Transcript 1st 9 weeks test review

Review Multiple Choice
Chapters 1-10
1)The average number of days absent per student per
year at West Valley School is 19 days with a standard
deviation of 4 days. How many standard deviations
from the mean is of 3 absent days?
(A) About 5.00 standard deviations above the mean
(B) About 4.00 standard deviations above the mean
(C) About 4.00 standard deviations below the mean
(D) About 5.00 standard deviations below the mean
(E) About 1.33 standard deviations above the mean
2) On a recent English exam, if 20% of scores fell below
60 points and the standard deviation is 6.0, find the
mean score (assuming the Normal model is
appropriate).
A)1.2
B) 65.04
D) 12
E) 66
C) -54.96
3) Here are some statistics for the annual Wildcat golf
tournament lowest mean median = 105, range = 90,
IQR = 102, standard Suppose it was very windy and
all the golfers' scores went up by 7 strokes. Tell the new
value for each of the summary statistics.
A) Lowest score 67, mean 104, median 112, range 83, IQR 109, Q1 46, SD 17
B) Lowest score 67, mean 104, median 112, range 90, IQR 102, Q1 46, SD 17
C) Lowest score 67, mean 97, median 105, range 83, IQR 102, Q1 46, SD 17
D) Lowest score 67, mean 104, median 112, range 83, IQR 102, Q1 46, SD 17
E) Lowest score 67, mean 104, median 112, range 83, IQR 102, Q1 46, SD 24
4) Last weekend police ticketed 18 men whose mean speed was
72 miles per hour, and 30 women going an average of 64 mph.
Overall, what was the mean speed of all the people ticketed?
A)68 mph
B) 67 mph
D) Cannot be determined
C) 69 mph
5) For a recent English exam, use the Normal model N(73, 9.2) to
find the percent of scores over 85. Round to the nearest tenth of a
percent.
A)88.5%
B) 90.3%
C) 11.5%
D) 8.1%
E) 9.7%
6) Your Stats teacher tells you your test score was the 3rd
quartile for the class. Which is true?
I. You got 75% on the test.
II. You can't really tell what this means without knowing the
standard deviation.
III. You can't really tell what this means unless the class
distribution is nearly Normal.
A)II only
B) II and III
C) I only
D) III only
E) None of these
26) Which of the following summaries are changed by
adding a constant to each data value?
I. the mean
II. the median
III. the standard deviation
A) I and II
B) I, II and III
C) I only
D) III only
E) I and III
The test scores of 15 students are listed below.
35
68
79
57
71
82
51
72
87
65
75
90
67
77
99
Identify potential outliers, if there are any.
A)35, 57
B) 35
D) 35, 99
E) None
C) 99
9) The relationship between the number of games won by a minor
league baseball team and the average attendance at their home
games is analyzed. A regression analysis to predict the average
attendance from the number of games won gives the model wins.
The Buckley Bobcats averaged 4632 fans at each game. They
won 41 times. Calculate the residual and explain what it means.
A) -922 people. The Buckley Bobcats averaged 922 less fans than would be
predicted for a team with 41 wins.
B) 14,986 people. The Buckley Bobcats averaged 14,986 less fans than
would be predicted for a team with 41 wins.
C) 4619 people. On average the Buckley Bobcats will have 4619 extra people.
D) 5554 people. The Buckley Bobcats were expected to average 5554 people for
each game.
E) 922 people. The Buckley Bobcats averaged 922 more fans than would be
predicted for a team with 41 wins.
10) If the point in the upper left corner of the scatterplot is
removed, what will happen to the correlation (r) and the
slope of the line of best fit (b)?
A) Both will increase.
B) r will decrease and b will increase
C) r will increase and b will decrease.
D) Both will decrease.
E) They will not change.
1)C
2) B
3) B
4) B
5) E
6) E
7) A
10) A
8) B
9) A