Module 1 Quiz
Select the most appropriate response.
_ 1.
a)
b)
c)
d)
Which of the following correctly describes the relationship between a parameter and a statistic?
A statistic is calculated from sample data and is generally used to estimate a parameter.
Module 2 Quiz
Select the most appropriate response.
_ 1.
a)
b)
c)
d)
What is the set of all possible outcomes of a probability experiment?
compliment
Venn diagram
sample space
events
Select the most appropriate response.
_ 2.
a)
b)
c)
d)
If the computed p
Chapter 1
The Nature of Probability and
Statistics
Learn
.
- Knowledge of statistical terms
- Difference between two branches of statistics
- How to identify types of data
- Identify four basic sampling techniques
- Difference between observational and ex
STA 2023 Practice Final Exam
Name: _
All problems worth 2 points
1. (True or False)
_The number of students in a class is an example of a continuous
variable.
2. (True or False)
_A person's political party is an example of a qualitative variable.
3. (True
STA 2023 Practice Test #2
Name:_
All problems worth 5 points
_1) For the following set of numbers, determine if there are any outliers. You must show your
work for any credit.
10
20
30
500
12
1
_2) For the following set of numbers, find Q1, Q2, Q3
126
213
Practice Test #4 STAT 2023
1. According to US statistics, the average age of a high school graduate is now 18.5 years. A Department
of Education executive feels the age is lower than this A sample of 25 high school grads in New York
revealed that their av
What you need to know for test #1
1. Difference between qualitative and quantitative variables
2. Difference between discrete and continuous variables
3. Different sampling types cluster, random, stratified, systematic
4. Difference between experimental a
Practice STA 2023 Test #3 T
1) Using tables find (-1.14<z<2.18)
2) Find P(z>1.75)
3) Find P(-1.12<z<2.91)
4) Find P(z<-2.13)
5) Find P(X<150), when =17 and =147
6) During the month of July, the average temperatures in Tampa is 94. The standard
deviation i
Module 4 Quiz
Construct the requested confidence interval.
_ 1.
In a random sample of 60 computers, the mean repair cost was $150 with a standard deviation of $36.
Construct a 90% confidence interval for the population mean.
a)
($537, $654)
b)
($138, $162
Module 1 Quiz (Solutions)
Select the most appropriate response.
A
A
-l
1.
Which of the following correctly describes the relationship between a parameter and a statistic?
a)
b)
c)
d)
A statistic is calculated from sample data and is generally used to esti
Let X count the number of passengers that ride a commuter ferry on any given trip. The
distribution of X is unknown, but the mean is known to be x 125 and standard deviation is
known to be 15. If the number of passengers over 60 trips is counted, answer t
Let X count the number of passengers that ride a commuter ferry on any given trip. The
distribution of X is unknown, but the mean is known to be x 125 and standard deviation is
known to be 15. If the number of passengers over 60 trips is counted, answer t
Let X count the number of passengers that ride a commuter ferry on any given trip. The
distribution of X is unknown, but the mean is known to be x 125 and standard deviation is
known to be 15. If the number of passengers over 60 trips is counted, answer t
Let X count the number of passengers that ride a commuter ferry on any given trip. The
distribution of X is unknown, but the mean is known to be x 125 and standard deviation is
known to be 15. If the number of passengers over 60 trips is counted, answer t
Let X count the number of passengers that ride a commuter ferry on any given trip. The
distribution of X is unknown, but the mean is known to be x 125 and standard deviation is
known to be 15. If the number of passengers over 60 trips is counted, answer t
1. A population has a mean of 50 and a standard deviation of 6. (a) What are
the mean and standard deviation of the sampling distribution of the mean for
N = 16? (b) What are the mean and standard deviation of the sampling
distribution of the mean for N =
1. A bottling company uses a filling machine to fill plastic bottles with a popular cola. The bottles
are supposed to contain 300 milliliters. In fact, the contents vary according to a normal
distribution with mean = 298 ml and standard deviation ) = 3 ml
Sampling Distribution Practice Problems
1. The company JCrew advertises that 95% of its online orders ship within two working days.
You select a random sample of 200 of the 10,000 orders received over the past month to audit.
The audit reveals that 180 of
5. Use the standard scores to determine who is eernearahl]r taller.
[A] The brother [B] The sister
6. In each case, describe what the zlseore of the observation represents.
T. Use the empirical rule to determine the percentage of females who are between 5
HW #7? Name:
Standard See-res
STA 23-23
Assume that male and female heights are normallyr distributed and that the average height for a male is T]
inches with a standard deviation of4.3 inches and that the average height for a female is 65 inches with a
s
Consider the following histogram.
[4. Determine the shape of the histogram.
[A] Skew left
[B] Symmetric
[C] Skew tight
F
l'
E
I
ll
E
II
I:
use use 23m: 19m:
allele-s
15. Is the mean or the median larger for this data set?
[A] Mean [B] Median
16. Use t
Homework Stat2
The z distribution
A. contains 100% of all scores within -3 and +3 standard
deviations.
B. has a mean of 0 and a standard deviation of 10.
C. is positively skewed.
D. has a mean of 0 and a standard deviation of 1.
7. Which of the following
HW #4
Measures of Center
STA 2023
Name: _
_ 1. Calculate the mean, median and mode of the following data set.
[A]
[B]
[C]
[D]
mean = 4,
mean = 4,
mean = 4,
mean = 4,
median = 3.5,
median = 4,
median = 4,
median = 4,
2,7,3,5,4,3
mode = 3
mode = 3
mode = 7
Homework Stat2
Patient recently diagnosed with Alzheimer's disease takes a cognitve abilities test.
The patient scores a 45 on the test (mean = 52, standard deviation of 5. What is this
patient's percentile rank?
Another patient with Parkinson's disease t
Homework Stat2
What does it mean to standardize a score?
A. Make it so the mean of the scores is 10 and the standard
deviation is 2.
B. Make it so the mean of the distribution is 100 and the standard
deviation is 10.
C. Make it so a given measure can be i
Homework Stat2
C. 7 lbs., 10 oz.
D. 7 lbs., 12 oz.
10. A z-score of 2.3 on a normally distributed measure corresponds to a
percentile rank of
A. .4893
B. 48.93
C. 98.93
D. 1.07
11. If you transform a z-score of 2.35 into a T-score with a mean of 25, what
1. What is the difference between an observational study and an experiment?
In an experiment, a treatment is applied to part of a population and responses are observed. In
an observational study, a researcher measures characteristics of interest of a part
1. Determine whether the variable is qualitative or quantitative. Explain your reasoning.
Distance in miles from one city to another
Is the variable qualitative or quantitative? Explain your reasoning.
The variable is quantitative because distance in mile
1.
How is a sample related to a population?
A sample is a subset of a population.
2. Why is a sample used more often than a population?
It is usually impossible to count the entire population.
3. What is the difference between a parameter and a statistic?