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AP Stats TPS Ch 1-5 Flashcards | StudBud
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AP Stats TPS Ch 1-5
AP Stats TPS Ch 1-5
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Answers
1
The correlation coefficient is unitless.
False
True
2
A distribution for basketball scores is N(70,25) What proportion of scores are greater than 40?
.6754
.8630
.8849
.2222
3
A five number summary includes all of the following except...
Q1 & Q3
Maximum
Standard Deviation
Minimum
4
A histogram that is described to be unimodal means...
Has 2 distinctive peaks
Has 1 distinctive peak
Has no peaks
There are gaps
5
What other type of graphical display is appropriate for test scores, other than a histogram?
Stemplot
Scatterplot
Pie Chart
A table
6
Mean:68.8in & Standard Deviation:2.2in. What range of heights will put males in the middle 50%?
70.461"-71.874"
68.558"-69.102"
67.126"-70.074"
54.26"-58.323"
7
What is the response variable in the problem below?
Number of guns owned
Whether or not gun ownership is required by law
Number of burglaries committed
How small the town was in which the crime was committed
8
The Standard Normal Curve has an area of 1 underneath it.
False
True
9
An analysis of crude oil price and gas prices at the pump found a corr coefficient of .829.True
every $1 increase in crude oil, gas price increases $.829
68.7% of the price of gas is explained by crude oil price
None
linear relationship between crude oil and pump prices
10
weatherman's end of year analysis gave z-score of 2.8 for the past year's temperatures.Meaning?
past year's temp has st dev of 2.8
year's ave temp was 2.8 st dev above historical mean
year's ave temp was 2.8 degrees higher than historical mean
past year's ave temp was 2.8% higher than historical
11
Rental values of apartments close to the city are 470,600,580,550. State the standard deviation
$49.50
$58.07
$100.00
$31.15
12
What direction are residuals measured in?
Vertical
All the above
Diagonal
Horizontal
13
Which of the following represents a Quantitative Variable?
The hair color of everyone in your class
The heights of everyone in your class
The eye color of everyone in your class
Area code
14
A company records temps, then subtracts 70 from each value. What will change?
mean and median
standart deviation and IQR
median and IQR
mean and standard deviatio
15
What four things should be discussed when describing a scatterplot?
Form,strength,height,direction
Height, length,shape,form
Form, strength, direction,outliers
Form,strength,shape,outliers
16
Least sq reg line using HS GPA to predict college GPA y=0.22+.72x Find resid HS 3.8 fresh 3.5
.844
-.844
.544
-.544
17
SAT Math Scores at WHS: Mean:610, Standard Deviation:60. What is the range in the middle 68%?
200-260
430-480
550-670
610-700
18
Mean tree ht 3.2 ft w/ st dev.6ft. If the dist approx normal, what % of trees are 4 to4.4 ft?
11%
2%
7%
9%
19
What is the equation of the least-squares regression line for predicting GPA from IQ?
ŷ=3.55+.101x
ŷ=-3.55+.101x
ŷ=-3.55+1.01x
ŷ=-2.34+.101x
20
In drawing a histogram, which of the following suggestions should be followed?
The bars need to be color coded
Leave large gaps between the bars
The bars should be square
The heights of the bars should equal the class frequency
21
When a distribution is skewed, is the mean resistant?
No, it gets pulled in the direction of the "tail"
No, it gets pulled in the direction of the peak
Yes, it does not get pulled
Only when the distribution is skewed right
22
What is the difference between outliers and influential points?
Outliers change slope and influential points do not
There is no difference
Outliers move line up & down,influential points change slope
Outliers change slope, influential points move line
23
What is the mean for this set of data? 5,12,13,15,18,19,30,6,20
15.33
15.77
24.65
12
24
The form of the relationship in the scatterplot below can be described as
Negative association
Extreme association
Positive association
No association
25
Which best describes a block?
random sample of a population who serve as subjects in exper
any of diff groups randomly selected in stratified sample
any subgroup of the subjects in an experiment
subgroup of exper subjs are same w/ regard to some variation
