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Part I Exam Review
Part I Exam Review
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A #statistics quiz that reviews #ch1Bock
Flashcards
25 cards
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Practice quiz
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Questions
25
Answers
1
The mean grade on an exam was a 72 with a stdev of 6. If the teacher adds a 10 pt curve...
The new mean is 82 and the new StDev is 16
The mean is still 72 and the StDev is still 6
The new mean is still 72 and the new StDev is 16
The new mean is 82 and the StDev is still 6
2
The SPCA collects data on the dogs they house.ย Which of the following variables are categorical?
I only
I and III
I, II and III
I and II
3
What percentage of the labradors are male?
none of these
61.5%
16.2%
38.5%
4
What percent of Males had a Master's/Doctoral Degree?
2.3%
24.6%
4.6%
50%
5
The stemplot displays the 1988 per capita income (in hundreds of dollars)ย of the 50 states. Shape?
Symmetric distribution, median equal to mean
Skewed distribution, mean greater than median
Skewed distribution, median greater than mean
Symmetric distribution, mean greater than median
6
If the mean grade on an exam is 72 with a StDev of 6, &the teacher multiplies all scores by 1.5
The new mean is 108 and the stdev is still 6
The mean is still 72 and the StDev is still 6
The new mean is 108 and the StDev is 9
The new mean and StDev could not be determined
7
In any data set, if you increase the frequency of the mean, what happens to the st. deviation?
It increases
It decreases
It stays the same
You cannot tell
8
Noise level (in decibels) in a restaurant is ~N(30,4). 99% of the time it is below what value?
39.3
37.8
20.7
33.4
9
The time for an iPhone to move through an assembly line is ~N(3.4, 0.5). What is the probability it takes 3 to 4 hrs?
0.2295
0.2119
0.3270
0.6730
10
The amount of time required for 100 mice to navigate through a maze was recorded. Estimate the standard deviation.
2.5
50
20
10
11
If 75% of all families spend more than $75 weekly for food, while 15% spend more than $150, what is the mean?
๐ = 83.33, ๐ = 12.44
๐ = 106.26, ๐ = 21.85
๐ = 118.52, ๐ = 56.26
๐ = 104.39, ๐ = 43.86
12
Given the first type of plot, which of the following second plots could not always be generated from the first?
dot plot --> histogram
histogram --> stem plot
stem plot --> dot plot
dot plot --> box plot
13
The histogram shows wait times for 175 patients at a dentist office. Estimate mean and median
mean = 8; median = 4
mean = 7; median = 9
mean = 13; median = 11
mean = 9; median = 7
14
Which measure of center should be used if the data has outliers?
mode
mean
midrange
median
15
Does the dogs' breed appear to be independent of the dogs' sex?
No
Yes
16
What percentage of the dogs are male?
17.9%
41.3%
58.7%
31.1%
17
Data was collected on 5000 adults.ย Which is most likely to be bimodal?
Number ofcigarettes smoked daily
Eye color
Number of TV sets at home
Number of siblings
18
How much does the CEO earn?
$189,000
$225,750
$193,500
$251,500
19
Which has the larger mean and which has the larger standard deviation?
Largermean b; larger standard deviation b
Largermean a; larger standard deviation a
Larger mean a; larger standard deviation b
Largermean b; larger standard deviation a
20
Here are the summary statistics for the weekly payroll for Michael Scott Paper Company. What is the Q3?
$950
$1050
$800
$700
21
If the unmodified boxplot was switched to a modified boxplot, how many outliers would there be?
at least one
zero
one
at least two
22
Fuel economy in MPG is normally distributed. If the Honda Civic Hybrid has a z-score of +2.9...
Gets 2.9 times the gas mileage of the average car
It gets 2.9 miles per gallon more than the average car
Has a fuel economy that is 2.9 st. devs better than average
Have a standard deviation of 2.9 mpg
23
Paulineโs SAT Math score was a 650 and her ACT Math score was a 27.ย Which score is more impressive?ย
They are equally impressive
It cannot be determined
SAT
ACT
24
Which data set(s) have the smallest standard deviation
A only
A and B and C are equally small
B only
A and B are equally small
25
The ogive below shows the heights (in cm) of 200 students. Approx the median height
186
210
172
160
