stud
bud
Sign up
Log in
Home
Library
Explore
SAT
More
Statistics Midterm Review Flashcards | StudBud
Explore
/
Statistics Midterm Review
Statistics Midterm Review
30 terms
·
StudBud Administration
·
51 plays
Chapter 1, 2 and 5
Flashcards
30 cards
F
Practice quiz
P
Host live
L
Questions
30
Answers
1
Kids watch µ=25 hours TV per week σ=8 Sample of 40 selected Find probability mean # watched<22
0.9911
0.6480
0.3520
0.0089
2
Identify the population: A survey of 500 adults in the U.S. found that 54% drink coffee daily.
Collection of the 500 adults surveyed
Collection of all adults in the U.S.
500
54%
3
IQ scores are normally distributed µ=100 σ=15. What IQ score represents the 98th percentile?
113
145
131
69
4
Find mode. Heights (in inches) of a sample of basketball players are: 79 80 81 78 84 78
78
79.5
78.5
79
5
Identify the sample: A survey of 500 adults in the U.S. found that 54% drink coffee daily.
Collection of all adults in the U.S.
500
Collection of the 500 adults surveyed
54%
6
The social security numbers of students in a class represent quantitative data.
True
False
7
Annual insurance premium µ=$1448 with σ=$175. Find z-score that corresponds to premium of $1250
1.71
1.13
-1.71
-1.13
8
Find the z-score that has 2.68% of the distribution’s area to its right.
z = 1.93
z = –0.0037
z = –1.93
z = 0.9963
9
Find the probability using the standard normal distribution. P(z ≥ –2.31)
0.9896
0.0104
0.9913
0.0087
10
Standard dev? Heights (in inches) of a sample of basketball players are: 79 80 81 78 84 78
4.8
6
2
2.3
11
IQ scores normally distributed µ=100 σ=15 Find probability randomly selected person has IQ >120
0.9082
0.6293
0.3707
0.0918
12
Find the probability using the standard normal distribution. P(–2.14 < z < 0.95)
0.1873
0.1170
0.8127
0.0681
13
Find the probability using the standard normal distribution. P(z < 1.49)
0.0681
0.6879
0.3121
0.9319
14
In the statement “A survey of 50 adults in U.S. found that 5% eat kale daily” 5% is a parameter
False
True
15
Identify the data set’s level of measurement: The nationality of each person on an airplane.
Nominal
Interval
Ratio
Ordinal
16
What is the minimum data entry?
38
41
9
96
17
Use correction for continuity to convert the probability of getting at least 80 successes.
x > 79.5
x < 79.5
x > 80.5
x < 80.5
18
Find the class width:
4
19
3
5
19
Estimate the frequency of the class with the greatest frequency.
53
58
21
28
20
Identify the data set’s level of measurement: The salaries of nurses at a hospital.
Nominal
Ordinal
Interval
Ratio
21
IQ scores norm. distributed µ=100 σ=15 Find prob. random person has IQ score between 100 & 120
0.9082
0.0918
0.4082
0.5918
22
Use the box-and-whisker plot to identify the second quartile.
26
24
10
18
23
Best method of data collection? Study of the effect of using Excel on grades in a stats course
Experiment
Observational study
Survey
Simulation
24
Population µ=80 σ=12 Samples of size 36 selected from population Describe sampling distribution
A
D
C
B
25
Identify the data set’s level of measurement: The IQ scores of students in a class.
Ordinal
Interval
Nominal
Ratio
26
Sampling Tech: Grads classified by major-20 picked from each major& asked how often use library
Cluster sample
Stratified sample
Random sample
Systematic sample
27
Find Mean: Heights (in inches) of a sample of basketball players are: 79 80 81 78 84 78
474
80
78
78.5
28
Annual insurance premium µ=$950 σ=$175 (bell-shape) Estimate % of premiums between $425 & $1475
75%
95%
99.7%
68%
29
Find median. Heights (in inches) of a sample of basketball players are: 79 80 81 78 84 78
79
79.5
78
78.5
30
The costs of items in a shopper’s grocery cart represent quantitative data.
False
True
