 5% 4) 1% 5) .1 %
- What is the probability that in Portland you will pay more than
$4.45 per gallon?
1) 50% 2) 15% 3) 5% 4) 1% 5) .1 %
- Which location has the highest probability of paying $4.50 or more
per gallon.
1) Eugene 2) Portland 3) Seattle
- About how many gas stations would I have to go to in Eugene to find
a price of $4.00 per gallon?
1) 10 2) 25 3) 50 4) 100 5) 1000
- The difference in mean gas prices between Eugene and Portland is
1) not significant 2) marginally sig. 3) sig. 4) highly sig
- The following data represent the average GPA of UO
Students as a function of year.
Part A)
Use the Z-test as described in the lecture material and divide the data into two
halves and and calculate the Z-statistic.
Part B)
The dispersion around around the 1972 GPA was 0.7 and the dispersion around the 2011 GPA was 0.6. Determine the percentage of students whose GPA was above 3.5 in 1972 compared to 2011.
Part C)
Using these results (and not your personal opinion), argue whether or not grade inflation is significant at the UO.
The Data:
1972 2.43
1973 2.44
1974 2.45
1975 2.44
1976 2.47
1977 2.48
1978 2.5
1979 2.52
1980 2.56
1981 2.58
1982 2.58
1983 2.58
1984 2.57
1985 2.6
1986 2.6
1987 2.59
1988 2.58
1989 2.6
1990 2.64
1991 2.66
1992 2.74
1993 2.76
1994 2.79
1995 2.78
1996 2.8
1997 2.82
1998 2.84
1999 2.79
2000 2.82
2001 2.85
2002 2.87
2003 2.89
2004 2.91
2005 2.9
2006 2.93
2007 2.94
2008 2.96
2009 2.97
2010 3.01
2011 3.03